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ghshephard
on July 5, 2013
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The last Incan suspension bridge is made entirely ...
The Green Revolution [1] advanced modern agriculture far beyond any historical antecedents (rumored or documented) that I've ever heard about - but I would be delighted to hear otherwise.
[1]
http://en.wikipedia.org/wiki/Green_Revolution
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[1] http://en.wikipedia.org/wiki/Green_Revolution