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TIL NASA worked with a company to create a material called translucent polycrystalline alumina (TPA). It was intended to protect infrared antennas on heat-seeking missiles. This material would later be used for invisible braces due to its strength and transparency.

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Oov0g TIL certain male beetles have spiky penises that injure the females so that their sperm can seep into the bloodstream and encourage other physiological reactions that increase fertility.
rZR1 TIL the world’s largest penis is supposed to be 48 cm. (18.8 in.), and the owner, Roberto Cabrera, needs disability because his member inhibits his works capabilities.
MeVgA TIL that trees near rivers with salmon grow three times faster than trees without them - because bears leave their carcasses to decompose on the banks
JoZm TIL the first use of “toast” as a metaphorical term for “you’re dead” was in the 1984 film Ghostbusters.
170O TIL Attila the Hun’s sword, or the Sword of Mars was said to have been forged from the iron of a meteor and struck by lightning, given the blessing of Mars.