On our capacity for language,
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This review is from: Bastard Tongues: A Trail-Blazing Linguist Finds Clues to Our Common Humanity in the World's Lowliest Languages (Paperback)
A very good read.
Since Medieval times it has been debated whether we have language ability built-in or not.
Since Chomsky the built-in'ers have had the advantage. This book is about the pidgins that are created, so that people without a common language can communicate, and the creoles which are complete languages created by the the next generation.