Count down through the world's top 20 YouTube clips featuring brave human guinea pigs including: the US guy who flips cars and the Russian roof to roof jump.

From volcanoes and galactic mega storms to mineral rich asteroids and comets. Discover how these titanic forces and extraordinary phenomenon could reveal clues about the origins of life on Earth and elsewhere in the universe.

From volcanoes and galactic mega storms to mineral rich asteroids and comets. Discover how these titanic forces and extraordinary phenomenon could reveal clues about the origins of life on Earth and elsewhere in the universe.

From volcanoes and galactic mega storms to mineral rich asteroids and comets. Discover how these titanic forces and extraordinary phenomenon could reveal clues about the origins of life on Earth and elsewhere in the universe.

Adam Savage delves into an unpredictable world, taking on the most absurd challenges only he could dream up! He engineers inventive builds to discover new information.

Adam Savage delves into an unpredictable world, taking on the most absurd challenges only he could dream up! He engineers inventive builds to discover new information.

Scientist Rob Nelson investigates the world's strangest underground locations. He uses the latest technology and research to examine these mysteries.

Scientist Rob Nelson investigates the world's strangest underground locations. He uses the latest technology and research to examine these mysteries.

Ever wondered how everyday items are made? More common items are put under the microscope to find out.

Ever wondered how everyday items are made? More common items are put under the microscope to find out.