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TIL that everyday flour can be a propellant for an explosion. If a cloud of flour reaches a critical concentration in the air it forms an explosive mixture.

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OG5R4 TIL there is a philosophical idea called solipsism which says that only one's mind is sure to exist; everything from the external world and other minds cannot be known and might not exist
lW8r TIL Students who dated in Middle School are four times more likely to drop out of school and report twice as much alcohol, tobacco and marijuana use than their single classmates.
9LLp TIL The eBay secondary market for Nike shoes is conservatively estimated at $230 million which would represent 8.5% of Nike earnings for 2014. Nike is happy this market exists and isn’t trying to stop it because the sneakerheads that drive it spread the Nike gospel better than they can.
7rvoO TIL about Polish photographer Zofia Rydet, who at the age of 67 began her project 'Sociological Record' to document every household in Poland. She took over 20,000 photographs before her death in 1997.
kOBAg TIL a teenager rappelled from the roof of a car dealership, stole chef Guy Fieri's Lamborghini Gallardo Spyder, and managed to keep and use the car for over a year before being arrested on an unrelated attempted murder charge which led to recovery of the vehicle.