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TIL hydrogen peroxide comes in brown bottles because exposure to light decomposes the solution.

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GV0G TIL 85 percent of Belarusian children are deemed to be Chernobyl victims: they carry “genetic markers” that could affect their health at any time and can be passed on to the next generation
JXoQ TIL that during a siege, the viking legend Harald Hardrada fell sick, faked his death, and had his men convince the enemy to bury him inside the castle. As they entered, they dropped the casket, took up arms and conquered the castle
8e8GV TIL that the Eiffel Tower can be 15 cm taller during the summer, due to thermal expansion meaning the iron heats up, the particles gain kinetic energy and take up more space.
VBjOQ TIL that The Royal Philharmonic rarely allows full organ power, but it did for Aurora's The Seed, accompanied by Anna Lapwood.
78Ayx TIL of Kaskaskia, IL, which, as a result of a shift it the Mississippi River's course, is now on the Missouri (West) side of the river and so only accessible from Missouri. 21 people live there today but it was once the capital of IL.