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TIL that most blackboards are actually green because boards that were black tended to reflect a lot of light, while green boards reduced glare and were favored by teachers who had to stare at them all day.

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kOXYE TIL A couple was found murdered execution style on a dirt road in South Carolina. Despite their remarkable features and mortuary photographs, the couple and their killer(s) have never been unidentified.
ADN17 TIL that despite US denial for 26 years, eight members of the Alabama Air National Guard volunteered to pose as Cuban rebel pilots during the Bay of Pigs invasion. Of these 8, 4 were killed when promised air cover never arrived, with two of the pilots dying in a firefight after being shot down.
MeYda TIL Leonardo Da Vinci is credited as being first to correctly explain Earthshine
ne7dG TIL of Clive Wearing, an acclaimed musician who has serious amnesia after contracting herpes; he can't form memories longer than 30 seconds and always thinks he's just awoken from a coma. Despite this, he can recognise his wife and can still conduct an orchestra.
0OON TIL Make Love Not Warcraft from South Park almost caused Trey Parker to lose it because he thought it was so remarkably bad, but it ended up to be regarded as one of the best South Park episodes ever created.