国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 9月1日 01時59分

Today in 1870: Italian educator Maria Montessori is born.
This 1966 arithmetic learning kit was designed by Catherine Stern, a physicist and founder of a Montessori school in her native Germany. She designed these materials in New York City, where she moved in 1938 to avoid Nazi persecution. #backtoschool #math #todayinhistory

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