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Luke earned this badge 4 times
jan 25 at 19:14
(post deleted or otherwise unavailable)
jul 26 at 21:54
Why does hair turn grey or white, and why does it happen later for some?
jul 19 at 12:01
Are human bodies programmed to die?
apr 30 '12 at 6:46
How many genes do we share with our mother?

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