“So far as I know,” writes Carl Sagan, author of The Dragons of Eden—Speculations on the Evolution of Human Intelligence,a “childbirth is generally painful in only one of the millions of species on Earth: human beings.” This is because of the comparatively large human skull, which, in turn, was required by the increase in the size of the human brain, or more particularly, of that part of the human brain known as the neocortex. The neocortex is the largest and most dominant part of the human brain. To it may be traced those characteristics which we regard as most […]
