Facing an AK-47 rifle underwater, Todd Sampson trusts the extraordinary power of resistance to stop a bullet before it hits him.

Todd Sampson takes a leap of faith by bungee jumping with two interwoven phonebooks, and nothing but the friction between the pages arresting his fall.

Todd Sampson puts the law of conservation of energy to the ultimate test by releasing a one-tonne wrecking ball centimetres from his face.

Harnessing the incredible power of air pressure, Todd Sampson attempts to climb a 13-storey building with nothing but two vacuum cleaners strapped to his back.

Putting his faith in the science of buoyancy, Todd Sampson ties himself to a giant cluster of helium balloons in an attempt to defy gravity.