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TIL when Tracy Morgan was unavailable to finish recording the full-length version of “Werewolf Bar Mitzvah” for 30 Rock, Donald Glover stepped in and completed the verses in his impression of Morgan. Glover also voices the ‘producer’ on the track.

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9Ylmp TIL Dogs like classical music. In a study in 2003, shelter dogs were found to be more relaxed and quiet when they were listening to classical music. The dogs didn't seem particularly interested in pop music or radio shows but exhibited more barking when heavy metal was playing.
VBwvD TIL about Leonhard Euler (1707-1783) who not only popularised the use of lower case Pi to denote the ratio of a circle's circumference to it's diameter, but was also the first to use "i" to denote the square root of -1. The constant "e", the base number in a natural logarithm is the Euler Number
PMKe TIL The Google effect is the tendency to forget information that can be easily found using internet search engines such as Google, instead of remembering it.
X0pb8 TIL most birds in our world are monogamous
6l58 TIL: The launch of a Saturn V rocket is so loud, producing about 220 dB, that grass upwards of a mile away ignites by the sound alone.