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TIL a hologram is a photographic recording of a light field, rather than an image formed by a lens.

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P5Ae TIL in 1891, William Coley showed that spontaneous remission of cancer could be induced using toxins which model a bacterial infection. Despite treating over 1000 individuals and curing some patients with end-stage cancer, the last recorded use of this therapy was in China in the 1980s.
mxY8o A new study published in the journal Frontiers in Ecology and the Environment suggests that leopards in Mumbai, the world’s sixth most-populated city, may save human lives by feeding on feral dogs. Feral dogs are a major health issue in India, where they are the leading cause of rabies deaths.
KjEB TIL that in 1945 Japanese sailors once submerged a sub while 90 European prisoners including children were on deck, leaving them to be eaten by sharks.
klB5 TIL Futurama writer Ken Keeler invented and proved a mathematical theorem strictly for use in the plot of an episode
pA9O TIL that during the Cuban Missile Crisis, the captain of a Russian sub, not knowing whether war had broken out, decided to launch a nuclear torpedo. Vasila Arkhipov, the second-in-command, didn’t consent and convinced the captain to surface, preventing nuclear war.