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TIL of the 1077th Anti-Aircraft Regiment, a Soviet unit of mostly high school-aged female volunteers that fought a Panzer Division with anti-aircraft guns in the defense of Stalingrad.

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d1EZ TIL of the Steller’s sea cow. At up to thirty feet long, it was one of the largest mammals to have ever lived. It was famous among sailors because its meat was reportedly delicious and lasted for months without spoiling. Within twenty seven years of its discovery, it was hunted to extinction.
Zdda TIL that NASA mathematician Katherine Johnson calculated the trajectory for the space flight of Alan Shepard by hand, and was called on by NASA officials to verify the computer’s calculations of John Glenn’s orbit around Earth.
WkBeB TIL that A 1983 April Fools' Day edition of the Durand Express, reported that "dihydrogen oxide" had been found in the city's water pipes,and warned that it was fatal if inhaled,and could produce blistering vapours.The dihydrogen monoxide parody involves calling water by an unfamiliar chemical name.
0wbMR TIL of the H - Index. A ranking of scientific authors and scholars according to productivity and citation impact of publications. It also takes into account things like obtaining the Nobel prize, being a research fellow or holding a high position at a university. Albert Einstein has an H index of 44
VMZjp TIL By bringing light to a focus, a telescope forms an image — a little picture floating in the air inside the tube. Eyepieces makes it possible to view that image and changing eyepieces determines a telescope's magnifying power