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Short answer: It’s easy to learn and hard to master

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RB6j [TIL] As lemon juice is used to make invisible ink, a man tried to rob a bank thinking he was invisible by putting lemon juice on his face.
9YMQ TIL, Lang Hancock (Gina Rinehart’s father) suggested forcing aboriginals - to collect their welfare cheques from a central location: “And when they had gravitated there, I would dope the water up so that they were sterile and would breed themselves out in the future.”
5VP19 TIL: The image where the tongue folds the tip backwards and goes all the way into the nasal passage way is real- its name: Khechari Mudra.
PYJgG TIL American Sign Language and British Sign Language are not mutually intelligible. While English speakers can understand each other across the Anglosphere, deaf people from different English speaking countries are unable to understand each other.
69yGl TIL that a sphincter muscle, similar to the one humans use to hold in gases, prevents water from entering the blowholes of marine mammals.