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TIL of Becky Schroeder, who was issued her first patent when she was 12 years old. Granted in 1975, her patent was for the glow in the dark backing sheet. The "Glow Sheet" would be used by NASA astronauts, nurses and sailors to write in the dark

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Bgywk TIL that fingerprint analysis relies on human judgment. Computer databases can identify potential fingerprint matches, but it's up to trained fingerprint examiners to determine if a match is accurate, and examiners can come to different conclusions.
epxRb TIL Wired telegraph sounders didn't emit beeps. Instead, the signal was fed to an electromagnet which caused a spring-loaded lever to emit clicks for "on" and "off"
g517 TIL of the Peter Principle; anything that works will be used in progressively more challenging applications until it fails. Applied to a workplace, this means “every employee tends to rise to their level of incompetence”.
EgOx0 TIL that there is a device called the Nasal Ranger that allows for the quantification of how smelly an odor is.
X0r0j TIL Gabe Kaplan -- Mr. Kotter on "Welcome Back Kotter -- went on to become a professional poker player and, for many poker fans, the definitive poker TV "color" commentator, before retiring earlier this year