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TIL the closest living relatives of hippos are cetaceans, which includes whales, dolphins and porpoises.

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QrMe TIL that Strontium-90, an isotope emitted from nuclear fission, is chemically similar to calcium. This means that when it is inhaled after a nuclear blast, the body uses it as it would use calcium, depositing it straight into your bones where it delivers beta radiation to your bone marrow.
0LdR TIL that words such as moose, skunk, raccoon, pecan, and squash, all originate from the language of the now-extinct Algonquian tribe, which inhabited what is now Roanoke Island.
VBkrk TIL that in 1957, the town of Pleasanton, Texas voted overwhelmingly to desegregate its public schools. The vote (and entirely peaceful subsequent integration of African American students) bewildered the press and gained national attention as it occurred around the same time as the Little Rock Nine.
QNdle TIL of the artwork Tilted Arc, a 120 foot long and 12 foot high piece of metal, which caused a public debate in Manhattan as many people thought it was ugly. It was removed in 1989 and has not been displayed in public since in accordance with the artist's wishes since the piece is site-specific.
Z8wp4 TIL a farmhouse in Gettysburg was used as field hospital. There was so much blood on the floor, that there is still dried blood between floorboards. When under a blacklight, large bloodstains are still visible