Ok, I confess I'm a bit of a science geek and have a big warm spot for science education. It doesn't take much to convince me to buy anything that can be justified as teaching the kids about science.
I recently discovered the PowerMagenetStore. Magnets are, of coure, one of the coolest things to play with and this place sells N38 Neodymium rare earth magnets. I ordered 18 of them for £13.25 and they quickly arrived in the post.
They are incredibly strong. A 1/2" cube easily holds up Jenny's wok (not that she appreciated it). Let two 1/2" cubes stick to each other and it takes a major effort to seperate them. These magnets can crush fingers and pinch skin very badly. I've let the kids play with them a little but they have to be strictly supervised. These magnets can easily kill credit cards, monitors, watches and other devices.
Next step is to come up with some fun experiments and demonstrations of what these things can do. There are lots of ideas on Dan's Data, WonderMagnet or Bill Beaty's page.
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