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TIL of Hallucigenia, a spined and clawed yet worm-like creature so named for its “bizarre, dream-like quality.” Its extant relatives are similarly unique and include nigh-indestructible tardigrades and slime-slinging velvet worms.

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8epaG TIL "Cute aggression" or the urge to squeeze cute animals or babies is the brain’s coping mechanism to temper the onslaught of positive feelings. Because if you find yourself incapacitated by how cute a baby is—so much so that you simply can't take care of it—that baby is going to starve.
4XgRX TIL when Amiens Cathedral was about to collapse (ca. 1500), a huge iron chain was installed inside the walls while still red hot. It pulled the stone arches back into shape as it contracted and cooled.
7rgp7 TIL an Australian man was working as a hairdresser when he had the idea to make 3D printed prosthetic limbs from recycled shampoo and conditioner bottles. Working with 38 salons in Queensland, he is now testing the limbs with two children who had no access to practical and inexpensive prosthetics.
gM8aL TIL the most powerful mutant in the Marvel Universe is Santa Claus
N76mN TIL 1783 the grand master Philodor played and won three chess games simultaneously while blindfolded. Witnesses signed affidavits since they doubted future generations would believe such a feat was possible.