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Originally Posted by Rough Rider
Homo Erectus some 1.5 - 1 million years ago, Homo Sapiens some 1/2 a million years ago.
"Lucy" is an Australopithecus Ramidus .. some 3.2 million years ago. they found something that dates back a bit farther than lucy. and judging by the bone structure was a bi-ped. which dates back to almost 4 million years ago.
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I wonder how the 500,000 year mark for Homo Spiens is arrived at? Documented history goes back, what about 3000 years? Even if the figure is 5000 years, that leaves 495,000 years of undocumented (pre-historic) history? Wow, so much that we don't know.