Known as the First Lady of the World, Eleanor Roosevelt was a leader in her own right and involved in numerous humanitarian causes throughout her life. She was one of the most active first ladies in history and worked for political, racial and social justice.

Thomas Edison had no small ego and liked to promote himself as a lone inventor. But you can't take out 1100 patents in your lifetime by yourself. Instead, he built the first research and development laboratory, decades before anyone else in America understood the value of such a collaboration.