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TIL the Japanese used "nightingale floors" to alert castle lords to enemy attacks. These floors were designed so that walking on them created a shrill chirping noise. To tell friend from foe, the lord of the castle would identify a set rhythm for allies to use when walking on the nightingale floors.

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MeWlm TIL there is a theory that some of the Black Death was not bubonic plague, but a variant of a haemoratic fever. Those who survived may have passed this immunity through genetics which may account for the percentage of individuals who are immune to AIDS.
0wZ8y TIL a study discovered when Christian students were reminded of the "religion and science don't mix" stereotype, their intuitive reasoning dropped while Christian students who weren't reminded of that stereotype performed as well as non-Christians.
oBjbE TIL the scientist that discovered how sweat regulated body temperature did so by standing in an oven. On occasion he was joined by a colleague, a dog, and beef steaks. The food cooked, the men and dog were fine.
XEWEP TIL as the child of an international lawyer, Jeopardy! "Greatest of All Time" champion and interim host Ken Jennings grew up in South Korea and Singapore. He only began living in the United States permanently upon admission to the University of Washington in the 1990s.
kPYE TIL that since Abraham Lincoln’s burial, his coffin had been moved 17 times and opened 6 times. On the last time the coffin was opened (1901) his face was still perfectly recognizable