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NASA is developing a subvocal speech system that could enable you to make a phone call while keeping your lips sealed. How do you talk to someone without opening your mouth? Psychics call it telepathy. NASA refers to it as subvocal speech. Scientists at the NASA Ames Research Center in California have developed a system of tiny sensors that read nerve signals in the throat that control speech. You may not make a sound when, say, you read silently, but your nervous system is buzzing with activity. Recently, they used the system to make the first subvocal cell phone call.