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TIL: Supernova Stars observations have been used to derive a mean rate of supernova per century. The total Galactic Supernova rate is found to be 3 ± 1 per century.

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b9VRQ TIL Dr. Henry Heimlich performed the Heimlich maneuver in his assisted-living facility in 2016 (at age 96), saving a woman's life.
kO7p7 TIL that there's a suicide method called "Suicide by Cop", in which a suicidal individual deliberately behaves in a threatening manner with intent to provoke a lethal response from a public safety or law enforcement officer.
p8KR8 TIL serial killer Carroll Cole, responsible for the deaths of at least 15 women, killed his first victim at just 8 years of age, drowning a classmate in a lake. The death was thought to have been an accident until he confessed in an autobiography he wrote in prison.
4kN6J TIL: Helium, the kind we suck from balloons at parties, is a finite, non-renewable resource that’s only recoverable in a few locations around the world. It’s also needed for MRIs, microchips, and fiber optic cables.
NXAP1 TIL the boom in mathematics during the 17th and 18th centuries in the Western world is correlated with the development of artillery and the increasing need for military professionals, especially artillerists, to be skilled in mathematics