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A gene that separates humans from the apes and all other animals seems to have disappeared from humans up to three million years ago, just before they first stood upright, researchers said on Monday. Most animals have the gene but people do not -- and it may be somehow involved in the expansion of the brain, the international team of researchers said.

The same could be said for the baculum as well. That makes an even bigger difference.

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The same could be said for the baculum as well. That makes an even bigger difference.

And no vibrissa. That makes us just about the only mammal literally out of touch with it's environment...