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TIL that certain metals (including copper, brass, silver, and gold) are naturally antimicrobial. A brass doorknob will self-sterilize in about eight hours if left untouched.

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0dw9y TIL that fish skin can be used to heal burn wounds
69ERY TIL when Wolves were reintroduced to Yellow stone national park in 1995, the population of Beavers grew massively as there was less Elk to eat the Willow needed for Beavers to survive the winter. The Beaver dams also counter erosion and create new pond and marsh habitats for lots of other species.
Nr8N TIL: Companies pay Kardashian some $10,000 for every tweet about a product.
9lG6 TIL that a recently published study out of Spain found that THC seems to target and kill some forms of human brain cancer.
YpjgA TIL about the Ghost Moth of New Zealand that spends 5-6 years as a grub, making a burrow in a tree in the shape of a '7', but only spends a couple of days as an actual moth, as it has no mouthparts. If it's lucky enough to find a mate, it lays 2000 eggs before starving to death.