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TIL that Color-Changing Inks Can Be Printed onto Clothing to Warn the Wearer About Potential Health Issues

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mxdlE TIL that Beethoven overcame deafness by biting a metal rod attached to his piano to hear his work. It's called bone conduction, and can also be used to help divers talk and hear underwater, and is also used by elephants to communicate
W46X TIL African giant pouched rats are trained to detect tuberculosis, which is the world’s second most fatal infectious disease. Although they currently are not an accepted standalone diagnostic tool, one rat can evaluate more samples in 10 minutes than a lab technician can evaluate in 1 day.
6YZl TIL that a group called the Guerrilla Grafters illegally graft fruit bearing branches onto ornamental public trees in San Francisco.
M7Y4b TIL that in 1940 the Germans conquered Denmark so quickly that the Danes didn't have time to formally declare war against them. They surrendered after 2 hours.
m8Xv TIL In early 1900s America, “jay” was a slang term used to describe a naïve or foolish person. Thus, when such a pedestrian decided to ignore traffic signals and street signs, he or she was referred to as a “jaywalker.”