Teach them electronics

And after they go to bed, have fun.

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kits

I wonder how well it would combine with this.

Snap circuits are already out there, and are really cool too. Possibly cooler, because I think you can combine them in more ways.

Oh yes, Minifob loves his SnapCircuits.

Anyone working with electronics is strongly advised to get this most useful tool. A solderless breadboard such as GS-830 from Global Specialties. An equivalent one is even available in Radio Shack.