Unless these steps in advance are to end in distraction, some clew of unity, some principle that makes for simplification, must be found….[T]he needed steadying and centralizing factor is found in adopting as the end of endeavor that attitude of mind, that habit of thought, which we call scientific….[T]he native and unspoiled attitude of childhood, marked by ardent curiosity, fertile imagination, and love of experimental inquiry, is near, very near, to the attitude of the scientific mind….[T]o appreciate this kinship…would make for individual happiness and the reduction of social waste…