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TIL the first photos that came back from Hubble were blurry and to fix that NASA gave it a new prescription lens

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via reddit.com

dDAkK TIL The most valuable issues of National Geographic are generally those published before 1907. The 1904 issue, its first publication containing images, is almost impossible to find in mint condition
GYVP5 TIL, that hagfish slime expands by 10,000 times in a fraction of a second, it is 100,000 times softer than Jell-O, and can fend off sharks
R7VRl TIL that modern humans and neanderthals interbred, and as a result, all non-Africans carry between one and four percent Neanderthal DNA.
d8nPQ TIL of the "Ironman Heavymetalweight Championship", a championship belt that has been won by a ladder, a beer can, an invisible wrestler, and the belt itself among others.
mxdVv TIL of Girgori Perelman, the only person in history to have solved one of the seven Millennium Prize Problems. After solving the Poincaré conjecture Perelman was offered the Field's Medal and $1 million prize money, he declined them both.