Do it yourself projects are a lot of fun. This is a diy catapults site that has tons of interesting ways to build devices that toss, throw and catapult items far into the distance. Catapults are fun to build and they are also a great way to see physics in action first hand. Catapult blueprints offered for download and they even offer a design contest where you can win a couple hundred bucks for cool catapult designs you come up with on your own.

For more info on catapults click here!