"The Sentinal of Eternity" was Clark's prelude to 2001.
https://archive.org/stream/10_Story_Fantasy_v01n01_1951-Spring_Tawrast-EXciter#page/n39/mode/2up
Doomsday argument
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From Wikipedia, the free encyclopedia Islamic State of Iraq and the Levant الدولة الإسلامية في العراق والشام ( ...
