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evolution. This is it. This is exclusively left as left to language, but it does suggest that the ability to think symbolically. And by language, it could be a byproduct of an officially networked brain. Sophisticated and rapid neural processing is what we needed for language and changes in connectivity may have been what made that possible. Once these connections were in place, language felt very, very fast. For instance, prior to 1970, Nicaragua, an Nicaragua example here, didn't have any sign language. Kids that were deaf were not sent to school and had little to no contact with other deaf people. In the early 1980s, the government opened schools for deaf children in the schools.