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TIL a hypothetical black hole with a size of just 0.2 millimeters (1⁄127 inch) would have the same mass as the Moon

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via reddit.com

b665N TIL a study found that playing World of Warcraft for 14 hours over the course of two weeks may boost cognitive ability among seniors between 60 and 77 years old.
6EV8Z TIL Scientists accidentally discovered that grazing animals prevent grasslands from becoming desert after they killed thousands of elephants to try and conserve remaining grasslands, yet it actually made desertification worse. When they increased the number of grazing animals it restored the land.
l7GX7 TIL female bats of some species are able to store sperm inside their reproductive tracts for several months. In this way, they can mate in the autumn but conceive in the spring, and thus avoid raising young in the middle of winter. Some animals can store sperm for years.
BrjQx TIL Michael Jackson was terrified of the real-life fan who inspired the song Billie Jean, after she sent him a letter with a weapon and instructions to kill himself. He kept her photograph to memorize her face, “in case she ever turns up someplace.”
0wka1 TIL the first animal to ask an existential question was from a parrot named Alex. He asked what color he was, and learned that it was "grey".