Risking it all in the name of physics, Sampson goes up against one of the world's deadliest weapons. Facing an AK-47 rifle underwater, he must trust the extraordinary power of resistance in the water to stop the bullet before it hits him.

Todd Sampson tries to defy gravity by scaling a 13-story building with nothing more than two vacuum cleaners strapped to his back; the invisible force of air pressure could mean the difference between life and death.

Todd Sampson takes a deadly leap of faith; in a dangerous bungee jump, his life depends on the strength of two phone books weaved together.

Todd Sampson tries to defy the deadly power of fire and dives into a blazing-hot inferno. With nothing but a thin layer of water to protect him, science could mean the difference between life and death.

Todd Sampson takes an incredible flight powered by 130 massive helium balloons. In this dangerous experiment, Todd must use science to defy gravity and make it safely back to the ground.