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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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bog4 TIL People can give government more money to reduce the debt without waiting to be taxed.
jNRnR TIL researches at Harvard and Columbia concluded that Sarcasm promotes Creative Thinking because both the expressers and recipients of sarcasm need to overcome the contradiction between the literal and actual meanings of the sarcastic expressions.
kObJg TIL that sharks are older than trees
kORje TIL that the tiniest piece of ceramic (like from a broken sparkplug) can shatter tempered glass with minimum force.
X0JA6 TIL in 2012 an Oregon woman found a letter from a Chinese labor camp prisoner in a box of Halloween decorations she bought from Kmart. She publicized the letter. The man, who had been released in 2010, saw a news story about it and wrote another letter just for her, thanking her for doing that.