Here's why:
* Sign languages are not universal: There are hundreds of different sign languages, each with its own unique structure and grammar. This is because they developed independently in different communities.
* Sign languages are constantly evolving: Like spoken languages, sign languages change over time, adapting to the needs and experiences of the communities that use them.
* Sign languages are not simply gestures: While sign languages use gestures, they also have their own complex grammatical rules, vocabulary, and syntax.
So, instead of asking who "discovered" sign language, it's more accurate to ask:
* How did sign language evolve?
* Who are the key individuals who have contributed to the development and preservation of sign language?
The development of sign language is a complex process that involves the contributions of countless individuals throughout history. Deaf communities have played a crucial role in shaping and preserving their own sign languages.