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		gwern on June 21, 2011 \| parent \| context \| favorite \| on: Hernando de Soto: The Destruction of Economic Fact... And what did we know about air before the 1500s or so - for the last 50 millennia?

asclepiades on June 21, 2011 | [–]

Without wanting to sound harsh, but we knew it existed and that one could not live without it.

wgren on June 22, 2011 | [–]

From studying sediments and vegetation - quite a lot actually.

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