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TIL: The first quantitative estimate of the speed of light was done in 1676 by timing eclipses of Jupiter's Io.

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e00VL TIL that dysentery is not one specific disease, but a manifestation of any of several gut infections (usually Shigella, Salmonella, C. diff).
a8NXZ TIL that heartbreak can cause physical discomfort and nausea, likely due to our "social-attachment system" triggering the "pain system" to maintain close social bonds, leading to distress when those bonds are broken.
5YwMR TIL the Apollo 11 rock presented to Ireland was accidentally discarded in a landfill known as the Dunsink Landfill in October 1977 following a fire that consumed the Meridian room library at the Dublin Dunsink Observatory where the rock was displayed.
b99Y9 TIL in 1985 a drunk student hijacked a Boeing in Trondheim, Norway demanding to talk to the prime minister. He later surrendered in exchange of more beer.
QJPoM TIL some snow plow trucks in Alaska use heads-up displays that show where the road is under the snow, allowing workers to continue plowing roads in zero visibility, white-out conditions.