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I second language. Many of you said the internet, or electricity powering the internet. But the power of the net is still about communication, just on a larger scale. the internet is a tool to facilitate communication, but it still involves input by people. Put a monkey in front of a computer, and it won't communicate any better. Moveable type just allowed communication to be portable and permanent. Language allowed the spread of ideas. On a primitive level, look at the animals and insects that use communication to survive. Bees tell others in the hive where nectar is at. Ants follow each other by pheremones to food or danger. Dogs can read body language like that. Monkeys use screeches, howls, and other noises to communicate. Our brains are so highly developed to handle the ability to process verbal sounds. Some scientists believe that language caused this brain growth, not brain growth causing language. The primitives who could communicate better lived longer. Think about it. We have no claws, no sharp teeth, we are slow, our babies take years to develop, we have no prtective fur, but we dominated every environment by being able to work together and communicate.
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