I’ve got a cup of water… …piece of paper… …and we’re going to turn this upside-down, and not have the water come out. Now, this is one of those ones that either works or it doesn’t… … so you probably going to want to have something to catch the water… so you don’t make an entire mess. This is about air pressure but for now I’ll show you how it works first and then we’ll explain, how, how, you know what to do first and then we’ll explain how it works. So, don’t make your paper too big. Make it not much bigger than the opening that you think you’re dealing with. Another trick, don’t have too much water. The more water you’ve got inside there, the heavier the container’s going to be, and when you turn the thing upside-down you’re risking the whole thing just ‘plopping out’. Now, put that on top…flat… put your hands flat… put over something that’s going to stop you from losing all the water. And, I’m about to find out whether I’ve done it right… Around we go… Keep your hands there for a little bit and then very carefully take your hand away.