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TIL we can’t see atoms under an ordinary microscope because atoms are smaller than the wavelength of visible light. The smallest thing we can see with visible light contains 10 billion atoms.

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AN6Ml TIL in 1982 a crew of five sailing from Maine to Florida ran into a storm with 30-foot waves which capsized their boat. Over the next five days, two of them became delirious after drinking saltwater and walked off the dinghy into many awaiting sharks. Infection killed a third, leaving two survivors.
vxe8 TIL in 1971 the Indonesian government began “Operation Penis Gourd” to eradicate the traditionally worn penis gourd and encourage people to wear shorts/shirts instead. Since residents weren’t given changes of clothing or soap, the unwashed clothes caused skin diseases and the program was abandoned.
pNRA TIL Video games can actually make gamers nicer people in real life, contrary to popular belief. Doing bad things inside a video game can make gamers feel guilty about their virtual actions, and they compensate by engaging in morally acceptable actions in real life
nePW7 TIL that many blueberries, blackberries, and strawberries have little transparent worms in them, that eventually turn into fruit flies unless you eat them first. Known as "Drosophila suzukii", this particular species first appeared in the United States in 2008. They are safe to eat.
rNYAM TIL that the coldest temperature in the universe, as far as scientists can tell, occurred on Earth. In 2003, physicists at MIT reduced the temperature of a cloud of sodium molecules to 810 trillionths of a degree F above absolute zero.