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TIL that Socrates' famous quote about the misbehaving youth in ancient greece originates from a dissertation of a Cambridge student in 1907. Kenneth John Freeman wrote about education in ancient greece and his work wasn't properly cited afterwards.

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6E9ll if the Sun were 'shut off', Earth's surface temperature would drop by a factor of two about every two months. The current mean temperature of the Earth's surface is about 27 °C / 81 °F. This means in two months the temperature would drop to -123 °C / -190 °F, and -189 °C / -324 °F in four months. So basically except some bacteria seem to be capable of surviving at extremely cold temperatures in space, we humans would die pretty quickly.
QJDEL TIL Discover Magazine was created when Time editor noticed that magazine sales jumped every time the cover featured a science topic and interpreted this as a considerable public interest in science
XEwJR TIL that MI6 agents were encouraged to use semen as invisible ink, with the motto “every man his own stylo”. The practice only stopped after concerns were raised about the masturbatory habits of the agents.
Wn5d TIL the Super Soaker inventor is a Tuskegee-trained NASA engineer who used the money earned from a toy to do research on solar power and batteries
mx0EY TIL when the Hoover Dam was being drafted, the engineers calculated that it would take 125 years for the concrete to cool if done in a single pour. Instead they poured it in sectioned blocks, some as big as 50 square feet and 5 feet high.