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TIL that photoelectric cells (which effect explained by Einstein) switched the lights on during the exposition of Chicago from 1833. They were activated from photons coming from Acturus star ; those took 40 years to land there and were released from the star during the previous exposition

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LQV5p TIL the Drake Equation is a scientific formula to estimate how many intelligent extraterrestrial civilizations within our galaxy are within radio communications range of Earth. Formulated in 1961, the original estimate was a minimum of 20.
a8PVN TIL on the 13th of July 1985 there two Live Aid concerts. One at Wembley Stadium in London and one at John F. Kennedy Stadium in Philadelphia. Phil Collins performed in both (helicopters from/to stadiums and Concorde for crossing the ocean).
KY9jw TIL the 1946 film, It’s a Wonderful Life, was unsuccessful at the box office, and became a Christmas classic after its copyright expired in 1974 following a lack of renewal and it entered the public domain, which allowed it to be broadcast without licensing or royalty fees
ADJe7 TIL: about The Battle Of Blair Mountain - the largest labor uprising in United States history and the largest organized armed uprising since the American Civil War. For five days from late August to early September 1921, some 10,000 armed coal miners confronted 3,000 police and strike-breakers.
0LwR TIL that the only woman who served in front-line reconnaissance in the Soviet marines during World War II, carried hundreds of men off the battlefield and was seriously wounded three times, received the highest award in the Soviet Union only in 1990, 45 years after the end of the war.