These heartbreaking Jacob Riis photographs from How the Other Half Lives and elsewhere changed America forever.

In an attempt to understand a non-white life in America, John Griffin dyed his skin "black" and set off to the South. His experience, recounted in Black Like Me was, as you might expect, painful.

Ever since tales of Tantric sex reached the West, many have attempted to understand Tantra — and have gotten it very wrong.

From his champion wrestling career to the eerie circumstances of his assassination, these facts about Abraham Lincoln may change the way you see the 16th president.

In 2013, a synthetic stimulant called flakka emerged in Florida — and wreaked havoc on users with its horrific side effects.

Better known as devil's breath, scopolamine more than lives up to its name.

Joachim Kroll, the "Ruhr Cannibal," terrorized West Germany for over 20 years, eating the flesh of his victims because "meat was expensive."

From the streets and saloons of mining towns to the ranches and cowboys out on the plains, these Old West photos capture the frontier as it truly was.

Eleven months ago, Cameron Underwood was without most of his lower jaw, his nose, and all but one of this teeth.

These profound Sun Tzu quotes reveal his wisdom and explain why people are still reading "The Art of War" more than 2,500 years later.