Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
These are remarkably powerful magnets for their size - one magnet can hold up one piece of paper on our fridge. That doesn't sound like much, but they're tiny! More importantly, you can fashion them into some neat patterns.
None. But I wouldn't have them around small children, they're powerful enough and small enough to hurt if they go places they shouldn't!
We wrapped a coil of wire around a straw, hooked its ends up to a volt meter, and pushed a 'cylinder' of the magnets into and out of the straw, so my son could see how magnets moving past a conductor generates current! Worked really well.
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