We all scream for ice-cream.
There's nothing better on a warm day than a nice scoop of ice cream. A quick trip to the freezer, and you have a refreshing treat. You may even have a machine at home to make your own. Plug it in, and off it goes. People have been enjoying ice cream long before freezers were invented. They used a simple bit of GCSE science to make their dessert though you still need ice to start the process. Before freezers, ice was collected from frozen lakes in winter and stored underground in ice houses. These could be natural caves or cellars dug into the ground. Beneath the earth, it stays cooler than on the surface, so the ice stays frozen long into the summer. The other thing you will need for your ice cream is salt. That's it; ice and salt. No electricity or fancy equipment. Just plain old ice and salt. Of course, you will also need your ice cream mixture ready to freeze. You will need a large and small bowl to make the ice cream. The ice goes in the larger bowl, and the ic...