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TIL People with Capgras syndrome have an irrational belief that someone they know or recognize has been replaced by an imposter. Capgras syndrome is what's known as a delusional misidentification and is most commonly associated with Alzheimer’s disease or dementia.

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WkOV9 TIL a cockroach can "karate kick" an emerald jewel wasp in the head. If not kicked away, a wasp injects venom into a roach's brain & midsection which paralyzes a roach's front legs & makes it a zombie to be led by its antennae; then it gets stuck with a wasp egg & eaten alive by wasp larvae.
5M4p TIL: In the US, it’s illegal to fire someone for talking about their salary with their coworkers.
LkW0Z TIL about Grace Hopper who was the inventor of the first compiler, the intermediate program that translates English language instructions into the language of the target computer.
yVdPM TIL that a previous rough cut of the 1980 comedy movie Airplane! was 115 minutes. After it was previewed at three college campuses and two movie theaters, the filmmakers trimmed the movie down to 88 minutes due to audience feedback.
0dZr5 TIL Handel composed his world famous "Messiah" oratorio in just under 30 days after receiving text compiled by wealthy land-owner Charles Jennens. Jennens was unimpressed by the final product, and claimed the quick turn around time was not due to excitement for the job, but by "careless negligence".