Crazy how much aging boils down to oxidation. Electrons running downhill. Down into the dust 
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Liver spots? Oxidized proteins & lipids that glom up in cells; undigestible pigment. They show up in skin, heart, brain, other organs. See: lipofuscin. A trained eye can tell the age of a mouse by the brain lipofuscin build-up. Or a lobster's age from the amount in the shell!
6:52 PM - 8 Oct 2018
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