Wearable device turns user's thumbnail into a miniature wireless track pad

Researchers are developing a new wearable device that turns the user's thumbnail into a miniature wireless track pad. They envision that the technology could let users control wireless devices when their hands are full -- answering the phone while cooking, for instance. It could also augment other interfaces, allowing someone texting on a cellphone, say, to toggle between symbol sets without interrupting his or her typing. Finally, it could enable subtle communication in circumstances that require it, such as sending a quick text to a child while attending an important meeting.

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