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TIL coins like pennies actually have no odor. Metals such as iron & copper catalyze a chemical reaction in skin oils which produces the source of the "metal smell", a compound called 1-octen-3-one, and every person's smell is slightly different.

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WkeAd TIL A 30,000 Year Old Virus Was Found to Still Be Infectious After It Was Isolated from Siberian Permafrost
Z8bgv TIL that cats can easily survive falling at terminal velocity, and in fact have a higher rate of survival the further up they fall. One cat fell 32 floors onto concrete and survived with a chipped tooth.
p89NN TIL about Fordite: layers of hardened automobile paint taken off factory floors that are cut and polished and can be made into jewelry.
R5nZj TIL that mountain lions kill animals much larger than they can eat in a sitting, because other predators (wolves, bears, etc) will inevitably steal their prey. These carcasses become complete ecosystems to several insects who travel from carcass to carcass.
gMeKD TIL In 1814 in London, the brewing vats in a brewery burst, releasing 580k to 1.4m litres of beer onto slum dwellings. Eight people were killed, five of them mourners at the wake of a two-year-old boy. The brewery almost went bankrupt but was saved when they received a rebate for the lost beer.