HONOLULU (AP) — Linguists say they have determined that a unique sign language, possibly dating back to the 1800s or earlier, is being used in Hawaii, marking the first time in 80 years a previously unknown language — spoken or signed — has been documented in the U.S.

Researchers will formally announce their findings this weekend showing it's not a dialect of American Sign Language, as many long believed, but an unrelated language with unique vocabulary and grammar. Read more...