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TIL Flat adverbs, where the adjective and adverb have the same form, used to be much more common in the 18th century until a bunch of grammarians decided adverbs must end in -ly. Examples of surviving flat adverbial usage today include “sit tight” and “go slow”.

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Wg5Y TIL a Russian nuclear submarine had its electricity cut by the electricity company at a naval base due to unpaid bills. The submarine’s cooling system stopped working and the reactor came close to meltdown
Z8aDG TIL that there are walls in Scotland that people made during the Iron Age using heat to melt rocks together, but the specific methodology is unknown and continues to baffle scientists. They are the Vitrified Walls of Scotland but can be found in other European countries as well.
8joL TIL: Dr. Yamanaka was described as an incompetent surgeon. He later turned to research and discovered Induced Pluripotent Stem cells and received a Nobel Prize for it.
6nZ8 TIL A Canadian university gave out free condoms with notes attached promoting safe sex. These were later recalled because the staples used to fasten the note had punctured the condoms
7r40L TIL that a short stretch of highway in Arizona counts off exit numbers, road signs and markers in kilometers due to a push in the 80's to convert the country's measurement system to metric.