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TIL that prairie dogs construct their burrows in such a way that wind blowing parallel to the ground induces flow of air through the burrows–renewing oxygen supplies underground.

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WWL8 TIL the mystery Dum Dum flavor is a mixture of the end of one batch and the beginning of the next so production can seamlessly transition.
E1pKw TIL a Japanese zoo unsuccessfully tried to mate a pair of hyenas for four years before realizing both were males.
8XgG TIL that AOL still has 2.4 Million paying monthly subscribers. They made AOL $196 Million last quarter which accounts for one third of their overall revenues.
W7EwN TIL about the Aldgate Pump in London, a drinking fountain responsible for the death of hundreds when its water became contaminated by running through nearby graveyards.
VBJoD TIL Americans invented the Internet, but a British man invented the World Wide Web.