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TIL the reason a Blu-Ray disc holds 5x more data than a DVD is because a blue laser has a lower wavelength than a red one, which means it can read and write data more precisely, much like writing with a ballpoint pen instead of a crayon.

YOMd TIL that an Australian study looking at 91 patients who claimed to have had their drink spiked found that zero patients had actually been exposed to sedative drugs in their drink.
a8JGJ TIL That the name of the first dog in space (Laika) literally translates to "Barker", a name which the technicians gave to her due to her loud barking during training
0wQDA TIL the 2nd deadliest day for law enforcement in the U.S. was a 1917 bomb attack that killed nine Milwaukee police officers. The original target was a local church but a boy discovered the suspicious package and brought it to the police department, where it exploded. (The deadliest day was 9/11.)
wLAWP TIL Chuck Wepner, the inspiration for Rocky, boxed/wrestled Andre the Giant in 1976. It is speculated that the match influenced Rocky III (1982), which features a fight where Hulk Hogan, "Thunderlips", throws Rocky out of the ring, as Andre did Wepner in real life.
QN7K6 TIL The 80 year old Archbishop of Canterbury refused to delegate Edward VII's coronation despite his ailing health. His speech was printed in gigantic letters so he could see it, he couldn't get back up after kneeling, he placed the crown backwards and yelled "go away!" when asked if he was ok