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TIL Cross circulation where a second human (usually they patient's father) was used as a heart bypass 'machine' was used for the first surgeries to fix congenital heart defects in children.

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wLek1 TIL there is a group of scientists that believe a virus came to earth on the back of a meteor and then infected a group of squid which then evolved into octopuses.
OYAR TIL that stairs in medieval times wound in a clockwise direction to place attacking swordsmen (often right-handed) at a disadvantage.
WvnX TIL that in the original draft of the Declaration of Independence Thomas Jefferson had wrote,“We hold these truths to be sacred and undeniable.” It was Benjamin Franklin who changed “sacred” to “self-evident” to champion rationality as opposed to religious providence
Ex6w TIL when Alien was first screened to audiences, ushers fainted, people vomited, and some ran screaming from the theater.
RJyl TIL CIA director John McCone told RFK he believed there were TWO shooters that assassinated his brother JFK.