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TIL: Leonardo DaVinci was the first person to explain why the sky is blue

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l7ZVA TIL Blanche Kelso Bruce, who served as US senator from Mississippi, was an escaped fugitive slave
rNW7o TIL about “Yubitsume” or finger shortening......... a Japanese ritual to atone for offenses to another, a way to be punished or to show sincere apology and remorse to another, by means of amputating portions of one's own little finger.
EN7d TIL There is a database dedicated to tracking every bomb ever dropped by the United States. So far the Theater History of Operations Reports (THOR) details nearly 15 million bombing missions ranging from WWI to Vietnam.
P15WZ TIL that the velociraptor was actually about the size of a turkey and weighed between 31 and 43 lbs (14 - 19.5kg).
a8P9b TIL that veteran astronaut John Young's heart rate when launching on top of the Saturn V was only 70 bpm, the normal resting heart rate; meanwhile, his rookie crewmate's heart rate was 144 bpm, more than double. Young later said his heart "was too old for it to go any faster".