Hi, I'm Steve Bozy from the University of New England. Now let me just explain to you what I've got here. I've got a power supply that's capable of delivering a very large electrical current. It's connected by two large cables to this apparatus here. What we have is ten floppy wires that are capable of carrying a very large current. And they're connected in parallel so that when I turn on the power supply, I'm going to have a very large current travelling in the same direction down all ten of these wires. Now can any of you out there predict what's going to happen when I turn on the power supply? Let's give it a whirl. Try again. Now those of you that weren't concentrating on this bit of apparatus may have noticed something strange down here. Okay, can any of you explain that and that? Now what I hope that you observed was that the wires became pinched together as the current passed through them in the same direction. So this reason that effect is sometimes called the pinch effect. Now here's another interesting thing that might be related. What I have here is a copper pipe that was found about a hundred years ago and it was part of a lightning conductor. So a lightning conductor is a metal pole that's sometimes erected on the top of a tall building and then connected to the ground electrically so that if it gets struck by lightning, that lightning is conducted safely into the ground. So what do you think happened here?