Devices such as levers, hinges and winding mechanisms are really important for all kinds of practical things, and they are used to make various toys and tools that move.

Find out how the power of water alone can lift a bucket. Or you can use a tin can, a ruler and a piece of string to pick up a small object. You can even design and make an angry, snapping alligator out of a load of old lollipop sticks.

So let's explore the mechanical world!