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TIL Smoking in the presence of a child is considered physical abuse in Latvia.

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via reddit.com

kOLm4 TIL Klystron (linear beam vacuum tubes used in particle accelerators) comes from the Greek verb klyzo - referring to the action of waves breaking against a shore.
oQA7 TIL that Bill Watterson, the author of “Calvin and Hobbes”, believed that adapting the comic to any other medium would compromise its integrity. He believed this so strongly that he turned down personal calls from Steven Spielberg and George Lucas offering to make animated movies.
0wBNA TIL that unlike chimpanzees, bonobo societies are relatively peaceful, with squabbles rarely escalating to serious violence. Female bonobos spend their time together in the center of the group, grooming, eating and socializing. Often, two females will embrace and rub their genitals together
4XJ96 TIL that flatfish (turbot, sole, halibut, etc) start off round but then morph into flat bodies, with their eye coming around to the other side of their head. (Video of this linked.)
GYEm5 TIL That this day 125 years ago physicist Wilhelm Conrad Röntgen becomes the first person to observe X-rays a significant scientific advancement that would ultimately benefit a variety of fields most of all medicine by making the invisible visible.