For deaf people, communication with the outside world is difficult; not many people know sign language. Designed to function as an automatic, instant translator, a new gadget called Uni may change this. Uni has a tablet and two cameras. If someone signs, the software translates the gestures into English, speaking in a Siri-like voice. If someone talks, it uses voice recognition to type the words on the tablet. “To many individuals who do not know what we are doing, it seems like magic,” says one of the founders, who are deaf themselves. They think the device can help open up new careers for deaf people.