http://www.theatlantic.com/business/archive/2015/06/why-humans-speak-language-origins/396635/
An evolutionary biologist argues that humans started talking because they needed to negotiate.
Why We Speak
http://www.theatlantic.com/business/archive/2015/06/why-humans-speak-language-origins/396635/
An evolutionary biologist argues that humans started talking because they needed to negotiate.