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TIL the "dirt" under your fingernails is most commonly the keratin debris from the underside of the nail, as well as skin cells from the nail bed.

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NXG0Q TIL of Provo Wallis a Canadian who helped capture the US warship the Chesapeake, during The War of 1812. Wallis served in the Royal Navy from the age of 4 until he died aged 100, having seen 96 years of duty.
WkyZd TIL that medieval moats served not only the purpose of being a physical barrier, but when water-filled were also able to prevent enemies from tunneling and undermining a wall, by saturating the ground making tunneling very difficult.
wolWY TIL Descartes was about to publish "The World" in 1633 but then he learned that Galileo had been condemned for publishing the view that the Earth revolves around the Sun. Descartes suppressed his book but still hoped that his physics would one day be taught in Catholic schools
pnw4 TIL bat bombs are large bomb casings that would open above cities and release bats with small, timed incendiary bombs. The bats would find somewhere to roost, and the city would burn down.
O7jg TIL that if all the gold ever mined were melted into a cube, it would measure only about 68 feet in each direction