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TIL that the fastest recorded tennis serve was by Australian player Samuel Groth, at 263.4 km/h (163.7 mph) in 2012.

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ONZ1 TIL a 12-year-old boy spent 2 years collecting over 160,000 bottles after school and donated all the money he made ($2,700) to orphans in an AIDS epidemic region in China. He also donated his personal savings ($30) and collected 800 books to give to the children.
neoNG TIL Benedict Cumberbatch, who plays Sherlock Holmes on "Sherlock," is distantly related to Sir Arthur Conan Doyle, who created the character.
p8E84 TIL some customers are called “harbingers of failure” meaning if they buy a product it is more likely to fail.
bQQa TIL of “rubberbanding”, a way video games adjust difficulty. In Mario Kart and other racing games computer vehicles behind the player become much faster, and those ahead become much slower, as if connected by a rubber band with the player.
mXVR TIL that Fleshlight have an R&D department working on realistic prosthetic legs for Elephants injured by landmines in Thailand.