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TIL "AC/DC" is an abbreviation meaning "alternating current/direct current" electricity

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BRbk TIL that Harvard College is suspected of grade inflation. The median grade is an A-, and the most frequently awarded mark is an A.
X051Q TIL Neil Armstrong thought they had a 90 percent chance of getting back to Earth but only a 50-50 chance of making a successful moon landing on the first attempt. There were too many unknowns in descending from lunar orbit down to the surface that hadn't been demonstrated by testing
4Xxo5 TIL that in the Falklands, an abandoned minefield has accidentally become a penguin sanctuary. The mines were set in the Falklands conflict and have remained there since, keeping humans away. The local Magellanic penguins are too small to set them off and have thrived in the area.
eKx4 TIL When a mission-specific capture bar failed to capture a Satellite in outer space, Nasa Astronauts caught and roped in a 4.5 ton communications satellite with their bare hands.
PydZ TIL that women in the national House of Representatives did not get a nearby ladies room until 2011, almost 100 years after they first became present in the House.