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TIL People with sensitive noses are capable of smelling when it's about to rain due to atmospheric chemicals reacting and creating ozone, which has a pungent, sweet smell.

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e9pJ TIL that purple as a color is similar to violet, but violet is a spectral color with its own wavelength on the visible spectrum of light whereas purple is a composite color, made by combining red and blue.
KOx0J TIL - professional cutmen in professional fighting make upwards of 15% of the fighters purse and many are worth millions.
OKRY TIL Gladiators carried out product endorsements in the arena. Ridley Scott left this tidbit out of the movie “Gladiator” for fear that this would seem anachronistic.
B46e TIL that Pitch is a viscous liquid which flows extremely slowly. In an experiment started in 1930, only 9 drops have dripped; the latest being April 17, 2014
waQP TIL American eugenics movement considered gas chambers and actually gave TB-infected milk to mental patients…