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TIL snakes and lizards have 2 penises in males and 2 clitorises in females, with species-specific spiky structures that interlock.

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epDYD TIL about an innocent man on death row
mxRoP TIL that every number has its own Wiki page
AX6x TIL that strontium, a chemical relative of calcium, can be given to increase bone density, fractures, and promote bone regrowth, essentially acting as calcium in the bones better than calcium itself does
VMWX0 TIL The FBI’s Indian Country program includes over 140 special agents and 40 victim specialists in 36 field offices. Indeed, 33% of all FBI victim specialists and 50% of all FBI child and adolescent forensic interviewers work directly with victims and families on more than 200 Indian reservations.
wLxR7 TIL in 1985 the US tested a robotic anti-aircraft tank, the M247 Sergeant York. The tank malfunctioned and locked its guns onto a review stand packed with top generals. Mercifully it didn't fire, but did subsequently attack a portable toilet instead of a target drone.