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TIL the US military DARPA program is developing an implantable system able to provide precision communication between the brain and electronics. Electrochemical signaling used by neurons in the brain will connect to technology language allowing for communication.

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L5yZ TIL that Eratosthenes, along with countless other achievements, calculated the size of the earth in 240 BC using a stick, the shadow of the sun, and the known distance between Alexandria and Syene. He was off… by only 66 km.
GY0Zj TIL: In 1901, the assassin of President William McKinley was tried, convicted AND executed only 45 days after McKinley’s death
rR8de TIL that there are 20 million tons of gold in the sea.
kAde TIL that it is illegal for a check to be written for less than $1
wLvn7 TIL a 'deadline' (1860s) was a line drawn in or around a prison that inmates would be shot dead for crossing.