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TIL Birds aren't actually blue, but appear to be due to an optical illusion caused by light interacting with the 3D structure of their feathers.

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0wxlL TIL The bacteria that is responsible for the smell of blue cheese is the same one that is responsible for foot and other human body odours.
p8xmp TIL the idiom "take with a grain of salt" dates to 25 AD and refers to an antidote to poison. To take a poison or an idea with a grain of salt means to reduce it's effectiveness.
VMrJp TIL that all male U.S. citizens (and male residents) must register for military conscription ("Selective Service") within 30 days of their 18th birthday. Failure to register is a felony punishable by a fine of up to $250,000 and/or 5 years imprisonment.
jNRja TIL in Iceland, if you don’t know the address to where you want your mail to go, you can hand-draw a map to your destination on the envelope
oXBY TIL of Dean Karzanes, the man who can run 350 miles without stopping due to a genetic condition.