Humans in the palaeolithic period ground and ate flour 20,000 years before farming began according to new investigations. Flour residues recovered from 30,000-year-old grinding stones found in Italy, Russia and the Czech Republic point to widespread processing and consumption of plant grain, according to a paper published online this week in Proceedings of the National Academy of Sciences.  The full story is here in Archaeology Daily News.
http://www.archaeologydaily.com/news/201010205344/Stone-Age-flour-found-across-Europe.html

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