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TIL that humans can detect individuals that are blood-related kin through the sense of smell (Olfaction). This is thought to be an evolved defense against incest.

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bKL9 TIL The first recorded instance of a man “giving no fucks” was George Tucker in 1790. Writing about his son’s bookish tendencies, his poem says “I’d not give a fuck for all you’ve read”.
0emp TIL North Korea’s economy was larger than South Korea’s until the 1970s. Today its GDP is about 2.5% the size of South Korea’s.
XEkVk TIL Robert Frost's "A Road Less Traveled" was intended to be a humorous jab at an indecisive colleague. The poem's intent was to convey how both paths are basically the same with the same outcome, so you should just select one randomly and get the fuck on with it already.
kOKE5 TIL Color blindness isn’t common in females because there’s a low likelihood that a female will inherit both genes required for the condition. However, only one gene is needed for red-green color blindness in males. Globally, 1 in 12 males and 1 in 200 females are colorblind.
D15Pj TIL that New York City is one of four major cities in the United States whose drinking water is pure enough not to require purification by water treatment plants. The city is supplied with drinking water by the protected Catskill Mountains watershed.