Today, people with severe hearing difficulties generally speak sign language, which enables them to communicate with other deaf people, and with anyone who knows how to sign. But because sign languages were developed autonomously in many separate places, there are actually over three hundred in use today. Some of these languages are closely related and at least somewhat mutually intelligible, but others are very different, so deaf people have the same issues with understanding people from diverse linguistic backgrounds as everybody else.
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Sign Language
