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TIL that “kiln” was originally pronounced with a silent “n.” Linguists believe that written descriptions of kilns reached people who had never heard of them before; they assumed the “n” was pronounced, and this mispronunciation took over.

nWG7P TIL the Diving Bell Spider spends almost all it's life underwater, it survives by spinning a web between underwater plants and then carries air from the surface down to its web via its body hairs.
4Xdm5 TIL That Leonardo Da Vinci once conducted an experiment to understand the flow of blood through the valves of the heart, by pouring hot wax into one, making a mould of thin glass from the cast, and then pumping water mixed with seeds through it. He saw how a heart actually regulates itself.
OWBe TIL of WW1 Casualty/Mercy dogs. Dogs trained to find wounded or dying soldiers on the battlefield that also carried medical supplies so an injured soldier could try to treat himself (whilst more gravely wounded soldiers would seek the company of a Mercy dog to wait with them whilst they died).
dDKK8 TIL that the original job of the coroner was to collect the revenues of the English Crown - legal fines, buried treasure, shipwrecks, and the like. This included the seized estates of suicide victims and murderers, and over time the office of coroner evolved into the modern function.
9wOjD TIL the first beer in cans came from a small brewery in Wales , named after it's town , Felinfoel brewery . It was "issued" to the British Army in WW2 , where it was given the name Feelin foul.