When Did Humans Initially Begin to Speak?

On how language evolved in Africa...

What speech sounds were made by humans when they first started speaking, when did language develop from those simple beginnings, and when? People have always been intrigued by these issues, particularly as they relate to the history of modern humans and what distinguishes us from other animals.

The majority of George Poulos' academic career has been devoted to studying the phonetic and grammatical structures of African languages. He offers fresh dates for the development of language in his most recent book, "On the Origins of Human Speech and Language."