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CellBioGuy comments on Fermi paradox of human past, and corresponding x-risks - Less Wrong
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Worth noting:
Rudimentary grain cultivation has been pushed back at least 23k years ago, well into the last glacial maximum and probably older: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0131422
Cooked grain flour has been observed in Italy over 30k years ago, no information on the plants it came from.
Possibly indicating that the end of the last glaciation rather than new invention drove the more or less simultaneous large-scale agricultural transitions that occurred all across the old and new world ~10k years ago.
Interesting.