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TIL of Porajmos, Nazi Germany’s and its WWII allies’ effort to commit ethnic cleansing and eventually genocide against Europe’s Romani people. Later research cited by Ian Hancock estimated the death toll to be at about 1.5 million out of an estimated 2 million Roma.

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lgdV TIL that in 1945 Soviet school children presented a US Ambassador with a carved US Seal as a gesture of friendship. It hung in his office for 7 years before discovering it contained a listening device.
Z80jQ TIL upon graduating, Teddy Roosevelt's doctor advised him to pursue a desk job and avoid strenuous physical activity due to serious heart problems. Ignoring this, he instead pursued activities like regular exercise, boxing, tennis, hiking, rowing, polo and horseback riding, even into his presidency.
OpJL TIL the record for longest consecutive prison sentence ending with the prisoners release is 68 years. Paul Geidel was convicted of 2nd degree murder at the age of 17 and was released at the age of 86.
neaQ7 TIL of the Haber–Bosch process developed in the 20th century - the process produces 450 million tonnes of nitrogen fertilizer per year now & has allowed to global population to grow from 1.6 billion in 1900 to 7 billion today
M7Meb TIL: It is only 78 years since the first patient was treat with penicillin