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TIL that the smiley face was invented way back in 1963 by Harvey Ross Ball an American graphic artist

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4jkR TIL of Ishi, a Native American who had been living in the wild and only encountered modern civilisation in 1911. He was the last of his tribe, the Yahi people.
wow7M TIL it's estimated that half of the current world population is alive because we are able to make nitrogen fertilizer at an industrial scale using the method developed by Fritz Haber and Carl Bosch.
X0kxP TIL if you cut down a cactus in Arizona, you can go to prison for 25 years. This is similar to cutting down rare trees.
xVWVw TIL that KFC once tried to expand into new core competencies with KRB, Kentucky Roast Beef
Bb9L TIL that the sexual attraction to mid-to-late adolescents, ages 15-19, is called ephebophilia and not pedophilia and is considered scientifically natural.