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TIL in 1951, Dr. W Grey Walter built a "tortoise" robot that can detect and move around obstacles and "see" by going towards or away from bright light, and return to its charging station when the battery charge is low.

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0nb5 TIL a 12 year old boy who saw his own father murdered by a family friend, avenged the death of his father by killing the alleged murderer in a revenge attack he had planned for 12 years. He cut him into 12 pieces, one each for the years of wait.
m1NLM TIL that after Leon Czolgosz was executed for assassinating US Pres. William McKinley, the prison warden poured sulfuric acid on the corpse, burned his belongings, and refused to turn over the body to Leon's brother. This was to prevent exhibitions of his life
M6yW TIL Baseball has a rule which says players cannot fraternize with the other team while in uniform.
nQvr TIL no American ice hockey team has won gold at the Olympics without a player from Warroad, MN, population 1,781
v1PPD TIL that the first weather satellite was launched (1960) before the first human spaceflight (1961)