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TIL : In 1990 Marion Barry the Mayor of DC, was videotaped during a FBI sting operation at a hotel party smoking crack cocaine. He was arrested and sentenced to federal prison. He was re-elected as mayor in 1994 after his release.

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R7VM9 TIL of Mbaye Diagne, a Senegalese military officer and UN observer who disobeyed UN Rules of Engagement to save "at least hundreds" during the Rwandan Genocide.
ADmrg TIL that the ‘sound’ produced by an ultrasound machine is made from applying an electrical current to piezoelectric crystals
R5Ko9 TIL about Tokyo Rose - a group of Japanese female propagandists who broadcast a radio show throughout the South Pacific and continental U.S. to demoralize the allied Navy during WWII. One of their number was found guilty of treason, and subsequently pardoned in the US.
KYQxG TIL about the Janzen–Connell hypothesis, a widely accepted mechanism that asserts that a forest with more diverse species of plants will prosper because the more common a plant species is, the more specialist enemies it attracts.
69XY8 TIL that Olivia Newton-John was granddaughter of the famous physicist Max Born.