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TIL that the famous Jeopardy "Think!" theme was composed by the show's creator Merv Griffin in less than a minute as a lullaby for his son. By 2005, he had made over $70 million dollars in royalties from that song, the equivalent of a Jeopardy contestant winning every game for about a decade.

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awdYM TIL that Ultraviolet blood irradiation (UBI) was extensively used in the 1940s and 1950s to treat many diseases including septicemia, pneumonia, tuberculosis, arthritis, asthma and even poliomyelitis.
awa1b TIL about the deadly Poison Fire Coral fungus (native to Japan, Korea, and Australia) that can cause the brain to shrink if consumed.
R5xg8 TIL on James Cameron's 3rd dive to the Titanic, he & his pilot had "a near-death experience". They encountered a sandstorm on the ocean floor & became temporarily stuck there with low power supply & few batteries. It took them 3 attempts from the bottom to rise above 25 meters & surface 5 hrs later.
91em TIL Some fleas in a Flea Circus were glued to a base of a circus enclosure. Miniature musical instruments were then glued to the flea performers and the enclosure was heated. The fleas fought to escape, giving the impression of fleas playing instruments.
oBrjo TIL bloodhounds (a.k.a. nose with a dog attached), have 230 million olfactory cells – 40 times that of humans. Because of their sense of smell, their evidence is admissible in the court of law. Bloodhound, Nick Carter, led to the capture and conviction of more than 600 criminals throughout his life.