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TIL hippo skin naturally secretes anti-bacterial sunscreen. It's red and sometimes called "blood sweat", though it is neither blood nor sweat.

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Z1WR TIL James Cameron made the movie Titanic to get a dive to the shipwreck funded by the movie studio; not because he particularly wanted to make the movie.
9jBG TIL that British spies used semen as invisible ink during WWI. The method was invented by Captain Sir Mansfield Cumming.
Y6aZ TIL Apple deliberately deleted competitors’ music from iPods and iPhones from 2007 to 2009.
worZ6 TIL that "Crystal Glass" is refractive because it's made with Lead Oxide.
d85pd TIL Neonics pesticides introduced to plants at the seed stage act like an appetite suppressant for birds, making them lose weight within hours.