The first explanation put forth by the humans-are-so-fabulous crowd was that only humans use tools, but we know that chimps, birds and other animals also use tools. Our tools are much more advanced, but is that really what makes the difference?
Many animals communicate using sounds, but our language is much better. And here is where many scientists agree: not only is the human language ability better, it is unique in its ability to expand. Once we learned to talk, we just kept talking until our brains got very big. None of us, individually, needs to be very smart--as a group we just get smarter and smarter, and this allows many of us to just talk and talk with no actual intelligence at all.
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