Challenge two: Snakes by a flame challenge

Test your science with this interactive challenge from the BBC/OU TV series Bang Goes The Theory

Having got out of the locked room, you now find yourself in a dingy underground lair extension. But how to escape? Ever mindful of health and safety legislation, your captors have made sure the exits are well-signposted. But being evil, they've not paid their electricity bill and you can't see the signs in the dark. You can see a big, sleeping snake, though. Can you make enough light to find the exit without waking the snake?

A new series of challenge will accompany the next series of Bang! Goes The Theory in March 2010.