Snap Circuits are great for a kid interested in electricity-- easy to use for small hands and developing fine motor skills, and you can build very cool circuits (working radio, conductivity tester, lie detector etc). You can start with a basic kit (about $40 I think) and it is easy to add on to it with expansion sets if he loves it. My son loved it- I think he was five when he got the first kit-- and has accumulated more bits and pieces over the past couple of years. He knows way more than I do about resistors, switches etc and has had tons of fun.
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Thames and Kosmos science kits have also been popular in our house, as have the cheaper Science Wiz kits.
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If you do buy a microscope, there is a nice book by kids' science writer Shar Levine which has some good ideas of things to do with it-- how to make your own slides etc etc.
Edited by Cassidy68 - 4/24/12 at 9:46pm