"Rosie the Riveter" is regarded as a feminist icon today, but the image on which it was based had nothing to do with feminism.

Stanley Milgram's obedience experiment sought to find out how easily the average person could be induced to commit heinous crimes under orders. They found out — with disturbing results.

Millions of people have spent the last two decades spouting alternative ideas about what may have happened on September 11, 2001, but are any of these 9/11 conspiracy theories even rooted in truth?

He participated in an infamous massacre of Union soldiers, but when he got to write his own story, Jesse James cast himself as the Robin Hood of the Wild West.

After a childhood of abuse and abandonment, Aileen Wuornos went on a killing rampage that left at least seven men dead across Florida in 1989 and 1990.

Inside the Aktion T4 program, the little-known euthanasia initiative that killed as many as 300,000 disabled people as the Nazis swept across Europe.

Neanderthals lived from about 400,000 to 40,000 years ago before they were replaced by modern human ancestors. People today can still have Neanderthal in their genes.

Some are convinced the government uses Area 51 to dissect aliens and study flying saucers. In truth, the classified site has been used to build spy planes — and dump toxic waste.

The Ustaše brutalized and massacred upwards of 300,000 Serbians, 30,000 Jews, and 29,000 Gypsies throughout their four-year reign of terror in Croatia.

After 10 years behind bars, John Dillinger went on a year-long bank-robbing spree that captured America's imagination.

These facts about the Leaning Tower of Pisa reveal everything there is to know about the world's most famous architectural mistake.