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TIL of William Kamkwamba, who taught himself to build windmills from library books. He built his first windmill, at age 15, out of junk from the scrap yard and brought power to his Malawian village. Later on he built another windmill to power water pumps to irrigate fields.

VBOkB TIL coral reefs are worth $2.7 trillion annually
695yJ TIL that there was a radioactive toothpaste on the market in Germany prior to WWII.
9YGyD TIL that PhD students display twice as many symptoms of psychiatric disorders such as depression than other people.
8eB18 TIL that Riga built a community for blind people
wy0W TIL Uganda is the “youngest” country in the world. Half its population is under 15, and 75% of its population is under 30.