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TIL that malignant teratomas can sometimes contain hair, teeth, bone, neurons, and even eyes.

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mwGp TIL in 1998, a group of hackers – identified only by their “hacker names”, including “Kingpin”, “Mudge”, and “Space Rogue” – testified before a U.S. Senate committee. They described how they could take make the internet “unusable for the entire nation” with “just a few packets”.
epWkL TIL the International Phonetic Association, the organization who developed the International Phonetic Alphabet, was originally called 'Dhi Fonètik Tîtcerz' Asóciécon'
ADB44 TIL the coelacanth, a prehistoric lobed-finned fish, was believed to have become extinct in the Late Cretaceous Era 66 millions years ago, until they were rediscovered extant off the coast of South Africa in 1938.
LQ5r TIL that Malcolm X was declared mentally unfit for military service after telling draft board officials that he wanted to “steal us some guns, and kill us [some] crackers”.
R5PZj TIL that in 1859, a geomagnetic storm from a huge solar flare hit the Earth and auroras were visible around the globe. Telegraph systems in Europe and North America failed. Some telegraph equipment operated for over an hour without needing external electrical power.