The years from about eight to twelve constitute a unique period of human life..

Puberty for a girl is like floating down a broadening river into an open sea..

Civilization is so hard on the body that some have called it a disease, despite the arts that keep puny bodies alive to a greater average age, and ou….

The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity..