Throughout the 20th and 21st centuries, a number of women have helped get the American electorate acclimated to the idea of a woman in the Oval Office. Here are four female presidential candidates you should know.

We often take the age a girl starts her period for granted. But history shows us that since Medieval times, that age has been getting steadily lower.

Believe it or not, women originally started wearing heels to appear more masculine.

Unique to humans, happiness is one of the hardest emotions to define or understand. What do we really know about the science of happiness?

Cold War spies, Aztec conquerers and Roman senators — history shows anyone could be a traitor.

Forced to work for the notorious Dr. Josef Mengele at Auschwitz, Gisella Perl risked all to save as many lives as she could. This is her incredible, heartbreaking story.

Who's to say that horror should only be consumed by adults? These scary stories for kids will make you want to sleep with the light on.

Discover one of the weirder theories to be made about what the heart can do in this examination of organ transplant memories.

Not even two months after Lincoln's 56th birthday, he was shot dead. Those near the president in his last moments suffered some pretty eerie fates.

Most people know who Rosa Parks is — here are four other women in the Civil Rights Movement whose names you should know.