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TIL that snot becomes yellow when you're sick because of chemicals released by white blood cells that are in the mucus to fight infection; green snot indicates even higher levels of those chemicals

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7rRWP TIL the term "ZIP" code is actually an acronym for Zone Improvement Plan, was introduced in the 40's only for large cities, and was a signature mark for the USPS to give the impression that the mail would "zip" along faster if citizens used it.
DBDP TIL there is such a thing as one-way bulletproof glass. This allows you to return fire through the glass while still keeping you protected from the attacker (your shot leaves a bullet-sized hole, but doesn’t compromise the rest of the shield).
xBlb TIL: A mother sickened her son by feeding him massive amounts of salt (eventually killing him) because she liked the attention she got on Twitter, Facebook, and other social media for having a very ill child.
gbZL TIL In the Netherlands road constructors are by law obliged to do 20 years maintenance, hence now they make the best roads in the world
OD6a TIL There are 6 mathematical problems still unsolved to this day. A correct solution to any one of the 6 will make you $1,000,000 richer. The 6 problems are often referred to as ‘The Millennium Prize Problems’.