With U.S. crime down yet prisoners up, and private prisons raking in billions off their labor, it's becoming increasingly clear that American slavery has returned with a new name.

This Pew report reveals the fastest growing religion in the world. The answer will likely surprise and, sadly, terrify many in the U.S.

Compare that with video of the flexible phone we'll all have in five years.

From its secret apartment to the time it was sold for scrap (twice!) the tower has quite a history.

The Airlander 10, the long-awaited behemoth that is now the world's largest aircraft, has finally been unveiled. Join us in a first look.

What's more impressive about the Millau Viaduct, the world's tallest bridge? Its colossal size or the astounding engineering behind it?

Find out the happiest country in the world, not to mention the unhappiest country, and whether or not the world itself is actually happy.

From the man who memorized its first 70,000 digits to the insane true length of the number, these pi facts will make any math fan happy.

These famous inventors don't actually deserve credit for the inventions that made them famous. Here's who we should be remembering instead.

North Korean leaders isolate the country from the world in many ways, and controlling the Internet is one of their best methods of all.

This desert has been changed utterly in the last two decades, and it's still going on.