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TIL while trying to find a cure for AIDs, the Mayo Clinic made glow in the dark cats.

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xVkJo TIL that the american flag "code" prohibits using the flag "for any advertising purpose" and also states that the flag "should not be embroidered, printed, or otherwise impressed on such articles as cushions, handkerchiefs, napkins, boxes, or anything intended to be discarded after temporary use".
OOAL TIL concrete can be made translucent by incorporating optical fibers in merely 4% of its volume. The material feels and behaves just like concrete, but allows light to pass through.
kOykg TIL in 1984 a pair of brothers were surprised when the fictitious, “Johnny Klomberg”, they made up for a Baskin Robbins free birthday ice cream list, received a Selective Service notice by mail a few years later reminding “Johnny” that he was almost 18, and it was time to register for the draft.
VoQ4 TIL in the medieval times animals could go to trial. In 1457 a sow and six piglets were charged for killing a 5 year old boy. The mom was deemed guilty, the piglets’ role, however, was ambiguous. Although splattered with blood, they were never seen directly attacking the boy.
OoOj4 TIL that a device called a 'Teasmade' was popular in the 60s and 70s in the UK, an alarm clock which also made tea, ensuring it was ready upon waking up.