Over time, people make changes to languages they use for a pretty simple reason: to make communication easier, a study of American Sign Language suggests.

"Informal observations of Deaf infants interacting with their Deaf parents have suggested that these infants possess keen control over their eye-gaze behavior."

The new technology can translate much better than other currently available devices.

"Sign languages are more expressive than spoken language because they combine the same kind of logical resources with far richer iconic means."