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245		4	_aThe Day We Learned To Think
300			_aUnderstanding of humans' earliest past often comes from studying fossils. They tell us much of what we know about the people who lived before us. There is one thing fossils cannot tell us; at what point did we stop living day-to-day and start to think symbolically, to...
650			_xScience.
856			_uhttp://topdocumentaryfilms.com/day-learned-think/
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