Kay wants to take computing forward with his next great invention, an operating system that puts the user in a three-dimensional graphic world with scores of other users, all computing collaboratively and communicating through audio and visual messaging.

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John Godber, Head of Products and Publications for the UK's Royal National Institute of Blind People (RNIB), says, "This is the biggest step forward for learning braille since the invention of the Perkins Brailler" in 1951.

ENGADGET: Perkins Smart Brailler helps the blind learn to type, closes the digital divide