Human brains may have shrunk about 3,000 years ago as collective intelligence grew, researchers suggest.
For most of human evolution, the story of the brain seemed to move in one direction. It got bigger.
That long rise is still there in the fossil record. But a new analysis argues that the trend did n… [+7977 chars]
That long rise is still there in the fossil record. But a new analysis argues that the trend did n… [+7977 chars]