Volunteers were played the sound of a drill while their brain activities were watched by a machine.
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Related: drill
Prev: The laser, with its beam of strong light, can drill a hole in a diamond, and yet can be so well controlled that it can be used in delicate eye operations.
Next: Since 2006, in France, an unknown gang of thieves have been emptying supermarket safes, using nothing more than a drill and a modified vacuum cleaner.
