Pondering The Second Law

I glanced through a few posts and comments the other day about creationism and evolution, in which the famous Second Law of Thermodynamics was mentioned several times.  I also know, or it is alleged, that the US Patent Office will not even consider any application if it defies the 2'nd Law in any way -- but maybe that is a legend, I really don't know.  In either case, it got me thinking about the law, and the ideas of laws of physics in general.  What is a law?

I always find a good starting place Wikipedia, that famous repository of seemingly all knowledge of learned minds, yet notorious at the same time because seemingly anyone can change its contents (I've never even tried).  I do know that when it comes to subjects I know something about, I've always found it both agreeable and further educational.  So I looked up the Second Law on it, and found this:  http://en.wikipedia.org/wiki/Second_law_of_thermodynamics

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Second law of thermodynamics

From Wikipedia, the free encyclopedia

   

The second law of thermodynamics states that the entropy of an isolated system never decreases, because isolated systems always evolve toward thermodynamic equilibrium, a state with maximum entropy.

The second law is an empirically validated postulate of thermodynamics. In classical thermodynamics, the second law is a basic postulate defining the concept of thermodynamic entropy, applicable to any system involving measurable heat transfer. In statistical thermodynamics, the second law is a consequence of unitarity in quantum mechanics. In statistical mechanics information entropy is defined from information theory, known as the Shannon entropy. In the language of statistical mechanics, entropy is a measure of the number of alternative microscopic configurations corresponding to a single macroscopic state.

The second law refers to increases in entropy that can be analyzed into two varieties, due to dissipation of energy and due to dispersion of matter. One may consider a compound thermodynamic system that initially has interior walls that restrict transfers within it. The second law refers to events over time after a thermodynamic operation on the system, that allows internal heat transfers, removes or weakens the constraints imposed by its interior walls, and isolates it from the surroundings. As for dissipation of energy, the temperature becomes spatially homogeneous, regardless of the presence or absence of an externally imposed unchanging external force field. As for dispersion of matter, in the absence of an externally imposed force field, the chemical concentrations also become as spatially homogeneous as is allowed by the permeabilities of the interior walls. Such homogeneity is one of the characteristics of the state of internal thermodynamic equilibrium of a thermodynamic system.

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There is more, much more, and please read it all, for it is good.  To begin, it immediately takes us to the concept of entropy, which a measure of disorder in an (isolated, closed) system.

Yet, this has always struck me as bizarre and counter-intuitive.  Why don't we speak of the order in a system, in positive terms?  In science, as in everyday life, we are accustomed to measuring how much of something a thing has, not how much non-something it possesses.  So why isn't entropy the same, a measurement of what's there, not what's lacking?  It's as if we defined matter in terms of the space surrounding it.

The entropy of the cosmos is always increasing, we are also told, as another invocation of the Second Law.  Information content is always decreasing.  Efficiencies are always less than 100%.  We're always losing.  Growing older, and dying.  Death and decay -- what could be a better metaphor for a process that also describes a Carnot Engine?  How do all these ends tie together anyway?

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Yet they do, in a very mathematical, and, yes, intuitive, way.  The mathematics I speak of here is that branch called Probability and Statistics.

Stop.  Don't run and hide for cover.  I'm not a mathematician, or even a physicist.  I'm just a plain old chemist, without even his PhD.  I'm not even going to look anything up, or present any strange looking equations or even charts to use.  I'm going to try to talk about it the same down to earth language that I used in convincing myself of the validity of the Second Law years ago.

Think of a deck of cards.  Better yet, if you have one handy, go grab it.  Riffle through it, in your mind or in your hands (or in your mental hands, if you've got nimble ones).  What do you notice?  First, that all the cards are different -- ah, if this isn't the case, you aren't holding a proper deck.  If it is, do like me and count them.  Fifty-two of them, all spread before you, name and face cards, black and red, tops and bottoms.

Now shuffle them as randomly as you can (if you find this difficult, let your dog or a small child do it for you).  Drop them on the floor, kick them around for a while, then walk about, picking them here and there, at whim, until they're all in your hands again.  The only thing I ask you to do while doing this is to keep the faces (all different) down and the tops (all the same, I think) up.  Pick them all up.  Nudge every corner, every side, every edge, into place, so that the deck is neatly piled.

Now guess the first card.  A protest?  "I've only a one in fifty-two chance of being right,"  you exclaim in dismay.  If you did, that's good, for we're already making progress.  You have some sense of what a probability means.  One in fifty-two is not a very good chance.  You certainly wouldn't bet any money on it (unless you're a compulsive gambler, in which case Chance help you).

Another way of stating your predicament is that you haven't sufficient information to make a good guess.  If you could only know whether it was a red card or a black card, a face card or a number card, or something, anything like this, you could start thinking about your pocketbook before making you guess.  But you know nothing, nothing! Well, except that it has to be one of the fifty-two cards comprising the deck.

Hold on, because I'm going to make things worse.  What if I asked you to guess, not just the first card, but to guess every card in the deck?  If punching me in the mouth isn't your answer, you might just hunker down and wonder how to determine what your chances were of accomplishing such an amazing feat.  How could you do this?

This is where a little mathematics comes in.  Create a mental deck of cards in your head.  Choose the first card at random -- say, seven of spades.  That could have been in any one of fifty-two cards, but you placed it first.  Then the second card -- what is it?  How many remaining cards could you have chosen?  Why, fifty-two minus one, equaling fifty-one.  Now the third card.  Fifty-one minus one, equaling fifty.  And so on, and on, and on, etc., until we come to the last card.

So in the placement of the cards you have 53 X 51 X 50 X ... all the way down to the last card, or X 1.  Mathematicians have a nice way of expressing a product like this:  it's called a factorial, and its represented the "!" symbol.  In this case, it would be fifty-two factorial, or 52!.

It's one thing to state it.  Actually carrying out the calculation, even with a calculator or on your computer, isn't very easy.  Fortunately, all those years ago I already did it, so I will present you with the approximate answer I recall (approximate because my calculator couldn't handle that many digits).  That answer is "8 X 10 E67".  This is another mathematical shorthand, meaning in this case "Eight times ten, where ten is multiplied by itself 67 times over first".  Or, if your prefer, because this is a very, very large number, actually eight followed by sixty-seven zeroes, we can take its based-10 logarithm, around 67.9.  Well, round that off to 68, and you're there as good as not.

A number like that is so large (though it's only a trillionth of the number of atoms in the universe), that you wouldn't bet the tiniest tip of one hair leg of the louse living off the tip of one of your hair legs on it.  It might as well be infinite, as far as you're concerned.  But it's not infinite, not even the even tiniest bit close, all of which brings me back to the subject of thermodynamics.
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Heat, as we all now know thanks to Ludwig Boltzmann, is merely the random motion of atoms.  That motion, thanks to Newton's equations, represent the kinetic energy of the atoms, and with this in mind I am going to attempt a magical transformation:  Imagine, instead of those cards in a deck, the kinetic energies of all the atoms in a given body of matter.  As gas is the simplest state of matter, we'll work with that.  Imagine a hollow magic glass globe, if you like, filled with atoms (or molecules; in this analysis we can treat them the same) of a gas.  And instead of fifty-two cards, consider uncountable trillions upon trillions of different states of kinetic energy among the (otherwise alike) gas atoms.

I want to make this crystal clear.  I am not relating the cards to the individuals atoms, but to the quantity of kinetic energy each particular atom has.  We can even quantize the energy in integer units, from one unit all the way up to -- well, as high as you wish.  If there are a trillion atoms of gas in this globe, then let's say that there are anywhere from one to a trillion energy levels available to each atom.  The precise number doesn't really matter -- I am using trillions here but any number large enough to be unimaginable will do; and there isn't actually any relationship between the number of atoms and number of energy levels.  All of this is just simplification for the purpose of explanation.

Very well.  Consider this glass globe full of gas atoms.  There were two ways we can go about measuring properties of it.  The easiest way is to measure its macroscopic properties.  These are properties such as volume, pressure, temperature, the number of atoms (in conveniently large units like a mole, or almost a trillion times a trillion), the mass, and so on.  They're convenient because we have devices like thermometers, scales, barometers, etc., that we can use to do this.

But there is another way to measure the properties of the gas:  the microscopic way.  In this, we take into account each atom and its quantity of kinetic energy, or some measure of its motion, one by one, and sum the whole thing up.  I'm sure you'll agree that this would be a very tedious, and in practice, absurd and impossible way to make the measurements -- for one thing, even if we could do it at all (a very dubious if, to say the least) it would take nearly forever to get anywhere with any measurement at all.  Fortunately, however, there is a correspondence between these macroscopic and microscopic properties, or states as I shall now call them.  That correspondence is via entropy, or the heart of the Second Law.

Recall the statement from Wiki:  "Entropy is a measure of the number of alternative microscopic configurations corresponding to a single macroscopic state."  That card deck of energy units assigned to each gas atom, like the cards in an actual deck, can be arranged in many, many ways:  about a number whose base ten logarithm is 67.9, recall.  Excuse me, that's for the 52 cards in a deck; for the trillions of possible energy states in a trillion X trillion atoms, that number would be astronomically large; so large that even its logarithm could not be expressed in a format like this, possibly not in any format available in the universe (if anyone can calculate that).  From a microscopic view, the probability of that particular state might as well be zero, for our ability to calculate it.  Like a well-shuffled, deck of cards, there's just no useful information in it.  Another way of saying this, returning to our randomly moving globe of gas atoms, is that there is no way of doing any useful work with it.

That's for a well-shuffled deck of cards / highly randomized energy distribution among atoms.  What about a highly ordered deck or distribution?  First, we have to specify what we mean by "ordered."  For a deck, this might mean ordered by suit (spades, heart, diamond, and club, say), and by value (ace, king, queen, jack, ten ... two), while for our gas it could mean the one atom owns all the units of energies, and all the others none.  I hope you can see that, defined this way, there is only one particular distribution; and once we, either by shuffling the deck or allowing the gas atoms to bump into each other, thereby releasing or gaining units of energy, the distributions become progressively less and less ordered, eventually (though this may take an enormous amount of time) become highly randomized.  The overall macroscopic properties, such as temperature or pressure, don't change, but the ways those properties can be achieved, increase dramatically.  This is why we talk about the " number of alternative microscopic configurations corresponding to a single macroscopic state", or entropy, and why we say that, in the cosmos as a whole, entropy is always increasing.  It is why the ordered state contains a great deal of information and can do a great deal of work, while increasing disorder, or entropy, means less of both.

Now if you've ever worked with decks of cards, you've noticed something quite obvious in retrospect:  you rarely go from perfect order to complete disorder in one shuffle.  There are many, many (also almost innumerable) in-between states of the deck that still have some order in some places with disorder in others.  In fact, even a completely randomized deck will have, by pure chance, some small pockets of order , which can still be exploited as information or for work).  The same is true in nature of course, which is why the Second Law is really a statement of probabilities, not absolutes.  Or, to quote the late Jacob Bronowski in his famous book Ascent of Man:  "It is not true that orderly states constantly run down to disorder.  It is a statistical law, which says that order will tend to vanish.  But statistics do not say 'always'.  Statistics allow order to be built up in some islands of the universe (here on earth, in you, in me, in the stars, in all kinds of places) while disorder takes over in others."

Information, order, the ability for work:  these are always things that a universe has to some degree, however incompletely.  Indeed, by our current understanding of cosmic evolution, our universe started off in a very high state of order, a perhaps highly improbable state of affairs, but quite permissible by the deeply understood laws of thermodynamics.  This initial high degree of order has allowed all the galaxies and stars, and atoms, and of course you an me and all other living things in this universe, to come into existence; and in the same way, will see all these things we regard as precious to us now pass out of existence.  But do not despair.  Order can never run down to absolutely zero; or, from the opposite perspective, disorder, or entropy, can never increase to an infinite however great it becomes; because of this simultaneously subtle but obvious observation, life in some quantity -- organized consciousness in some form is maybe the better word -- doesn't have to completely vanish.  If fact, if the reality really is infinite, as I suspect it is -- consisting of an infinite number of universes in an infinite space-time, all subtly different but all obeying the same fundamental laws of logic -- then we never have to worry about the light of mind being utterly snuffed out everywhere, for all times and places, at any point in any future.  That light has certainly shown long before life on Earth began to organize, and will continue to, somehow, long after our solar system and even entire universe has long burnt out into a heatless cinder.
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What I've put forth here is a necessarily very limited explanation of the Second Law of Thermodynamics, of order, disorder, entropy, information, and work.  There are many more explanations, and whatever you have gained from mine -- I presume more questions than answers -- you should seek deeper comprehension in others' explanations, and in your own mental work on the subject.  There are many topics I've overlooked, or hit upon only in sketchy form, concepts you may need to fully explore and gain clarity in first before grasping the Great Second Law.  If it is any consolation -- assuming you need any -- I am no doubt in much the same situation, perhaps even more so.  If so, I wish you prosperity in your quest for full comprehension, as I have had in my own.  Thank you for attending to these words.

Tidal forces gave moon its shape, according to new analysis

July 30, 2014

By Tim Stephens 

From:  http://news.ucsc.edu/2014/07/moon-shape.html

NASA's Lunar Reconnaissance Orbiter Camera acquired this image of the nearside of the moon in 2010. (Credit: NASA/GSFC/Arizona State University)

The shape of the moon deviates from a simple sphere in ways that scientists have struggled to explain. A new study by researchers at UC Santa Cruz shows that most of the moon's overall shape can be explained by taking into account tidal effects acting early in the moon's history.

The results, published July 30 in Nature, provide insights into the moon's early history, its orbital evolution, and its current orientation in the sky, according to lead author Ian Garrick-Bethell, assistant professor of Earth and planetary sciences at UC Santa Cruz.

As the moon cooled and solidified more than 4 billion years ago, the sculpting effects of tidal and rotational forces became frozen in place. The idea of a frozen tidal-rotational bulge, known as the "fossil bulge" hypothesis, was first described in 1898. "If you imagine spinning a water balloon, it will start to flatten at the poles and bulge at the equator," Garrick-Bethell explained. "On top of that you have tides due to the gravitational pull of the Earth, and that creates sort of a lemon shape with the long axis of the lemon pointing at the Earth."

But this fossil bulge process cannot fully account for the current shape of the moon. In the new paper, Garrick-Bethell and his coauthors incorporated other tidal effects into their analysis. They also took into account the large impact basins that have shaped the moon's topography, and they considered the moon's gravity field together with its topography.

Impact craters

Efforts to analyze the moon's overall shape are complicated by the large basins and craters created by powerful impacts that deformed the lunar crust and ejected large amounts of material. "When we try to analyze the global shape of the moon using spherical harmonics, the craters are like gaps in the data," Garrick-Bethell said. "We did a lot of work to estimate the uncertainties in the analysis that result from those gaps."

Their results indicate that variations in the thickness of the moon's crust caused by tidal heating during its formation can account for most of the moon's large-scale topography, while the remainder is consistent with a frozen tidal-rotational bulge that formed later.

A previous paper by Garrick-Bethell and some of the same coauthors described the effects of tidal stretching and heating of the moon's crust at a time 4.4 billion years ago when the solid outer crust still floated on an ocean of molten rock. Tidal heating would have caused the crust to be thinner at the poles, while the thickest crust would have formed in the regions in line with the Earth. Published in Science in 2010, the earlier study found that the shape of one area of unusual topography on the moon, the lunar farside highlands, was consistent with the effects of tidal heating during the formation of the crust.

"In 2010, we found one area that fits the tidal heating effect, but that study left open the rest of the moon and didn't include the tidal-rotational deformation. In this paper we tried to bring all those considerations together," Garrick-Bethell said.

Tidal heating and tidal-rotational deformation had similar effects on the moon's overall shape, giving it a slight lemon shape with a bulge on the side facing the Earth and another bulge on the opposite side. The two processes left distinct signatures, however, in the moon's gravity field. Because the crust is lighter than the underlying mantle, gravity signals reveal variations in the thickness of the crust that were caused by tidal heating.

Gravity field

Interestingly, the researchers found that the moon's overall gravity field is no longer aligned with the topography, as it would have been when the tidal bulges were frozen into the moon's shape. The principal axis of the moon's overall shape (the long axis of the lemon) is now separated from the gravity principal axis by about 34 degrees. (Excluding the large basins from the data, the difference is still about 30 degrees.)

"The moon that faced us a long time ago has shifted, so we're no longer looking at the primordial face of the moon," Garrick-Bethell said. "Changes in the mass distribution shifted the orientation of the moon. The craters removed some mass, and there were also internal changes, probably related to when the moon became volcanically active."

The details and timing of these processes are still uncertain. But Garrick-Bethell said the new analysis should help efforts to work out the details of the moon's early history. While the new study shows that tidal effects can account for the overall shape of the moon, tidal processes don't explain the topographical differences between the near side and the far side.


In addition to Garrick-Bethell, the coauthors of the paper include Viranga Perera, who worked on the study as a UCSC graduate student and is now at Arizona State University; Francis Nimmo, professor of Earth and planetary sciences at UCSC; and Maria Zuber, a planetary scientist at the Massachusetts Institute of Technology. This work was funded by the Ministry of Education of Korea through the National Research Foundation.

Today's parallels with 1914 are very worrying

Armed conflict is worsening in Gaza, Syria, Ukraine and Iraq, while financial problems in emerging markets are growing

The global financial crisis of 1914 was in some respects even bigger and more internationally all-embracing than its early 21st-century version Photo: GETTY

By Jeremy Warner

6:40AM BST 01 Aug 2014

Original Link:     http://www.telegraph.co.uk/finance/economics/11003506/Todays-parallels-with-1914-are-very-worrying.html

When events escalate, it’s time to worry. Almost everyone will know that the assassination of Archduke Franz Ferdinand in Sarajevo lit the fuse on the First World War – or if they don’t, they’ve not been reading the newspapers, filled as they have been of late with retold accounts to mark the 100th anniversary of the war to end all wars.

Less well known is that the shooting was also the trigger for the first truly global financial crisis of the 20th century, one that in some respects was even bigger and internationally all-embracing than its early 21st-century version. As the clouds of war gathered, financial markets were gripped by panic, closing stock exchanges around the world and forcing governments to bail out and support banks in the same manner as today. In the City, restaurants and shops began refusing coinage and notes. Only gold would do as payment.

When borders closed, many foreign assets became worthless, causing a chain reaction of defaults, banking runs and insolvencies. It scarcely needs saying that the potential for meltdown had been almost wholly unanticipated by money markets and the central banks that oversaw them.

Only a few years previously, the British journalist Norman Angell had argued in his book The Great Illusion that countries had become so economically interdependent and integrated that it made war not just futile but virtually unthinkable.

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Poor Mr Angell has been much misrepresented since as one who was blind to the geopolitical tensions of his age, and their ability to override the assumptions of rational, economic self-interest. In fact, he never actually said that war was impossible, only that no one had anything to gain from it.
None the less, he came to epitomise the misplaced complacency of his age. This was a time of unprecedented international travel and trade, of exchange of ideas and technology. It was entirely reasonable to assume that tribal, national and regional conflict was a thing of the past.

By now, you will have guessed where I am going with this. In some respects, the world as it was just before the Great War bore a remarkable resemblance to our own. Gaza, Ukraine, Iraq and Syria – with the S&P 500 reaching new highs on an almost daily basis, all these crises have been met with a quite astonishing degree of indifference by financial markets.

Even the latest Argentinian default has failed to have any significant effect on this blissful insouciance, though this showed ominous signs of cracking last night amid a serious sell-off in US equities.

With the benefit of hindsight, trigger events for wider geopolitical and economic upheaval are always obvious. It’s easy to see them looking back, not so easy looking forward. Shocking though it was, the assassination of the heir to the Austro-Hungarian throne initially had very little impact. It was not until nations started declaring war, a month after the event, that markets became seriously rattled. Right up until the last moment, investors managed to convince themselves that things would turn out fine in the end.

Much the same point might be made about financial events. The collapse of Lehman’s, a comparatively minor investment bank, prompted the worst financial and economic crisis since the Great Depression. Few if any anticipated the scale of its impact. Similarly, the cascading series of banking collapses that marked the start of the Great Depression began with the failure of Creditanstalt, an Austrian bank that scarcely anyone had heard of at the time.

Looking at today’s events, a similar complacency afflicts investors and commentators as they weigh the carnage of the Middle East and the disgusting expansionism of Vladimir Putin’s Russia. I’ve lost count of the number of City reports I’ve read explaining why today’s geopolitical events don’t matter for financial markets.

These are considered small wars in faraway places, of no relevance – beyond the constant pounding of the 24-hour news agenda – for the economic powerhouses of the West. No major player in the global financial system, it is reasonably postulated, would be quite so stupid as to go to war over them. Well perhaps, but just consider the way events have already escalated. The murder of three Israeli teenagers – a shocking but tiny atrocity by the standards of the region – has led to the invasion of Gaza. Few could doubt, post this response, that Israel would also strike at Iran if Tehran gets any closer to arming itself with nuclear weapons.

Consider also the escalation of events in Ukraine, and the economically perilous ratcheting up of sanctions in retaliation. For a Europe still struggling to extract itself from the ravages of the financial crisis, these developments could hardly have come at a worse time.

All this might not matter so much if it were against the backdrop of a generally stable world economy. But very few would describe it as such. Pregnant with record amounts of debt – emerging markets are now piling it on with the same reckless abandon as the West – and highly reliant on the steroids of artificial monetary support, financial markets have rarely looked more vulnerable to unexpected shocks. I don’t want to over-egg the point, but the parallels with the calm before the storm of 100 years ago are impossible to ignore.

Are there emotional no-go areas where logic dare not show its face?

Jul 30, 2014

Original Link  https://richarddawkins.net/2014/07/are-there-emotional-no-go-areas-where-logic-dare-not-show-its-face/

by Richard Dawkins

Are there kingdoms of emotion where logic is taboo, dare not show its face, zones where reason is too intimidated to speak?

Moral philosophers make full use of the technique of thought experiment. In a hospital there are four dying men. Each could be saved by a transplant of a different organ, but no donors are available. In the hospital waiting room is a healthy man who, if we killed him, could provide the requisite organ to each dying patient, thereby saving four lives for the price of one. Is it morally right to kill the healthy man and harvest his organs?

Everyone says no, but the moral philosopher wants to discuss the question further. Why is it wrong? Is it because of Kant’s Principle: “Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the same time as an end.” How do we justify Kant’s principle? Are there ever exceptions? Could we imagine a hypothetical scenario in which . . .

What if the dying men were Beethoven, Shakespeare, Einstein and Martin Luther King? Would it be then right to sacrifice a man who is homeless and friendless, dragged in from a ditch? And so on.
Two miners are trapped underground by an explosion. They could be saved, but it would cost a million dollars. That million could be spent on saving the lives of thousands of starving people.
Could it ever be morally right to abandon the miners to their fate and spend the money on saving the thousands? Most of us would say no. Would you? Or do you think it is wrong even to raise such questions?

These dilemmas are uncomfortable. It is the business of moral philosophers to face up to the discomfort and teach their students to do the same. A friend, a professor of moral philosophy, told me he received hate-mail when he raised the hypothetical case of the miners. He also told me there are certain thought experiments that divide his students down the middle. Some students are capable of temporarily accepting a noxious hypothetical, to explore where it might lead. Others are so blinded by emotion that they cannot even contemplate the hypothetical. They simply stop up their ears and refuse to join the discussion.

“We all agree it isn’t true that some human races are genetically superior to others in intelligence. But let’s for a moment suspend disbelief and consider the consequences if it were true. Would it ever be right to discriminate in job hiring? Etcetera.” My friend sometimes poses this very question, and he tells me that about half the students are willing to entertain the hypothetical counterfactual and rationally discuss the consequences. The other half respond emotionally to the hypothetical, are too revolted to proceed and simply opt out of the conversation.

Could eugenics ever be justified? Could torture? A clock triggering a gigantic nuclear weapon hidden in a suitcase is ticking. A spy has been captured who knows where it is and how to disable it, but he refuses to speak. Is it morally right to torture him, or even his innocent children, to make him reveal the secret? What if the weapon were a doomsday machine that would blow up the whole world?

There are those whose love of reason allows them to enter such disagreeable hypothetical worlds and see where the discussion might lead. And there are those whose emotions prevent them from going anywhere near the conversation. Some of these will vilify and hurl vicious insults at anybody who is prepared to discuss such matters. Some will pursue active witch-hunts against moral philosophers for daring to consider obnoxious hypothetical thought experiments.

“A woman has an absolute right to do what she wants with her own body and that includes any foetus that it might contain. I don’t care if the foetus is fully conscious and writing poetry in the womb, the woman still has the right to abort it because it is her body and her choice.” Do we discuss the hypothetical intra-uterine poet, or does emotion simply close down the discussion, in either direction?
Do we think the woman’s right is absolute, absolute, absolute – end of? Or do we think abortion is wrong, wrong, wrong; abortion is murder, no further discussion.?

“We agree that cannibalism is wrong. But if we don’t need to kill someone in order to eat them, can we discuss why it would be wrong? Why don’t we eat human road-kills? Yes, it would be horrible for the friends and relatives of the dead person, but suppose we hypothetically know that this person has no friends or relatives of any kind, why wouldn’t we eat him? Or is there a slippery slope that we should consider?” Do we proceed to discuss such questions rationally and logically with the professor of moral philosophy? Or do we throw an emotional fit and run screaming from the room?

I believe that, as non-religious rationalists, we should be prepared to discuss such questions using logic and reason. We shouldn’t compel people to enter into painful hypothetical discussions, but nor should we conduct witch-hunts against people who are prepared to do so. I fear that some of us may be erecting taboo zones, where emotion is king and where reason is not admitted; where reason, in some cases, is actively intimidated and dare not show its face. And I regret this. We get enough of that from the religious faithful. Wouldn’t it be a pity if we became seduced by a different sort of sacred, the sacred of the emotional taboo zone?

Moving from the hypothetical to the real, if you raise the question of female genital mutilation, you can guarantee that about half the responses you get will be of the form “What about male circumcision?” and this often seems calculated to derail the campaign against FGM and take the steam out of it. If you try and say “Yes yes, male infant circumcision may be bad but FGM is worse”, you will be stopped in your tracks. Both are violations of a defenceless child, you cannot discuss whether one is worse than the other. How dare you even think about ranking them?

When a show-business personality is convicted of pedophilia, is it right that you actually need courage to say something like this: “Did he penetratively rape children or did he just touch them with his hands? The latter is bad but I think the former is worse”? How dare you rank different kinds of pedophilia? They are all equally bad, equally terrible. What are you, some kind of closet pedophile yourself?

I have met the following reaction when discussing the vexed and terrible question of Israel/Palestine. Israeli friends have said to me things like, “We needed a Jewish state because, after the Holocaust, we realised that nobody else was going to look after us, we’d have to look after ourselves. Jews have been downtrodden for too long. From now on, we Jews are going to stand tall and take care of ourselves.” To which, on one occasion, I replied, “Yes, of course I sympathise with that, but can you explain why Palestinian Arabs should be the ones to pay for Hitler’s crimes? Why Palestine? You surely aren’t going to stoop to some kind of biblical justification for picking on that land rather than, say, Bavaria or Madagascar?” My friend earnestly said, “Richard, I think we had better just terminate this conversation.” I had blundered into another taboo zone, a sacred emotional sanctuary where discussion is forbidden. The emotions aroused by the Holocaust are so painful that we are not allowed even to discuss such questions. A friend will terminate the conversation rather than allow entry to the sanctuary of hurt emotion.

On Twitter during the current horrible events in Gaza, I wrote the following:
“The extent of the destruction in Gaza is obscene. Poor people. Poor people who have lost their homes, their relatives, everything.” I was immediately bitterly attacked by friends of Israel. But then I quoted Sam Harris to the effect that “Hamas publicly says they’d like to kill every Jew in the world” and I went on to raise Sam’s hypothetical question: What does that say about Hamas’s probable actions if positions were reversed and they had Israel’s military strength? Sam’s suggestion that this contrast might actually be demonstrating restraint on Israel’s part, unleashed a storm of furious accusations that he, and I, relished the bombing of Gaza’s children.

I also quoted Sam as saying “I don’t think Israel should exist as a Jewish state.” So of course I, and Sam, got vituperative brickbats from Israel and from American Jewish interests. I summed up my position on the fence (linking to an interview with Christopher Hitchens) as follows: “It is reasonable to deplore both the original founding of the Jewish State of Israel & aspirations now to destroy it.”
But I swiftly learned that emotion can be so powerful that reasonable discussion – looking at both sides of the question dispassionately – becomes impossible.

Apparently I didn’t learn swiftly enough – and I now turn to the other Twitter controversy in which I have been involved this week.

‘“Being raped by a stranger is bad. Being raped by a formerly trusted friend is worse.” If you think that hypothetical quotation is an endorsement of rape by strangers, go away and learn how to think.’

That was one way I put the hypothetical. It seemed to me entirely reasonable that the loss of trust, the disillusionment that a woman might feel if raped by a man whom she had thought to be a friend, might be even more horrible than violation by a stranger. I had previously put the opposite hypothetical, but drew an equivalent logical conclusion:

“Date rape is bad. Stranger rape at knifepoint is worse. If you think that’s an endorsement of date rape, go away and learn how to think.”

These two opposite hypothetical statements were both versions of the general case, which I also tweeted:

“X is bad. Y is worse. If you think that’s an endorsement of X, go away and don’t come back until you’ve learned how to think properly.”

The point was a purely logical one: to judge something bad and something else very bad is not an endorsement of the lesser of two evils. Both are bad. I wasn’t making a point about which of the two was worse. I was merely asserting that to express an opinion one way or the other is not tantamount to approving the lesser evil.

Some people angrily failed to understand that it was a point of logic using a hypothetical quotation about rape. They thought it was an active judgment about which kind of rape was worse than which.
Other people got the point of logic but attacked me, equally furiously, for choosing the emotionally loaded example of rape to illustrate it. To quote one blogger, prominent in the atheist movement, ‘What would have been wrong with, “Slapping someone’s face is bad, breaking their nose is worse”? Why need to use rape?’

Yes, I could have used the broken nose example. I accept that I must explain why I chose to use the particular example of rape. I was emphatically not trying to hurt rape victims or trivialise their awful experience. They get enough of that already from the “She was wearing a short skirt, I bet she was really begging for it Hur Hur Hur” brigade. So why did I choose rape as my unpleasant hypothetical (in both directions) rather than the “breaking someone’s nose” example? Here’s why.

I hope I have said enough above to justify my belief that rationalists like us should be free to follow moral philosophic questions without emotion swooping in to cut off all discussion, however hypothetical. I’ve listed cannibalism, trapped miners, transplant donors, aborted poets, circumcision, Israel and Palestine, all examples of no-go zones, taboo areas where reason may fear to tread because emotion is king. Broken noses are not in that taboo zone. Rape is. So is pedophilia. They should not be, in my opinion. Nor should anything else.

I didn’t know quite how deeply those two sensitive issues had infiltrated the taboo zone. I know now, with a vengeance. I really do care passionately about reason and logic. I think dispassionate logic and reason should not be banned from entering into discussion of cannibalism or trapped miners. And I was distressed to see that rape and pedophilia were also becoming taboo zones; no-go areas, off limits to reason and logic.

“Rape is rape is rape.” You cannot discuss whether one kind of rape (say by a ‘friend”) is worse than another kind of rape (say by a stranger). Rape is rape and you are not allowed even to contemplate the question of whether some rape is bad but other rape is worse. I don’t want to listen to this horrible discussion. The very idea of classifying some rapes as worse than others, whether it’s date rape or stranger rape, is unconscionable, unbearable, intolerable, beyond the pale, taboo. There is no allowable distinction between one kind of rape and another.

If that were really right, judges shouldn’t be allowed to impose harsher sentences for some rapes than for others. Do we really want our courts to impose a single mandatory sentence – a life sentence, perhaps – for all rapes regardless? To all rapes, from getting a woman drunk and taking advantage at one end of the spectrum, to holding a knife to her throat in a dark alley at the other? Do we really want our judges to ignore such distinctions when they pass sentence? I don’t, and I don’t think any reasonable person would if they thought it through. And yet that would seem to be the message of the agonisingly passionate tweets that I have been reading. The message seems to be, no, there is no spectrum, you are wicked, evil, a monster, to even ask whether there might be a spectrum.

I don’t think rationalists and sceptics should have taboo zones into which our reason, our logic, must not trespass. Hypothetical cannibalism of human road kills should be up for discussion (and rejection in my opinion – but let’s discuss it). Same for eugenics. Same for circumcision and FGM. And the question of whether there is a spectrum of rapes, from bad to worse to very very much worse, should also be up for discussion, no less than the spectrum from a slap in the face to a broken nose.

There would have been no point in my using the broken nose example to illustrate my logic, because nobody would ever accuse us of endorsing face-slapping when we say, “Broken nose is worse than slap in face”. The point is trivially obvious, as it is with the symbolic case of “X is worse than Y”. But I knew that not everybody would think it obvious in the special cases of rape and pedophilia, and that was precisely why I raised them for discussion. I didn’t care whether we chose to say date rape was worse than dark alley stranger rape, or vice versa. Nor was I unaware that it is a sensitive issue, as is pedophilia. I deliberately wanted to challenge the taboo against rational discussion of sensitive issues.

That, then, is why I chose rape and pedophilia for my hypothetical examples. I think rationalists should be free to discuss spectrums of nastiness, even if only to reject them. I had noticed indications that rape and pedophilia had moved out of the discussion zone into a no-go taboo area. I wanted to challenge the taboo, just as I want to challenge all taboos against free discussion.

Nothing should be off limits to discussion. No, let me amend that. If you think some things should be off limits, let’s sit down together and discuss that proposition itself. Let’s not just insult each other and cut off all discussion because we rationalists have somehow wandered into a land where emotion is king.

It is utterly deplorable that there are people, including in our atheist community, who suffer rape threats because of things they have said. And it is also deplorable that there are many people in the same atheist community who are literally afraid to think and speak freely, afraid to raise even hypothetical questions such as those I have mentioned in this article. They are afraid – and I promise you I am not exaggerating – of witch-hunts: hunts for latter day blasphemers by latter day Inquisitions and latter day incarnations of Orwell’s Thought Police.

AAAS Board of Directors: Legally Mandating GM Food Labels Could “Mislead and Falsely Alarm Consumers”

25 October 2012

Ginger Pinholster

 

Original Link:  http://www.aaas.org/news/aaas-board-directors-legally-mandating-gm-food-labels-could-%E2%80%9Cmislead-and-falsely-alarm

Foods containing ingredients from genetically modified (GM) crops pose no greater risk than the same foods made from crops modified by conventional plant breeding techniques, the AAAS Board of Directors has concluded. Legally mandating labels on GM foods could therefore “mislead and falsely alarm consumers,” the Board said in a statement approved 20 October.

In releasing the Board’s statement, AAAS noted that it is important to distinguish between labeling intended to protect public health—about the presence of allergens, for example—and optional labeling that aids consumer decision-making, such as “kosher” or “USDA organic,” which reflects verifiable and certifiable standards about production and handling.

Several current efforts to require labeling of GM foods are not being driven by any credible scientific evidence that these foods are dangerous, AAAS said. Rather, GM labeling initiatives are being advanced by “the persistent perception that such foods are somehow ‘unnatural,’” as well as efforts to gain competitive advantages within the marketplace, and the false belief that GM crops are untested.
In the United States, in fact, each new GM crop must be subjected to rigorous analysis and testing in order to receive regulatory approval, AAAS noted. It must be shown to be the same as the parent crop from which it was derived and if a new protein trait has been added, the protein must be shown to be neither toxic nor allergenic. “As a result and contrary to popular misconceptions,” AAAS reported, “GM crops are the most extensively tested crops ever.”

Moreover, the AAAS Board said, the World Health Organization, the American Medical Association, the U.S. National Academy of Sciences, the British Royal Society, and “every other respected organization that has examined the evidence has come to the same conclusion: consuming foods containing ingredients derived from GM crops is no riskier than consuming the same foods containing ingredients from crop plants modified by conventional plant improvement techniques.”

The European Commission (EU) recently concluded, based on more than 130 studies covering 25 years of research involving at least 500 independent research groups, that genetic modification technologies “are not per se more risky than…conventional plant breeding technologies.” Occasional claims that feeding GM foods to animals can cause health problems have not stood up to rigorous scientific scrutiny, AAAS said.

“Civilization rests on people’s ability to modify plants to make them more suitable as food, feed and fiber plants and all of these modifications are genetic,” the AAAS Board concluded. “Modern molecular genetics and the invention of large-scale DNA sequencing methods have fueled rapid advances in our knowledge of how genes work and what they do, permitting the development of new methods that allow the very precise addition of useful traits to crops, such as the ability to resist an insect pest or a viral disease, much as immunizations protect people from disease.”

Read the full statement by the AAAS Board of Directors on labeling of genetically modified foods.

Biologist warn of early stages of Earth’s sixth mass extinction event

 

Jul 31, 2014

Original Link:  https://richarddawkins.net/2014/07/biologist-warn-of-early-stages-of-earths-sixth-mass-extinction-event/              

 

By ScienceDaily

The planet’s current biodiversity, the product of 3.5 billion years of evolutionary trial and error, is the highest in the history of life. But it may be reaching a tipping point.

In a new review of scientific literature and analysis of data published in Science, an international team of scientists cautions that the loss and decline of animals is contributing to what appears to be the early days of the planet’s sixth mass biological extinction event.

Since 1500, more than 320 terrestrial vertebrates have become extinct. Populations of the remaining species show a 25 percent average decline in abundance. The situation is similarly dire for invertebrate animal life.

And while previous extinctions have been driven by natural planetary transformations or catastrophic asteroid strikes, the current die-off can be associated to human activity, a situation that the lead author Rodolfo Dirzo, a professor of biology at Stanford, designates an era of “Anthropocene defaunation.”

Across vertebrates, 16 to 33 percent of all species are estimated to be globally threatened or endangered. Large animals — described as megafauna and including elephants, rhinoceroses, polar bears and countless other species worldwide — face the highest rate of decline, a trend that matches previous extinction events.

Larger animals tend to have lower population growth rates and produce fewer offspring. They need larger habitat areas to maintain viable populations. Their size and meat mass make them easier and more attractive hunting targets for humans.

Although these species represent a relatively low percentage of the animals at risk, their loss would have trickle-down effects that could shake the stability of other species and, in some cases, even human health.

For instance, previous experiments conducted in Kenya have isolated patches of land from megafauna such as zebras, giraffes and elephants, and observed how an ecosystem reacts to the removal of its largest species. Rather quickly, these areas become overwhelmed with rodents. Grass and shrubs increase and the rate of soil compaction decreases. Seeds and shelter become more easily available, and the risk of predation drops.

Study traces dinosaur evolution into early birds

By SETH BORENSTEIN 17 hours ago

0 shares

Original Link:  http://news.yahoo.com/study-traces-dinosaur-evolution-early-birds-180059316.html?soc_src=mediacontentstory

 

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This undated artist rendering provided by the journal Science shows the

dinosaur lineage which evolved into birds …

 

 

 

WASHINGTON (AP) — Scientists have mapped how a group of fearsome, massive dinosaurs evolved and shrank to the likes of robins and hummingbirds.
Comparing fossils of 120 different species and 1,500 skeletal features, especially thigh bones, researchers constructed a detailed family tree for the class of two-legged meat-eaters called theropods. That suborder of dinos survives to this day as birds, however unrecognizable and improbable it sounds.

The steady downsizing and elegant evolution of the theropods is detailed in the journal Science on Thursday.

"They just kept on shrinking and shrinking and shrinking for about 50 million years," said study author Michael S. Y. Lee of the University of Adelaide in Australia. He called them "shape-shifters."

Lee and colleagues created a dinosaur version of the iconic ape-to-man drawing of human evolution. In this version, the lumbering large dinos shrink, getting more feathery and big-chested, until they are the earliest version of birds.

 

For a couple decades scientists have linked birds to this family of dinosaurs because they shared hollow bones, wishbones, feathers and other characteristics. But the Lee study gives the best picture of how steady and unusual theropod evolution was. The skeletons of theropods changed four times faster than other types of dinosaurs, the study said.

 

A few members of that dino family did not shrink, including T. rex, which is more of a distant cousin to birds than a direct ancestor, Lee said.

He said he and colleagues were surprised by just how consistently the theropods shrank over evolutionary time, while other types of dinosaurs showed ups and downs in body size.

The first theropods were large, weighing around 600 pounds. They roamed about 220 million to 230 million years ago. Then about 200 million years ago, when some of the creatures weighed about 360 pounds, the shrinking became faster and more prolonged, the study said. In just 25 million years, the beasts were slimmed down to barely 100 pounds. By 167 million years ago, 6-pound paravians, more direct ancestor of birds, were around.

 

And 163 million years ago the first birds, weighing less than two pounds, probably came on the scene, the study said

 

Paul Sereno, a dinosaur researcher at the University of Chicago who wasn't part of this study, praised Lee's work as innovative.

The steady size reduction shows "something very strange going on," Sereno said. "This is key to what went on at the origin of birds."

People may think bigger is better, but sometimes when it comes to evolution smaller can be better because bigger creatures are more likely to go extinct, Sereno said.

And when the theropods started shrinking there weren't many other small species that would compete with them, Lee said.

"The dinosaur ancestors of birds found a new niche and a new way of life," Lee said.

Sereno added, "When you are small, it's a totally different ball game. You can fly and glide and I think that's what drove it."

 

Online:  The journal Science: http://www.sciencemag.org

Seth Borenstein can be followed at http://twitter.com/borenbears

Scientists Finally Admit There Is a Second, Secret DNA Code Which Controls Genes

The Mind Unleashed

on 24 January, 2014 at 09:16

Original Link:  http://themindunleashed.org/2014/01/scientists-finally-admit-second-secret-dna-code-controls-genes.html

 

 

The fascinating and recent discovery of a new, second DNA code further lends credence to what metaphysical scientists have been saying for millennia — the body speaks two different languages.

Since the genetic code was deciphered in the 1960s, researchers have assumed that it was used exclusively to write information about proteins.

 

But biologists have suspected for years that some kind of epigenetic inheritance occurs at the cellular level. The different kinds of cells in our bodies provide an example. Skin cells and brain cells have different forms and functions, despite having exactly the same DNA.

No Such Thing As Junk DNA

The human genome is packed with at least four million gene switches that reside in bits of DNA that once were dismissed as “junk” but it turns out that so-called junk DNA plays critical roles in controlling how cells, organs and other tissues behave. The discovery, considered a major medical and scientific breakthrough, has enormous implications for human health and consciousness because many complex diseases appear to be caused by tiny changes in hundreds of gene switches.

As scientists delved into the “junk” — parts of the DNA that are not actual genes containing instructions for proteins — they discovered a complex system that controls genes. At least 80 percent of this DNA is active and needed. Another 15-17 percent has higher functions scientists are still decoding.

 

Recent findings in the journal Science may have big implications for how medical experts use the genomes of patients to interpret and diagnose diseases, researchers said.

 

The genetic code uses a 64-letter alphabet called codons. Dr Stamatoyannopoulos with co-authors were stunned to discover that some codons, which they called duons, can have two meanings. One describes how proteins are made, and the other instructs the cell on how genes are controlled.

The newfound genetic code within deoxyribonucleic acid, the hereditary material that exists in nearly every cell of the body, was written right on top of the DNA code scientists had already cracked.

Controls Genes

Rather than concerning itself with proteins, this one instructs the cells on how genes are controlled.

Its discovery means DNA changes, or mutations that come with age or in response to vibrational changes within the DNA, may be doing more than what scientists previously thought.

 

“For over 40 years we have assumed that DNA changes affecting the genetic code solely impact how proteins are made,” said lead author John Stamatoyannopoulos, University of Washington associate professor of genome sciences and of medicine.

“Now we know that this basic assumption about reading the human genome missed half of the picture,” he said.

 

“Many DNA changes that appear to alter protein sequences may actually cause disease by disrupting gene control programs or even both mechanisms simultaneously.”

These two meanings seem to have evolved in concert with each other. The gene control instructions appear to help stabilize certain beneficial features of proteins and how they are made.

The discovery was made as part of the international collaboration of research groups known as the Encyclopedia of DNA Elements Project, or ENCODE.

DNA Responds To Frequency

The Russian biophysicist and molecular biologist Pjotr Garjajev and his colleagues explored the vibrational behavior of the DNA. The bottom line was: “Living chromosomes function just like solitonic/holographic computers using the endogenous DNA laser radiation.” This means that they managed for example to modulate certain frequency patterns onto a laser ray and with it influenced the DNA frequency and thus the genetic information itself. Since the basic structure of DNA-alkaline pairs and of language (as explained earlier) are of the same structure, no DNA decoding is necessary.
This finally and scientifically explains why affirmations, autogenous training, hypnosis and the like can have such strong effects on humans and their bodies. It is entirely normal and natural for our DNA to react to frequency. While western researchers cut single genes from the DNA strands and insert them elsewhere, the Russians enthusiastically worked on devices that can influence the cellular metabolism through suitable modulated radio and light frequencies and thus repair genetic defects.

Garjajev’s research group succeeded in proving that with this method chromosomes damaged by x-rays for example can be repaired. Garjajev’s research group They even captured information patterns of a particular DNA and transmitted it onto another, thus reprogramming cells to another genome. So they successfully transformed, for example, frog embryos to salamander embryos simply by transmitting the DNA information patterns! This way the entire information was transmitted without any of the side effects or disharmonies encountered when cutting out and re-introducing single genes from the DNA. This represents an unbelievable, world-transforming revolution and sensation! All this by simply applying vibration instead of the archaic cutting-out procedure! This experiment points to the immense power of wave genetics, which obviously has a greater influence on the formation of organisms than the biochemical processes of alkaline sequences.

Sources: 
washington.edu
preventdisease.com
sciencemag.org

Author: Michael Forrester is a spiritual counselor and is a practicing motivational speaker for corporations in Japan, Canada and the United States.

Credits: Michael Forrester, PreventDisease, Guest contributor. 

Open Source ‘Solar Pocket Factory’ Can 3D Print A Solar Panel Every 15 Seconds

The Mind Unleashed

on 1 August, 2014 at 00:03

Original Link:  http://themindunleashed.org/2014/08/open-source-solar-pocket-factory-can-3d-print-solar-panel-every-15-seconds.html

 

Shawn Frayne and Alex Hornstein, two young inventors based in the Philippines, are taking their passion for clean free energy and developing a way to make it accessible and cheap for everyone. These guys are working restlessly to provide a product that could be used by practically anyone to make homemade solar panels.

 

The factory is small enough to fit on a desktop and efficient enough to produce 300k to one million panels per year, up to one every 15 seconds. By cutting out much of the labor intensive process, which represents 50% of the total cost, this machine can dramatically reduce the price of solar. Their pocket solar panel producer can change the way the world views electricity.

What type of applications can a homemade solar panel have? For starters it can replace the need for outlets in a home for smaller electronics such as phones, computers, lamps, etc.

One of the more intriguing applications is the added versatility solar panels can provide. In short, with these panels you can use your electronics anywhere there’s sunshine .

Their initial Kickstarter campaign was quickly fully funded, but they are raising additional funds to redesign the CNC laser cutter with the intentions to open source the technology. Eventually they plan to power the solar panel maker using solar panels.

The product is continuously being improved and the technology is open source which makes it free for anyone to copy or improve upon.

Other grass-roots inventors, such as Ma Yehe — who invented a 3D printer to build houses – are beginning to emerge in hopes of improving the world. These are the type of inventors that are going to drive innovation and technology into the new age. Corrupt, politicized and controlled global marketplaces cannot suppress innovation anymore. The future is promising with the budding new wave of inventors with actual intentions to improve mankind with open source technology and ideas. Check out the video below and the Solar Pocket Factory website for more info.

Here’s their first working model in action:

Credits: www.livefreelivenatural.com

New source of hydroxyl radicals found in the clouds

31 July 2014

By:  Caryl Richards    

Original Link:  http://www.rsc.org/chemistryworld/2014/07/new-source-hydroxyl-radicals-found-clouds

© Shutterstock

 

An international collaboration of scientists has discovered a previously unidentified source of tropospheric hydroxyl radicals generated by the interaction of ozone with the surface of clouds. Their simulations predict that the rate of hydroxyl radical production at the clouds’ air–water interface could be four orders of magnitude higher than in the rest of the atmosphere.

‘This is an important finding because the hydroxyl radical is the main “cleaner” of the atmosphere, and all the sources and sinks of this radical, which are gas phase, play a key role in the chemistry of the atmosphere,’ explains team member Josep Anglada, from the Institute of Advanced Chemistry of Catalonia, Spain.

 

While better known as the atmospheric trace gas that protects us from much of the solar UV radiation, ozone is also an important source of hydroxyl radicals in the troposphere owing to photodissociation. Nonetheless, according to Anglada, even though many atmospheric species are adsorbed at the air–water interface, up until now the chemistry at the interface has often been overlooked.

 

Applying quantum mechanics and molecular mechanics method first used to study biochemical reaction pathways, the team simulated the effects of water on the spectroscopic signature and dissociation rate constant of ozone adsorbed at the cloud surface. Crucially, they predicted that ozone exhibits a strong affinity for the air–water interface. ‘Our results suggest that the ozone adsorption process is thermodynamically spontaneous,’ Anglada says. ‘The predicted frequency shifts and enlargements of the spectral bands reveal that the photodissociation of ozone is strongly favoured by its interaction with water.’

 

‘This is exciting work linking together two of the new trends in atmospheric chemistry, multiphase chemistry and quantum calculations,’ says Mathew Evans at the University of York, UK, where he uses models to better predict the composition of the atmosphere. ‘We usually think about clouds as sinks for radicals, whereas this work suggests we should potentially start looking at them as sources.’

 

According to Dwayne Heard, an atmospheric chemist at the University of Leeds, UK, this is important since hydroxyl radicals are the dominant daytime oxidising species of greenhouse gases, such as methane, whose levels are continuing to rise. ‘More hydroxyl radicals means a globally shorter methane lifetime,’ he says, but concedes ‘the impact will depend on whether the radicals can escape the interface region to the gas phase, where it can oxidise trace gases, or remain trapped at the surface’.

 

Evans agrees. ‘These are theoretical calculations and they need to be assessed in both the lab and in the field but they highlight how the chemistry of the atmosphere can still surprise us.’

References

J M Anglada et al, Proc. Natl. Acad. Sci. USA, 2014, DOI: 10.1073/pnas.1411727111

Is our universe a bubble in the multiverse?

Is our universe a bubble in the multiverse?

July 21, 2014

From:  http://www.kurzweilai.net/is-our-universe-a-bubble-in-the-multiverse

Screenshot from a video of Matthew Johnson explaining the multiverse hypothesis (credit: Perimeter Institute)

Researchers at the Perimeter Institute for Theoretical Physics are working to bring the multiverse hypothesis — we are living in one universe of many — into the realm of testable science.
Perimeter Associate Faculty member Matthew Johnson and his team are looking for clues for the existence of multiverses (a.ka. parallel universes) in the cosmic microwave background data, assumed to be left over from the Big Bang.

To do that, “we simulate the whole universe,” he says, but only on the largest scales. “We start with a multiverse that has two bubbles in it, we collide the bubbles on a computer to figure out what happens, and then we stick a virtual observer in various places and ask what that observer would see from there.”

For example, if another universe had collided with ours in the early universe, it would have left evidence in the form of a  “a disk on the sky,” creating a “bruise” in the pattern, he says. That the search for such a disk has so far come up empty makes certain collision-filled models less likely.

Hypothesized disks in the cosmic microwave background (CMB) from the early universe, indicating that another bubble universe had collided with our universe (credit: Perimeter Institute)

Meanwhile, the team is at work figuring out what other kinds of evidence a bubble collision might leave behind. It’s the first time, the team writes in their paper, that anyone has produced a direct quantitative set of predictions for the observable signatures of bubble collisions. And though none of those signatures has so far been found, some of them are possible to look for.

The real significance of this work is as a proof of principle: it shows that the multiverse can be testable. In other words, if we are living in a bubble universe, we might actually be able to tell.

Perimeter Institute | Perimeter Associate Faculty member Matthew Johnson explains
the related concepts of inflation, eternal inflation, and the multiverse.

---

Abstract of Journal of Cosmology and Astroparticle Physics paper
The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expanding false vacuum. The collision of our bubble with another could provide an important observational signature to test this scenario. We develop and implement an algorithm for accurately computing the cosmological observables arising from bubble collisions directly from the Lagrangian of a single scalar field. We first simulate the collision spacetime by solving Einstein’s equations, starting from nucleation and ending at reheating. Taking advantage of the collision’s hyperbolic symmetry, the simulations are performed with a 1+1-dimensional fully relativistic code that uses adaptive mesh refinement. We then calculate the comoving curvature perturbation in an open Friedmann-Robertson-Walker universe, which is used to determine the temperature anisotropies of the cosmic microwave background radiation. For a fiducial Lagrangian, the anisotropies are well described by a power law in the cosine of the angular distance from the center of the collision signature. For a given form of the Lagrangian, the resulting observational predictions are inherently statistical due to stochastic elements of the bubble nucleation process. Further uncertainties arise due to our imperfect knowledge about inflationary and pre-recombination physics. We characterize observational predictions by computing the probability distributions over four phenomenological parameters which capture these intrinsic and model uncertainties. This represents the first fully-relativistic set of predictions from an ensemble of scalar field models giving rise to eternal inflation, yielding significant differences from previous non-relativistic approximations. Thus, our results provide a basis for a rigorous confrontation of these theories with cosmological data.

References:

• Carroll L. Wainwright et al., Simulating the universe(s): from cosmic bubble collisions to cosmological observables with numerical relativity, Journal of Cosmology and Astroparticle Physics, 2014, doi:10.1088/1475-7516/2014/03/030

World first: Australian solar plant has generated “supercritical” steam that rivals fossil fuels’

World first: Australian solar plant has generated “supercritical” steam that rivals fossil fuels’

 

ScienceAlert Staff

Original Link:  http://pda.sciencealert.com.au/news/20140506-25618.html 

 

Thursday, 05 June 2014

A CSIRO test plant in Australia has broken a world record and proved solar power could efficiently replace fossil fuels.

Image: CSIRO

 

A solar thermal test plant in Newcastle, Australia, has generated “supercritical” steam at a pressure of 23.5 MPa (3400 psi) and 570°C (1,058°F).

CSIRO is claiming it as a world record, and it’s a HUGE step for solar thermal energy.
"It's like breaking the sound barrier; this step change proves solar has the potential to compete with the peak performance capabilities of fossil fuel sources," Dr Alex Wonhas, CSIRO’s Energy Director, told Colin Jeffrey for Gizmag.

The Energy Centre uses a field of more than 600 mirrors (known as heliostats) which are all directed at two towers housing solar receivers and turbines, Gizmag reports.
This supercritical steam is used to drive the world’s most advanced power plant turbines, but previously it’s only been possible to produce it by burning fossil fuels such as coal or gas.

"Instead of relying on burning fossil fuels to produce supercritical steam, this breakthrough demonstrates that the power plants of the future could instead be using the free, zero emission energy of the sun to achieve the same result,” Dr Wonhas explained.

Image: CSIRO

Currently, commercial solar thermal or concentrating solar power power plants only operate a “subcritical” levels, using less pressurised steam. This means that they’ve never been able to match the output or efficiency of the world’s best fossil fuel power plants - until now.

The commercial development of this technology is still a fair way off, but this is an important first step towards a more sustainable future.

Watch the video to see the plant in action.
https://www.youtube.com/watch?feature=player_embedded&v=RAqd1MuoLo8