DO IT YOURSELF

Build a soap-powered boat

1 First, fill the large bowl with water and put it on the bench.

2 Cut your boat out of the foam food tray, making the shape in the picture. The craft should be about five centimetres from front to back, and about four centimetres wide.

3 Dip the toothpick into the liquid soap and smear some around every exposed edge of the boat.

4 Now, put the boat gently on top of the water in the bowl and watch as it zooms away!