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TIL only two percent of the fissile material in Little Boy, the atomic bomb dropped on Hiroshima, actually detonated. In other words, seven-tenths of a gram of Uranium-235 leveled a two-mile radius of the city.

Read more factually.gizmodo.com

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bAn7 TIL the word “bully” was first used in the 1530s to mean “sweetheart”. In the 1700s, pimps began to be called called bullies because they were “lovers” (as well as “abusers”) of their prostitutes. It is thought that the meaning of the word bully eventually changed to its current one as a result.
olBA TIL that mosquitoes with malaria spend more time probing for blood when they bite, presumably increasing the odds of infection. The disease may be controlling the mosquitoes’ nervous system.
e956 TIL switching to a national electricity grid instead of 130 regional grids would save $47 billion yearly and make utilization of solar energy more efficient
X0pKj TIL that Kurt Cobain's daughter is in a relationship with Tony Hawk's son.
xJa1 TIL that marine officials in Honduras trained sharks to hunt Lionfish, which were invading the population.