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Excerpt from:
Helen Keller Says -- We Don't Know How To Think
DR. FREDERICK TILNEY, Professor of Neurology at Columbia University, says that the brain of normal people is used to just one-fifth of its possible capacity! The fact that the blind and the deaf can keep informed as to the world about them, can enjoy books, flowers, music, and live as happily as anyone with all his faculties is a challenge to those who have five senses....