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TIL that in the 80s, Soviet spies were suspected of planting bugs inside typewriters to monitor the electrical noise generated as the type ball rotated and pitched to strike the paper; the characteristics of those signals could determine which key was pressed.

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8eL1P TIL when Nirvana's opening band, Calamity Jane, got booed off stage at a concert in Buenos Aires, Nirvana decided to teach the crowd a lesson. So before every song of their set, they'd play the intro to "Smells Like Teen Spirit" & then just stop before continuing on to play an obscure song of theirs
j66YE TIL that there are around 50-60 blue faience hippopotamus statuettes that survived from Ancient Egypt. Due to the danger hippos posed in the wild, they often snapped off the legs of hippopotamus statuettes before placing them in tombs, so the hippos wouldn’t be able to eat the soul of the deceased.
vAaR TIL of Najih Al-Baldawi, an Iraqi man who sacrificed himself by hugging a suicide bomber as they detonated inside a shrine, reducing the force of the blast and saving dozens of people.
Br0ny TIL Since 1967, February 29th has been the official birthday of Superman, but not Clark Kent.
ADAk7 TIL The ancient Romans in Pompeii had "nearly perfect teeth" because of the lack of refined sugar in their Mediterranean diets.