Who's worse? The dictator who leads one of history's greatest waves of terror or the political schemers who put him in power for their own selfish ends? Read on and judge for yourself.

Vintage images help reveal the surprising origins of the first guide dog school ever that still operates in New Jersey to this day.

From why they use Viagra to why we once drank their urine, these panda facts reveal everything you never knew about nature's most mysterious bears.

From the shocking ticket prices to the sad halftime show, these Super Bowl 1 facts and images reveal just how much has changed over time.

From the book he died reading on the toilet to the one person who's been allowed in his bedroom, these Elvis Presley facts reveal rock's weird side.

These serial killer quotes from monsters like Ted Bundy and Charles Manson will haunt your nightmares and reveal the darkest depths of human evil.

Be it time travel or, god forbid, spaghettification, these are six leading theories on what might happen to a person if they go inside a black hole.

After Ignaz Semmelweis first advocated for hand-washing to fight infection in the 1840s, doctors had him committed to an asylum. He soon died there from an infection in his hand.

Plus: Antarctica is actually gaining ice, but there's a reason scientists still aren't jumping for joy.

Plus, new studies show which foods are the most addictive and the shocking extent to which bacon increases cancer risk.

Discover these astounding space colonies designed by NASA in the 1970s and the Mars colony they're plotting now.