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TIL that the crazy colors and patterns you see when you rub your eyes are called "PHOSPHENES." Researchers believe that this "biophotonic light" actually comes from inside of our eyes in the same way that fireflies emit light.

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VBJOm TIL that male dromedary camels have an organ called “dulla" they inflate from their mouth during mating season to assert dominance and attract females
d85kr TIL STOP is an acronym for a short mindfulness which stands for Stop, Take a breath, Observe, Proceed. Its an exercise that can be used when you feel stressed, overwhelmed or when you notice that your mind is just all over the place as a means to ground you back in focusing on what you were doing.
jdAp TIL the intro to “Iron Man” was achieved by having Ozzy Osbourne sing through a spinning fan. When the Guitar Hero team wanted to record a cover of the song, they bought the same model of fan through Craigslist to duplicate the effect.
eaE5 TIL in Japanese mythology, if an umbrella is left alone long enough it becomes a one-eyed, one-legged hopping demon known as Kasa-Obake
v0n4 TIL the cost of college textbooks in the US have risen more than 1,000 percent since 1977, even faster than tuition, health care costs and housing prices, all of which have risen faster than inflation.