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TIL the difference between an acronym and an abbreviation

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MeajA TIL Lighthouses had different techniques for rotating the light, most being too slow, making the light less visible. Augustin Fresnel proposed a mercury flotation system in 1825. Despite some lenses weighing over 6,000 lbs. the design reduced friction, increased rotation, and ultimately saved lives.
j0jv TIL All of the chainmail in the Lord of the Rings movie trilogy were made by hand, link by link.
0Jp1 TIL: Vikings would take mushrooms, dress in the bear skins before battle. These were known as Berserkers
Q41L TIL after Hawaiian King Kamehameha was hit in the head with a paddle by a frightened fisherman during a battle, he not only spared the man’s life but decreed a “Law of the Splintered Oar” protecting civilians in war that’s still part of Hawaii law in the State constitution.
5VgL9 TIL A Diplodocus skeleton cast, nicknamed 'Dippy', donated to the Natural History Museum in 1905, is cleaned once every two years, and takes a team of staff two days to clean its 292 bones.