The best part? She shares the recipes and concepts- you don't have to buy a book or kit or anything. We've all made play dough for class or home at one point time, these recipes are the common, simple recipes we've used! This engineer says children of all ages can learn and experiment with circuits in this fashion.
If your kiddo gives this a try, I would love to see and post photos of them with their circuits! Email them!
NPR interview, circuit diagrams and Ted talk:
Squishy Science Website: http://courseweb.stthomas.edu/apthomas/SquishyCircuits/