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TIL that when Joan Baez sent her legendary guitar to Martin Guitars for refurbishment, they discovered a message from a previous luthier which read “Too bad you are a communist”.

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9KK6 TIL Most alarms and sirens fall into the frequency range 1-3 kHz where the human hearing is the most sensitive, but this frequency range is also a black spot in our sound location abilities.
N76X8 TIL Burr tried to start his own country in Mexico after the duel with Hamilton
x60kb TIL that the old euphemism for a positive pregnancy test, "the rabbit died", came from a test developed in 1931 wherein the urine from a human female was injected into a rabbit. Soon after, the rabbit was euthanized and dissected to check for the reaction of the hormone hCG in its ovaries.
wowB8 TIL John von Neumann regularly recalled complete novels and pages of the phone directory. He could divide two 8-digit numbers in his head and converse in Ancient Greek at age 6, and was proficient in calculus at age 8. When he enrolled in university at 16, he had already written a research paper.
69RGw TIL Octopuses have three hearts: two pump blood to the gills, and one pumps it to the rest of the body. They also have a central brain and a large neuron cluster, often called a "mini-brain," in each of their eight arms, allowing for significant independent function of each arm!