Elsa Einstein was Albert Einstein's second wife as well as his first cousin — and she remained married to him despite his frequent affairs.

Russian physicist Anatoli Bugorski is the only person known to have been directly exposed to a nuclear particle accelerator beam — and survive.

Described as the "perfect psychopath," Pedro Rodrigues Filho murdered at least 70 people — 47 of whom were fellow inmates in prison.

Starting in 1791, Alexander Hamilton had a year-long affair with Maria Reynolds. Five years later, he published "The Reynolds Pamphlet," detailing how she and her husband had extorted him.

When Adam Rainer turned 18 he was under four and a half feet tall. A little more than 15 years later he would be 7'1" — tall enough to be classified as a giant.

Colleen Stan became known as the "girl in the box" after she was held prisoner by Cameron and Janice Hooker inside their California home between 1977 and 1984.

In July 1951, Mary Reeser mysteriously burned into a pile of ashes in her Florida home, but the apartment around her suffered almost no damage, leading to theories that she had spontaneously combusted.

Christopher Scarver didn't like Jeffrey Dahmer's crimes. So on November 28, 1994, in Columbia Correctional Institution, he did something about it.

Mary Jane Kelly was an enigmatic figure with a mostly unverified story. What was clear, though, was the horrifying nature of her murder.

After fleeing Nazi Germany in 1938, William Hitler became an American citizen, changed his name to William Stuart-Houston, and joined the U.S. Navy, where he was awarded a Purple Heart during World War 2.

Mel Ignatow killed his girlfriend Brenda Sue Schaefer in 1988 and managed to get away with it. Two decades later, however, he met a grisly fate eerily reminiscent of that murder.