A handbook for bored, thirty-something children (like myself) on how to make potato cannons, tennis ball mortars, catapults and the like from the comfort of their garden shed.
Twelve projects from the ridiculously easy to the fairly time consuming, packed into 169 pages of juvenile playhem. Good instructions, clear pictures and photos, and all done with the emphasis on safety.
There is also a fair amount of explanation concerning the actual physics behind the projects and a look at historical figures such as Newton and Archimedes.