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TIL underwater construction can be achieved by creating dry work areas underwater inside of an enclosed space called a cofferdam

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4MGN TIL the NCAA changed food rules to allow Division 1 athletes to have unlimited meals at school instead of just 3; and the change was probably due to UConn’s guard Shabazz Napier telling reporters he often “went to bed hungry.”
VB0Nk TIL that the terms "upper case" and "lower case" come from the literal cases of metal letter pieces used in typesetting.
Bggmr TIL that the packaging colour for air-dropped humanitarian ration packs had to be changed from yellow to salmon after someone realised that the same shade of yellow was also used for air-dropped cluster bombs.
px4b TIL Alaska has more coastline than the rest of the United States combined
VjaD TIL in a 1980s Nike commercial, a Kenyan tribesman’s words were translated as “Just Do It”; however, American anthropologist Lee Cronk alerted Nike that the Kenyan really said, “I don’t want these. Give me big shoes.” Nike responded back saying “We thought nobody in America would know what he said.”