(SOUNDBITE) (Arabic) 5-YEAR-OLD CHILD TEACHING SIGN LANGUAGE TO ONLINE FOLLOWERS, AWS OUDAH, SAYING: "I make these videos to enable people to communicate with people with hearing impairments, so they ...

Sign language is a language you express by using your hands and face instead of spoken words. It’s most commonly used by people in the Deaf community. How many types of sign language are there? There ...