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TIL that NASA first confirmed the existence of water on Mars in 2008, when the Phoenix lander became the first man-made object to touch and sample true water on Mars.

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via reddit.com

RoeQ TIL the Fahrenheit system was designed with the freezing point of brine as 0 degrees, 32 degrees as the freezing point of water, and 96 degrees as the temperature of the human body. The difference between 32 and 96 was useful for instrumentation at the time (64 can be bisected 6 times).
78ZPx TIL that the horror cliché of zombies eating brains dates back to the 1985 horror-comedy film “Return of the Living Dead”, in which the zombies didn’t eat brains out of hunger, but instead because it eased the "pain" of being a zombie.
GAv4 TIL That you can actually improve the grades you make on a test by studying the material in the place you’re about to take the test.
Morm TIL the lowest class of meat called ‘Canner’ is used for dog food… and school lunches.
KNdQ TIL more than 3.5 million people experience homelessness each year in the United States and 25% of this number are children under the age of 18.