Losing 500K per hour

That's right. We lose 500,000 skin cells per hour. They die, flake, and sluff off at an astounding pace. The skin makes up 16.6% of our weight. Scientists think the combination of skin and its special features plus running - were the two key adaptations that led to humanity's prominence, and are inter-related.

(note: human discussion starts at around 7:00 of this clip and goes on to part V)

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