In working on the links for "Backyard Science" on youtube, I came across something mentioned recently by an acquaintance. "Do Try This At Home" will definitely inspire Theo to many science antics. Shoot, I may actually have to make the paper jet engine myself!
Fortunately, Mr.G, the genius behind the show, organized himself a nifty youtube page. Go get inspired!
Here's the jet engine episode. Super cool!