What you need: I used the following. 1 Battery AAA some Magnet wire 2 Wires Some tape 3 Magnets from my Curiously strong magnet set.
How to do it:Well this is the first installment of the DIY series. This one was borrowed from: Make and Gonzo Gizmos (Scitoys). There are a couple of good sites to look up for projects to do yourself. A few that I know of: MakeSciToys (Maker of Gonzo Gizmos) Hacked Gadgets Hack a Day