San Bushman in Namibia. Linguists say the 'click' sound used in San speech may have been a feature of the proto-language.

Linguists seek a time when we spoke as one

A controversial research project is trying to trace all human language to a common root.

Nice article (CS Monitor) forwarded to me by Paul Saffo on the search for a single proto-language from which all others came. In the last seven years of the Rosetta Project our data has been used by linguists to try and prove out this theory including the work at Sante Fe Institute mentioned in the article.