 What we want to do is to collect some oxygen as a liquid, and to do that we're going to use liquid nitrogen that has a lower freezing point. We're going to pour it into the cup and liquid oxygen is actually going to condense on the outside of the aluminum cup and then we'll catch it in the styrofoam cup. What you see here are two very strong neodymium magnets. And what we want to do is we want to position them close together but not too close. You'll notice how strong they are to get too close. They'll actually pull that whole ring stand over and they're difficult to pull apart. So we're going to position them just close enough to create a magnetic field in between them.