When William Addis was sentenced to prison in the late 18th century, he occupied himself with an unheard of task: perfecting the world's first mass-produced toothbrush.

Violets, touch me nots, and squirting cucumbers all have one thing in common: They disperse their seeds by exploding. Here's some incredible footage of each one in action.

The bog-preserved corpse of Croghan Man had well-manicured nails and a leather-plated armlet. What could this tell us about his role in an ancient society?

In the 1880s, LaMarcus Thompson was troubled by America's slide into hedonism and immorality. Out of that concern, we got the rollercoaster.

They may be the size of bottle caps, but poison dart frogs store a toxin 200 times stronger than morphine in their skin.

No one knows for certain why the Lalibela churches share many similarities with Judaism, but scholars propose a handful of holy theories.

Three hours into her weekly cruise around the Mediterranean, Costa Concordia crashes into an outcrop of rocks, sending passengers into a frenzied panic.

After Muslims conquered Egypt, they build the Nilometer, a tool to measure the country's biggest, wettest source of revenue.

Reaching speeds up to 18 MPH, the sidewinder slithers rapidly along the desert dunes. The way it buries itself in the sand is even scarier.

Art Historian Nicholas Allen has a radical theory about the image on the Shroud of Turin; he believes it was the world's first photograph, taken 500 years before the known invention of photography.