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TIL Banach-Tarski Paradox: if you accept as true the Axiom of choice (i.e. from non-empty set you can always pick up a random element) then you could decompose a golden sphere into a finite number of pieces and, without any strecthing, reassemble these into two balls identical to the original one.

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Vw80 TIL that the liver is the only human organ able to fully regenerate itself. As little as 25% of a liver can be regenerated into a whole liver.
VBYlG TIL America own an uninhabited zone called Howland and Baker Island, halfway between Australia and Hawaii. It observes it's own time zone called "Anywhere on Earth". A day has passed everywhere on Earth according to this time. Amelia Earhart was trying to reach here in 1937 before she disappeared.
w8BM TIL the vision of canals of Mars were a result of a malfunction of Percival Lowell’s telescope that allowed him to see the reflection of his own blood vessels.
j6AEn TIL a propulsion system travelling at light speed is possible with our current knowledge, but the amounts of energy required are too great for it to be feasible. A spacecraft with a 100m radius would need an amount of energy that is 100s of times Jupiter's mass just to maintain the speed of light.
d8M9Z TIL that the chestburster scene in Alien was inspired by the pains the writer suffered as a result of Crohn's Disease