Some aspects of language may also be universal to people who create their own sign languages, according to new research in Psychological Science.

How great that hearing people are learning sign language (15 January, p 27). How sad that the signs aren’t the same all over the world. If legend is correct, the early peoples of the Americas ...

Another version of sign language is pro-tactile sign language, and that's specifically for people who are deaf-blind, people who cannot see signs signed out in space, ...