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TIL China and India have been the population centers of the world for at least 6,000 years

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MMJ8 TIL orangutans can use ‘calculated reciprocity’, which involves weighing the costs and benefits of gift exchanges and keeping track of these over time
4XE9o TIL The spire of the Empire State Building in New York was designed as a mooring mast for blimps. After only one blimp docked, the high wind prevented them from ever attempting another docking.
almy TIL that there are “price trackers” for Amazon that show you where the price has been. This is a great tool for avoiding fake Cyber Monday prices.
VMED0 TIL that when James Robert Ringrose, one of FBI's Ten Most Wanted Fugitives, was arrested in 1966, he presented the FBI agents with a "Get out of jail free" card from Monopoly
d8gXK TIL Dr. Joseph-Ignace Guillotin did not necessarily invent the guillotin.