Henrietta Swan Leavitt

Henrietta Leavitt was an American astronomer who discovered the relation between the luminosity and the period of Cepheid variables. This was a vital step in measuring the distance to remote galaxies.

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Helen Keller

Undeterred by deafness and blindness, Helen Keller rose to become a major 20th century humanitarian, educator and writer. She advocated for the blind and for women’s suffrage and co-founded the American Civil Liberties Union.

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