In 1986, newly discovered love letters revealed a marriage hidden in the shadows for more than 30 years. Before moving to America in 1933 with his second wife (and first cousin), Elsa, Albert Einstein had married his university sweetheart and scientific collaborator: Mileva Maric, a courageous young woman of exceptional intellect. This remarkable, forgotten woman contributed substantially, as both wife and scientific equal, to Einstein's great scientific achievements.