Crash, boom, bang: destroy! There's nothing children love more than the satisfying smashing and bashing of things being demolished. They always do it for sheer amusement; now they can do it in the name of science. And they'll enjoy it so much? that they won't even think they're learning physics as they're wrecking stuff. Just imagine the expression on kids' faces as they watch a microwaved marshmallow grow bigger?and bigger: up to four times its size...