Hi MmeZeeZee,
you can also look at http://www.ted.com/talks/annmarie_thomas_squishy_circuits.html , there is a wonderful think like squishy circuit. It looks like a better thing for younger childs. You can mix it with more ambitious skills to teach and your kids ar not frustrated when they make it "allone" .... 
.
Thomas
PS: Here is the original source: http://courseweb.stthomas.edu/apthomas/SquishyCircuits/index.htm