75% of individuals who knows sign language aren't familiar with its history. Ever wondered how sign language started? The origin of sign language. The earlier means of communication among hearing-impaired individuals
This book explains it all!!!.
It will interest you to know that the well-known American sign language (ASL) does not originate from the US. Yeah! You got that right. To know its true origin then get a copy. learn more about a language you understand;
For starters, it would also help you get familiar with sign language in no time.