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TIL that approximately 65000 tonnes of chemical warfare agents (CWA), for example, mustard gas, Clark I, Clark II, Lewisite and Adamsite, were dumped in Baltic Sea and Skagerrak from 1947 to 1948.

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OoWO7 TIL The radio hat was a portable radio built into a pith helmet that would bring in stations within a 20-mile (32 km) radius. It was introduced in early 1949 for $7.95 as the "Man-from-Mars Radio Hat."
oBll7 TIL that Holger the Dane is a fabled Frankish knight, and statue, in the catacombs of Kronborg in Denmark. He will, according to folklore, come to life if Denmark is ever threatened by a foreign invasion. He was first mentioned in the 12th century, and the statue was built in 1907.
dDke7 TIL the first woman to be executed by the U.S. federal government was Mary Surratt, conspiring in the assassination of President Abraham Lincoln.
1857 TIL that during WWI, the Belgian King personally led the army, the Queen served as a nurse, and the 14 year old Prince enlisted as a private and fought in the ranks.
JPrm TIL: Even as an adult, Christian VII of Denmark remained childish and playful. Diplomats complained that, when he was discussing affairs of state with them, without warning he would slap them violently round the face.