化石证明,人的大脑约在一百万年前开始加速发展。最初,人脑的灰白质以每十万年增长一立方英寸的速度发展扩大;后来发展率倍增,再倍增,最后又一次倍增。到五十万年前增长率便达到了顶点。那时,大脑的灰白质以每十万年十立方英寸的非凡的增长速度而扩大着。在人类的生存史上,任何其它器官的发育都没有象大脑的发展这么快。究竟是什么压力使人的脑量如此迅速地剧增 Fossils prove that the human brain began to accelerate about a million years ago. Initially, the gray matter of the human brain developed and expanded at a rate of one cubic inch per 100,000 years. Later its rate of development doubled, then doubled, and finally doubled again. The growth rate reached its peak by 500,000 years ago. At that time, the gray matter of the brain expanded at an extraordinary rate of ten cubic inches per 100,000 years. In the history of human existence, the development of any other organ is not as fast as the development of the brain. What pressure actually makes the brain surge so rapidly