(Left) Helen Keller and Anne Sullivan Macy in 1913 and (right) Dr. Maria Montessori, c. 1910–15 Library of Congress

(Left) Helen Keller and Anne Sullivan Macy in 1913 and (right) Dr. Maria Montessori, c. 1910–15 Library of Congress

(Left) Helen Keller and Anne Sullivan Macy in 1913 and (right) Dr. Maria Montessori, c. 1910–15
Library of Congress