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When two black holes collide, the noises scientists hear are birdlike.

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4XJLN TIL Brøndby Haveby is a series of circular neighborhoods outside Copenhagen that act as vacation homes for nearby city dwellers
beVN TIL baseball player Roberto Clemente died in a plane crash on New Year’s Eve 1972 while trying to deliver food and relief supplies to earthquake victims in Nicaragua. He had exactly 3,000 hits in his professional career.
Zy14 TIL the YKK on my zipper stands for Yoshida Kogyo Kabushikikaisha (which means Yoshida Company Limited). They make 7 billion zippers each year.
OG9rg TIL of the Beneš decrees, laws which allow Slovakia to steal property from its ethnic Hungarians. The post-WWII era laws came from the former Czechoslovakia, where it was used to take property and citizenship away from ethnic Germans and Hungarians, and subject them to forced labor.
O56e TIL it is the tradition in Sri Lanka for children to throw their baby teeth onto the roof of their house in the presence of a squirrel.