Unexpected sisterhood

Some southern Italian dialects are very different from the rest of Romance languages. They show characteristics that are totally unexpected for the Romance group. Surprisingly, the same characteristics are found in languages as distant as Basque, Georgian, Maya, Hindi, Nez Perce, and so on. How is this possible?
Under the assumption that languages vary indefinitely one from the other, such structural similarities are completely unexpected. Studying these languages, that are about to disappear under the pressure of Standard Italian, allowes us to find strong evidence for the hypotheses that languages cannot vary indefinitely, but that they must show basic similarities because they are all produced by the same conceptual and syntactic device, which is active in our brain.

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