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TIL: NYC subway's signal technology is nearly a century old, and signal operators don't know precisely where each car is on the tracks at any given time.

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v1M5D TIL the Rolling Stones’ first No. 1 single, '(I Can’t Get No) Satisfaction', was written, in part, by Keith Richards during a dream. Apparently, while asleep, he started rolling a tape and playing guitar, and the next morning he listened back and was satisfied with about 30 seconds of the riff.
awjAo TIL that birds are, taxonomically speaking, the last extant dinosaurs and, as such, are technically a type of fish.
M7MkB TIL female marmosets are more likely to commit infanticide when they're pregnant and getting close to giving birth to increase their own baby's odds of having a successful life
XaMX TIL during World War II, President Dwight D. Einsenhower predicted that people would try to deny the holocaust ever happened, and therefore ordered people to take as much photographs of the Nazi crimes as possible in order to avoid such attempts.
ODK6 TIL When a male honey bee climaxes during sex, his testicles explode and he dies.