Inside The Minds Of History's Greatest Personalities

Throughout his life, Abe Lincoln suffered through many tragedies; losing his mother at the age of 9, losing two young sons to disease, and the Civil War. He was even known to talk about ending his own life.

Between the months of February 1981 and her wedding, the Princess' waist size decreased from 29 inches to 23.5 — the size of an average 8 year old girl.

Traits such as retreating from people while in persistent thought and focusing intensely on topics that interested him have led scientists to believe that Einstein is on the Asperger's side of the Autistic Spectrum.

A man of enormous achievement both in film and aviation, Hughes demanded perfection from his films. At one point he insisted using authentic airplanes for his film scenes instead of replicas.

Known as a worrier, Darwin constantly fretted about his children, work, deadlines, his reputation, and most constantly — his health.