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TIL water is not colorless. The pure water has a slight blue color that becomes a deeper green as the thickness of the observed sample increases. The blue hue of the water is an intrinsic property and is caused by selective absorption and scattering of white light.

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loJQG TIL that the astronauts of Apollo 11 were refused life insurance, so they signed photos of themselves so that their families could auction them for money in case the landing failed and the crew were killed.
D1lDD TIL in 1912, Teddy Roosevelt survived an assassination attempt, went to his speech instead of the hospital, then continued on to roast the assassin in his speech.
Md8W TIL : Quotation marks differ based on the language “english”, «french», „german“ or »german«, ”swedish”, …
OoBo6 TIL the McRib is sold year round at McDonald's in Germany and has been a permanent menu item since 1985
9Ee6 TIL of Slavisa Pajkic, a man who was born with no sweat glands. He and his brother are able to withstand thousands of volts of electricity running through their bodies(or through their skin). Scientists are unable to explain the phenomenon