Adam donates the use of his feet in a firewalking experiment investigating why it is that some people can stroll over a bed of hot coals as if they're taking a walk in the park. Karl brutally subjects members of the studio audience to hot chillis then tries to break a glass with some very bad singing. Not to mention the extraordinary story of Mike the headless chicken.

Adam puts his maths brain aside when he subjects himself to hypnosis and Karl explains exactly what déjà vu is. We also see gorillas in the mist as the Geeks explain how our perception of the world is heavily filtered through a simple test with our studio audience.

This week the Geeks take a look at men's wandering eyes compared to women's, how early women begin their propensity to talk, and how Leonardo da Vinci really was a dirty old man. The Geeks also clear up a myth-conception in the War on Error. It is not possible for a man to get pregnant. Then there are some well overdue facts about picking your nose.

Adam and Karl test out their fortitude in flight with the Roulettes and we see what it's like to experience the sensation of zero gravity. As one of the Sleek Geek range of products the Geeks also offer a simple device to avoid ever being zapped.

Karl and Adam look at the fundamental nature of ice and how it's unusual properties enabled life to begin. More important still is discovering the best way to keep beer cool in an esky and savouring the exotic delights of Adam's urine and bathwater. And if that doesn't kill you, then maybe drowning will. Karl and Adam explain the real story behind rips. What they, how they work and how you can spot one.

Rips -