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TIL of a Chinese general with 100 troops who had to defend a town against 150,000. He told his men to hide, flung open the gates and sat on the walls playing a lute. The opposing general, certain it was a trap, ordered a retreat

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XAxj TIL in the Great Plague in England, sufferers in a village called Eyam decided to quarantine themselves instead of running elsewhere. 260 out of 350 died, but their actions saved 1000s of others.
D1Ejj TIL about the polio epidemic of August 1952 in Copenhagen, Denmark. This epidemic ushered in the widespread use of positive-pressure ventilation, replacing the negative-pressure iron lung machine. It is also during this time that the concept of an intensive-care unit (ICU) was first introduced.
rjLd TIL that a 2005 research by the University of Miami on lethal injections in the U.S. found that the post mortem blood concentration of anaesthetic (Sodium thiopental) in 43 out of 49 executed inmates were lower than that required for surgery. 21 inmates had concentrations consistent with awareness.
rRbJd TIL: On an aeronautical chart, a big circled P means you may not fly there. Many world military and government sites are so-marked. Also, in the US, one may not overfly George Washington's home, Bush family homes, Disney sites, or the Boundary Waters canoe wilderness --or some WrestleMania venues.
jpaR TIL the Milky Way has several “satellite galaxies”, smaller galaxies that orbit our galaxy like moons to a planet.