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TIL "Javanese princess" and exotic dancer Mata Hari was a Dutch-born WW1 spy and double-agent, convicted of spying for Germany in France and executed by firing squad.

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nBR7 TIL In 1996, psychedelics-advocate Timothy Leary had his death videotaped to be broadcast on the internet. The footage has never been released.
16MyW TIL that the word "robot" was first used in a play titled "R.U.R.," written by Czech writer Karel Čapek in 1920. The term comes from the Czech word "robota," meaning "forced labor" or "drudgery."
PYQoL TIL when California two-spot octopuses (a specific species) were submerged in an ecstasy solution, they got calmer and more sociable with other octopuses they previously ignored. While this showed they react similarly to humans on MDMA, this was a pilot experiment that needs further research.
wAm7 TIL that in the early 20th century, thousands of people would spend their vacations in a town where the main attraction was a natural source of water that acted as a laxative.
D1A0r TIL that all mammals, from mice to whales, have roughly the same number of heartbeats in a lifetime: 1 billion.