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There's a theory from the latest TED talk that says our survival prior to inventing weapons (like spears) depended on running other animals to exhaustion.

http://www.youtube.com/user/tedtalksdirector#p/u/0/b-iGZPtWX...

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The San Bushmen in the Kalahari Desert still do this today. This BBC clip on persistence hunting (narrated by David Attenborough!) is worth a watch; their endurance is absolutely incredible: http://www.youtube.com/watch?v=826HMLoiE_o

Sorry to be a snob but it's not a recent theory, I heard about something like this (men being able to sweat and run long distances, being scavengers, competing with hyenas) about 25 years ago.

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