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TIL In a Study just published in Scientists Grew Mini Organs From Stem Cells That Build Their Own Blood Vessels

Read more nature.com

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e4Mg TIL when an online college in the US jokingly offered, as an April Fools gag, a course called ‘Underwater Basket Weaving’ (a notorious code for a do-nothing class) the school was forced to apologize when they were accused of being disrespectful to indigenous cultures.
b8b0 TIL that Mister Rogers once had his car stolen and had it returned 48 hours later. After he filed a police report and TV picked up on it it was returned with an apology letter.
QZ5L TIL of David Shaw, who upon breaking 4 diving world records at Bushman’s Hole, South Africa, discovered the body of a fellow diver from 10 years prior and died himself on a subsequent trip to retrieve the body
VMlv8 TIL The rotating door was created by a man in the later part of the 1800s so he wouldn't have to hold the door open for the women or get stuck holding it for everyone. An added bonus was that it reduced heating and cooling costs by 30%, making it much more energy efficient.
1aVKD TIL that fluoride taken in from drinking water becomes a component of saliva, which helps oral health by helping to rebuild weakened tooth enamel.