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TIL more than six billion different knot types have been identified by mathematicians and scientists since the 1800s.

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woEj1 TIL At one point Walgreens made a chain of restaurants called Wag’s that operated from 1975-1991
XEyBR TIL that in 1983, after a mid-air collision, an F-15 pilot continued flying and made a successful emergency landing, only to find out after he landed that he lost the entire right wing in the collision.
jwVE TIL that composer Hans Zimmer has never had any formal music training.
EwNX TIL that as of January 2013 47 houses in Detroit were listed for $500 or less, with five properties listed for $1
QNV6p TIL the first exoplanet was only discovered in 1992