 Step right up, ladies and gentlemen. It is I, Makita Yakov, the world's greatest magician. Come, let me boggle and astonish your mind. I will leave you flummoxed like a raspberry on a fence, yeah? You, sir, yes, you only stripe atop. You look like Urban Tiger. Come, let me show you something. Are you really as good as I say you are? But of course I am. Would you expect anything less from a man who wears cape and hat? I suppose not. So what can you do? Well, observe. I have here a pack of multi-colored cards. Then a multi-colored? Silence. Fool. Now, your task is to set these into a six by six square. Okay. Do it. Hurry, boy, hurry. I have not all day to prepare trick. Come faster, faster. Move your digits. This is too easy. Allow me to add another row and column. Now, while I face an opposite direction, you take one of these cards and flip it over. Then I turn around and reveal which card you flipped. All right, turn around then. Done. This is your card. I know, because I am great. Incredible. So how exactly did you do that? Excuse me? You think a magician as talented as I am going to give you my secrets? Come on. I promise I won't tell anyone. That's very interesting. Yes, it is. But shall I tell no one? Or there will be trouble. Do not mess with the great Makita Yakov. Step right up, step right up. I'm Triva, the greatest magician in all the world. Allow me to amaze you with my magic tricks. You won't believe your eyes. They're so magic. Magic trick, eh? Yes. What I need you to do for me is to lay out these squares in six rows of six. Sure. Faster now. I don't have all day. I'm a magician and I have other people to do magic for. Quick, quicker, quicker. All right, that's good. And let me add another row just to make it a wee bit more. When I turn around, you will flip one of the cards over. I'm turning around. And when I turn back, I will tell you which card you flip. Oh. What do you call this? I thought I told you never to repeat my glorifying magic to anyone. I was teaching him how to play chess. Yeah, chess. No, what I meant to say was I was showing them how computers store data using binary digits. Zeroes and ones. See, see this square, it represents what's called a bit. A bit? Yeah, a bit, which is short for binary digit. And sometimes these binary digits gets flipped and then the computer has to realise there's an error and work out which bit it needs to fix. I am furious, like pigeon eating cricket bit. I told you, never to mess with a great Makita Yako. Now my collection is a little bit bigger. The secret of my trick is revealed at csunplugged.org where it's called error detection. But don't go showing anyone, for if you do, you too may be joining my fabulous team of bits.