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Today I learned that Dead Reckoning is a form of navigation that relies on eye-sight, a risky form of navigation.

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D1dAv TIL that president Andrew Johnson never attended school in his life, and wasn't literate until his 16 year old wife began tutoring him.
VBRYQ TIL Soviet cosmonaut Vladimir Komarov was the first man to die during a space-flight. He volunteered to pilot a hastily built and fatally flawed spacecraft alone in order to save the life of the man who would replace him if he refused — his close friend and first man in space, Yuri Gagarin
ePdD TIL studies indicate that 90% of doctors admit they would reject resuscitation by CPR if they had a choice, compared to 25% of the average public. This is attributed to research showing only 8% of CPR cases actually survive more than 1 month, nearly half of those in a vegetative state.
077M TIL that Michael Jackson would beatbox all the parts of his songs to the musicians for them to perform
Eg1ap TIL portraits of presidents were not depicted on the official currency of the USA until the beginning of the 20th century. The first dollars had the figures and faces of the characters of Greek and Roman mythology and pictures with the participation of Native Americans appeared on the money.