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TIL Ornithologists believe birds rub ants on their wings as the formic acid that the ants release may kill feather lice

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VBnpD TIL the biohazard symbol didn't symbolize or refer to anything originally. It's simply a shape that was picked as being symmetrical, hard to mistake, and easy to remember
R5M7w TIL that sometimes, (part of the) Danube flows into the North Sea via a system of sinkholes and a tributary of the Rhine
GxRN TIL despite political rhetoric, immigration from Mexico into the U.S. is at it’s lowest level in over two decades
E1bm0 TIL that Mississippi had no official state flag from 1904 to 2001 due to a legislative oversight. In 1906, Mississippi repealed all general laws that were not reenacted by the new code. The flag statute was inadvertently omitted.
G8bG TIL the 1945 Food and Nutrition Board Paper often quoted statement “humans require roughly 2.5 liters (8 glasses) per day” is only ½ of the full statement. The other half was “we get most of the fluid we need from food and other beverages.”