This program examines factors that contributed to the diversification and spread of languages, including early migration, the introduction of agriculture, and genes. Language transfer from mother to child and from one population to the next is also investigated, along with the concept of dialects and commonalities among the world's more than 6,000 languages.

In various languages with English voice over translation ; optional audio description, and expanded audio description (with English SDH subtitles) ; Title on disc and container: Speaking in tongues: the history of language. Episode two. Constant change.

1 DVD ; The story of Babel Fox P2 Language change Dialects The linguists.