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TIL in an effort to demonstrate time dilation, a father and his kids drove three atomic clocks up Mt. Rainier. The measured effect was just over 20 nanoseconds, matching Einstein's theory of relativity.

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v1V0L Today I learned Adolf Hitler was a 'super junkie' whose veins collapsed after thousands of injections according to Award-winning German writer Norman Ohler
M0mV TIL when you remember things from a 3rd person view (typically your oldest memories), it’s called an Autobiographical memory
DQBBY TIL that the Northern Mockingbird can mimic the calls of over 25 other bird species
X0Oxj TIL in 1915 a farmer saw his sister make her own mascara with coal and petrolium jelly and thought he could make a better product. His invention was easier to apply and won't burn a woman's eye. He named his new company Maybelline after his sister Maybel and the base material Vasaline.
gMExD TIL that, during their years in the White House, President Herbert Hoover & his wife, First Lady Lou Henry Hoover, were known to communicate with each other in Mandarin Chinese at times when they wished to foil eavesdroppers & keep their conversations private.