Today, I'm going to show you how to make a lemon clock. To make a lemon clock, you need some lemons, two is probably a good idea, you need quite a bit of color to make a clock work. Incidentally, you could use other fruits to do this. You could use oranges, you could use potatoes. Citrus fruits work well because they're nice and juicy and it's the juice that is an electrolyte and it allows electricity to flow through it, so that's the way lemons work particularly well. To make our lemon clock, we're going to use some zinc nails, okay, so you need something with zinc on it and you need something with copper on it because those are the two terminals that you need to make a battery out of the lemon. So, you just stick your two zinc nails into two lemons and you stick your two copper electrodes. These need to be as pure as possible copper that you can find. You can probably get them from some kind of gardening shop or some kind of plumbing shop but pure copper works well. And then you need to use your cocktail clips to connect the two batteries together. So we usually connect one end one up battery to the other end of the other battery. Now, the copper terminals are the positive end of the battery and the zinc terminals are the negative end of the battery so I'm connecting the positive to the negative to connect the two together. Now, I'm going to put a black wire on the negative terminal of the battery, I'm going to put a red wire on the positive terminal of the battery. And then this is a clock, an old alarm clock that I've got and it doesn't work at the moment because I've taken the battery out of it. So I've taken the battery out, I've poured two wires out that connect to the battery. So it's not going to work. When I connect my battery, my fruit battery to it, alright, I'm touching the negative on to the negative end and the positive terminal on to the positive and you should see if the clock starts to work. You could change the time and set it if you want. It works fine. If I take one of the terminals off or disconnect, the circuit electric circuit we've got here, will anyway and then the clock will stop working and if I connect it back together again, the clock will start working then. So what we've made is a battery really out of two bits of fruit and two metal electrodes. And it's important not to be scared of lemons and think that they are full of electricity and you can't eat them. Because it's not the lemon that's got electricity in it, it's the fact that we've got chemical reactions going on between a piece of copper and a piece of zinc in the liquid that's inside the lemon that makes the battery. And that's how you make a lemon clock. .