Instructions

1. Fill the pie plate with water, about 3cm in depth.

2. Float the styrofoam in the middle of the plate.

3. Carefully stroke the needle lengthways along the bar magnet, around 30 times.

4. Gently place the needle on the styrofoam and watch what happens.

You will need:

- 1 iron needle

- A small piece of styrofoam

- 1 bar magnet

- 1 flat pie plate