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TIL there are 177,147 ways to tie a necktie. Mikael Vejdemo-Johansson, a mathematician in Stockholm concluded this number by trying each possible way.

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eP75 TIL that the most profitable item on McDonald’s menu is its fountain drink. It costs between 13 and 18 cents to produce a drink. Therefore, when you buy a fountain drink for $1.00, they are gaining more than 80% profit per fountain drink.
rR7Eo TIL that the final “You’re safe now” scene in Captain Phillips was never in the script but was added on the fly and ad-libbed. The staff of the infirmary were actual crew members of the USS Bainbridge, did not know they were going to be in the movie and just reacted to Hank’s acting.
16g7V TIL that Copenhagen's only ski hill, CopenHill, was built on top of one of the world's cleanest waste incineration plants
eBlL TIL that Gandhi’s great-grandson lives in Topeka, KS, is a retired heart surgeon, and was recently elected to the state house of representatives (as a Republican)
e0KJ6 TIL of Tom Attridge, a Grumman test pilot who managed to shoot himself down while in an F11F Tiger after entering a steep dive and catching up to rounds fired prior to the dive (which slowed down due to air resistance). With his engine and windshield damage, he was forced to crashland but survived.