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TIL of the Lodz Ghetto, where at one point 15000 'useless eaters' deemed 'not fit to work', mainly children under 10, were rounded up and taken away from their families to be exterminated. Some families committed collective suicide.

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woPA8 TIL a crystallographer named Yuri Struchkov authored or coauthored 948 scientific papers between 1981-1990, which equates to 1 paper every 3.9 days. In 1992, he won the Ig Nobel prize in literature for his prodigious contributions to the field.
GA5K5 TIL that after the US hydrogen bomb test in 1954 exposed a Japanese fishing vessel to radiation, over one-third of Japan's population signed a petition to ban nuclear tests. This public outcry influenced Japan to establish its Atomic Energy Basic Law in 1955, forbidding military use of nuclear energ
VMXv0 TIL that many early, animated Disney films were made by filming actors in real time and then tracing over their bodies frame by frame. This led to studios repurposing older animations as time went on, and helped develop modern-day roto-scoping and motion-capture technology.
d8O6K TIL of the "King of All Boomboxes", the JVC RC-M90, which was produced in 1981. LL Cool J and The Beastie Boys made this boombox famous by including it on their album covers. The competitive environment to obtain one is so fierce among collectors that prices are very high and there's much bickering.
wo6D6 TIL that a full-time banker played at the 2010 World Cup. New Zealand's Andrew Barron featured as a substitute in their match against Italy, becoming the first non-professional footballer to participate in the tournament