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TIL - Onasemnogene abeparvovec, sold under the brand name Zolgensma, is a gene therapy used to treat spinal muscular atrophy. Its famous because of its price of 2.125 million dollars a treatment.

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xV79o TIL whales earwax acts as a hearing aid. The wax has a similar density to water and allows sound to travel through the ear canal into the inner ear unimpeded—something that would be impossible if the ear was filled with air.
e0le5 TIL of the Sodder children disappearance. The Sodder family still believes that 5 of its children who disappeared after a fire burned their house in 1945, were actually kidnapped by Mussolini in retaliation to George Sodder’s criticism of his regime
OGJX1 TIL of Lei Tai. An Ancient Chinese form of Gladiatorial Combat/Entertainment where a local champion fighter builds a stage in the town square and invites anyone to knock him off the stage using any unarmed martial art. The winner then gets to "own" the stage, and issues a similar challenge as well.
5VBp8 TIL that on the day he was assassinated at least nine of Kennedy’s Secret Service agents were recovering from an all night bender that ended at 5:00 AM
9YXNp TIL about the blanket octopus, named for the sheets of thin webbing between its arms. Females can reach over 6' (1.9m) in length, while males are approximately the size of a walnut. This is the most extreme case of sexual size dimorphism found in nature.