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Ultrasonic speakers let people who are blind read Braille in mid-air



People who are blind can read Braille in mid-air using their hands thanks to a grid of speakers that emit ultrasound waves. The device creates points in the air that are similar to the dots that form Braille characters.

“On the skin this feels like a gentle breeze of air,” says Viktorija Paneva at the University of Bayreuth in Germany. The mid-air dots are perceptible on a person’s palm when they hold their hand up about 20 …