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TIL birds have two lungs and two additional air sacs which allow breathing to continuously flow in a single direction through their respiratory system. This allows oxygen intake even when they exhale, which is especially needed at high flying altitudes.

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9R8B TIL it was only after the 2000 election that the colors red and blue became associated with the Republican and Democratic parties, respectively.
N70xJ TIL illegal income (bribes, etc) are considered taxable income. Authorities can use this to go after people with diplomatic immunity since they are not immune from paying taxes.
J1Ma1 TIL opossums always give birth to an odd number of babies, because they have an odd number of nipples. All other mammals have typically have an even number of both.
oRO9r TIL that ingredients shown on packagings are written in order from the most to the least of it
4XON6 TIL that "Xmas" is not an attempt to remove "Christ" from "Christmas", but rather a shortening to the Greek letter chi, which is the first letter in the Greek spelling of Christ.