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TIL a power plant in Lanai, Hawaii generates electric via diesel trains, still on the tracks.

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jm9E TIL of the Aka tribe in Central Africa where male and female roles are virtually interchangeable. Women hunt, men mind the children,and vice versa. Men spend 47 percent of their time within reach of their kids, more than any other society, and even let them suckle.
OovNg TIL the integral of the secant formula, important in cartography, has been found accidentally when a mathematician was running through numerical approximations known at the time and recognized they matched ln(|tan(phi/2 + pi/4)|). It took 28 more years for someone find a formal proof
m1rAO TIL that when Nikita Khrushchev visited America in 1959, he gave an impassioned speech where he complained about not being allowed to visit Disneyland.
vL9j TIL the mushroom (Phallus indusiatus) can make a woman orgasm spontaneously by smelling it
9Yk8D TIL about the "nocebo" effect, which is the opposite of the placebo effect. This was demonstrated when a man tried to OD on antidepressants and required IV treatment for low blood pressure, which returned to normal when he was told the pills were fakes