Comment: you might supplement this witha cheap breadboard and some LED's

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you might supplement this witha cheap breadboard and some LED's

and other components. Nothing teaches like hands on experience. 20-30 bucks spent on these items will teach your kids a world about electronics. If you have a HAM radio try reaching out to people around the world (if you don't have a HAM radio get a kit for advanced electronics and build one. Mathematics should be fine as long as they are challenging themselves, but for mental math play cards or dominoes where they need to calculate quickly mentally; my father did this, and I won several math competitions as a result. Mostly teach them some history, especially world history regarding the rise and fall of the Roman empire, and other empires. Once they see the pattern there will be no holding back their interest in history.

Josh Brueggen
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