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TIL in 1945, at 59 years old, Albert Stevens was misdiagnosed with terminal stomach cancer, and as a result was secretly injected with 131 kBq (3.55 μCi) of Plutonium as part of a human experimentation project by Joseph Gilbert Hamilton. It was later discovered the "cancer" was an inflamed ulcer.

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78akX TIL: The jumping ant, or Harpegnathos saltator, lives in small colonies and when the queen dies, fighting erupts among workers, until a few prevail and become replacement queens, called gamergates.
xgkw TIL Researchers report that nepetalactone, the essential oil in catnip that gives the plant its characteristic odor, is about ten times more effective at repelling mosquitoes than DEET — the compound used in most commercial insect repellents.
BgKQx TIL Birds Use Spikes Intended To Keep Them Away From Buildings As Protection For Their Own Nest Against Predators
JYeKQ TIL that when Indonesia's Mt. Tambora erupted in 1815, it ejected up to 51 cubic miles of pulverized rock and ash into the atmosphere. The debris blocked so much sunlight that it caused global cooling, with New England getting heavy snow into June.
GYLag TIL that during the 1 950's, 60's, and 70's, there were songs called "Teenage Tragedy Ballads" that were about death, unrequited love, and sadness. This phenomenon was partially attributed to the recent deaths of many young music stars.