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By: Maria Doty | Published: May 09, 2011

Hilde Mangold, previously Hilde Proescholdt, was a German embryologist and physiologist who became well known for research completed with Hans…

By: Ellen M. DuPont | Published: Jul 23, 2008

John Spangler Nicholas, an American biologist, was born on 10 March 1895 in Allegheny, Pennsylvania. He was the only child of Elizabeth Ellen…