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TIL The sliding door dates back to atleast the 1st century CE with archeological evidence found in Pompeii.

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j8eE TIL As of 2012, the U.S. had the world’s largest prison population, with over 2.3 million people in prisons or jails, meaning 1 in every 100 American adults are in prison. That same year, it was reported that the U.S. government spent an estimated $37 billion to maintain these prisons.
gr5OD TIL for over 150 years swans have taught each other how to ring a bell for food at Bishop's Palace in Wells
rRaKy TIL that the actor who voiced Charlie Brown is in prison.
KYNoB Today I Learned that Einstein never received a nobel prize for his work on relativity
dDkmr TIL when Chi Chi, a giant panda at the London Zoo, was taken to Moscow to breed with a male giant panda, she refused his attempts to mate with her and made a full sexual self-presentation to a zookeeper.