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Planetary boundaries

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  • Wiki
    From Wikipedia, the free encyclopedia Ward Cunningham , inventor of the wiki   A wiki is a website on whi...
  • Islamic State and the Levant
    From Wikipedia, the free encyclopedia Islamic State of Iraq and the Levant الدولة الإسلامية في العراق والشام   ( ...
  • Making Hydrochloric Acid from Household Ingredients
    Making Hydrochloric Acid from Household Ingredients I used to do this when I was young.   I’m uncertain now:   could it not be consider...