Mega Shark

A massive prehistoric shark may be hiding in North American waters.

History of Valentine's Day

In this episode of History of the Holidays, learn the history of Valentine's Day. Learn about St. Valentine, cupid, and why the holiday is celebrated on February 14th. Valentine's Day brings in about 14 billion dollars annually.

Super Scooter: Part 1

Mike's and Frank's strategy of picking -- buying and negotiating -- becomes clear as they use a motorcycle sidecar part found at an earlier pick to help close the deal on a rare, valuable Vespa Ape scooter.

Science Fiction, Science Fact: Part 1

Warp speed, transporters, wormholes and lasers--they are all staples of science fiction books, movies, and TV shows. With advances in technology this fantasy world of tomorrow could become the futuristic world of today.

Sahara: Part 1

A series of geological discoveries have reavealed that the Sahara Desert hides a different past then originaly thought. Scientists have unearthed fossils that lead them to believe that the hottest place on the planet was once a freshwater lake.

Yosemite: Part 1

The Sierra Nevada, North America's highest mountain range, contains Yosemite Valley. Walled by sheer 3000 foot granite cliffs and made from one of the toughest rocks on earth, it is home to the mighty El Capitan and iconic Half Dome.

Yosemite: Part 2

The Sierra Nevada, North America's highest mountain range, contains Yosemite Valley. Walled by sheer 3000 foot granite cliffs and made from one of the toughest rocks on earth, it is home to the mighty El Capitan and iconic Half Dome.

Yosemite: Part 3

The Sierra Nevada, North America's highest mountain range, contains Yosemite Valley. Walled by sheer 3000 foot granite cliffs and made from one of the toughest rocks on earth, it is home to the mighty El Capitan and iconic Half Dome.

Yosemite: Part 4

The Sierra Nevada, North America's highest mountain range, contains Yosemite Valley. Walled by sheer 3000 foot granite cliffs and made from one of the toughest rocks on earth, it is home to the mighty El Capitan and iconic Half Dome.

Yosemite: Part 5

The Sierra Nevada, North America's highest mountain range, contains Yosemite Valley. Walled by sheer 3000 foot granite cliffs and made from one of the toughest rocks on earth, it is home to the mighty El Capitan and iconic Half Dome.