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TIL about Superfecundation and Superfetation. Rare but possible in humans, in Superfecundation the mother produces several eggs at the same time, they are fertilized by different fathers, and she has twins. Superfetation is when a woman ovulates while pregnant and has two pregnancies at once.

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drAB TIL a group of unpaid volunteers travels around Detroit mowing and cleaning neglected parks. They call themselves “the mower gang”.
PYPG TIL that in WW2 Lieutenant Robert R. Klingman used the propeller of his F4U Corsair to destroy an enemy reconnaissance plane. With his guns jammed, he ground away the enemy plane’s tail until it lost control and crashed. Klingman made it back to base and was awarded the Navy Cross.
0xr1 TIL in the 1970s after Boeing fired 63,000 employees in Seattle alone, someone put up this billboard: “Will the last person leaving Seattle - Turn out the lights.”
5No9 TIL Keith Moon and John Entwistle once payed a hooker $100 to give Pete Townshend gonorrhea
nen7B TIL Railway employees in Japan use a system called “Pointing and Calling” to reduce mistakes. This involves pointing at a sign or signal and calling out the status. Though it may look silly, making these gestures and saying the status maintains focus and attention, greatly reducing workplace errors.