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TIL for 50+ years, Australian children in the outback attended school via shortwave radio and sent homework via air mail due to the distance between homes. "Schools of the Air" were many children's first social experience outside their families; its quality equaled or surpassed traditional schools'.

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4kkAo TIL of 'brood parasitic' Cuckoo Bumblebees - they don't make nests or form colonies; their queens aggressively invade the nests of other bumblebee species, kill the resident queens, and then lay their own eggs, which are cared for by the resident workers.
Wk6G8 TIL About Desmond Doss, a non-combatant combat medic with an infantry company serving in World War II. At the Battle of Okinawa, he single handedly saved 75 mens lives, one at a time whilst under gunfire, becoming the only conscientious objector to receive the medal of honour for his actions.
e0KP6 TIL an article in 1968 revealed widespread marijuana use among US soldiers in Vietnam. As a result of the media uproar stateside and subsequent crackdown by the army, soldiers shifted to heroin, which was odorless and harder to detect. By 1973, up to 20% of the soldiers were habitual heroin users.
woPXo TIL about a brief conflict known as the Football War or the 100-Hour War, between El Salvador and Honduras, in the FIFA World Cup, which erupted following a series of violent incidents during FIFA World Cup qualifiers between the two countries. This was an expected extension of the Cold War
yVgoX TIL Paper is the best option on the first throw in a game of Rock, Paper, Scissors when playing against inexperienced players because they tend to lead with Rock. And Scissors is the best option on the first throw against experienced players because they won't lead with Rock as it'd be "too obvious"