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A Little Device That's Trying to Read Your Thoughts

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Stephen Hawking's glasses

Stephen Hawkings glasses pick up twitches in his cheek.

Credit: Howard Guest/Reuters

Already surrounded by machines that allow him, painstakingly, to communicate, the physicist Stephen Hawking last summer donned what looked like a rakish black headband that held a feather-light device the size of a small matchbox.

From The New York Times
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