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TIL that during WWI, there was limited supplies of cotton, so doctors used sphagnum moss for bandages. It can hold 22x its own weight in liquid and is a natural antiseptic.

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BrKnL TIL Ancient Roman spies used urine as invisible ink to write secrets between the lines of their official documents, hence the saying: "read between the lines." The messages appeared only when heated.
vj77 TIL China has more “excess” males (32 million) than Australia has people.
6EZpZ TIL that the digestive system is an "open" system because the mouth and the anus open to the outside of the body. Food technically is passing through us on the outside...
Yejv TIL research studies have shown that sandwiches actually taste better when other people make them for you.
0dN7N TIL 49 states (Washington is the exception) allow the removal and preservation of a dead person's tattoos