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TIL that a 2006 study concluded that prehistoric predators had excellent vision, surpassing modern birds of prey. Compared to a bald eagle (whose vision is 4x better than ours), Tyrannosaurus rex had eyes that were 13x as precise as a human’s eyesight, meaning it could see prey from 6 km away.

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9Y69m TIL in the 1980s the Naval Investigative Service misunderstood the euphemism "a friend of Dorothy" and believed there was actually a woman named Dorothy at the center of a massive ring of gay military personnel. They searched for her in the hopes she would reveal names of gay military members.
VMoPm TIL there's a psychological disorder called "Sunday Night Blues" and it reffers to the anxiety some people (specially workers and students) feel thinking about the start of a new week.
8eXYL TIL not all species die of old age. Some animals such as hydra, planarian flatworms, and certain sponges, corals, and jellyfish exhibit potential immortality.
mv8P TIL High heels were originally designed for men in medieval europe to assist with horseback riding.
E1gAx TIL that 19-yo Tom Lyle Williams created the mascara "Maybelline" in 1915 when his sister Maybel used a mixture of VaseLINE and coaldust to darken her eyelashes after a mishap.