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TIL estrogen is responsible for the "masculinization" of male brains in early development. Newborn female mice exposed to estrogen will even go on to exhibit male behavior, such as mounting other female mice. Estrogen also plays important roles in memory, stroke prevention, and overall brain health.

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BrgDr TIL gender can now be determined from the concentration of amino acids in a fingerprint (levels are significantly higher in the sweat of women than that of men). The testing method can be performed at the crime scene and works in a manner similar to pregnancy strips or glucose meters.
e0V0L TIL That Preying Mantis do not follow you with their eyes. The pupil that seems to watch you is an effect generated by their nonmoving eyes when your field of vision lines up with one of the many cone shaped structures that make up their eye allowing you to see down the hole.
9YPm7 TIL that Sweden tries to ward off Russian submarines from violating its maritime borders by lowering a neon sign depicting a thrusting 'gay' sailor underwater. The sign also sends a message in Morse code which says, "this way if you are gay".
l7jZa TIL A re-edit of the pilot episode of Battlestar Galactica was released theatrically in 1978 in Canada before the television series aired in the United States, in order to help recoup its high production costs.
DQgYp TIL the BBC once forbade employees from illuminating any workspace solely with an Anglepoise (the spring-tensioned balance-arm lamp) because Variety Dept. head Michael Standing feared low-wattage lights led creators to furtive ideas, smut innuendo, and degenerate programme material.