Construct a powerful rocket from simple materials. Using a balloon, a straw, and pieces of plastic, you can create a rocket in a matter of minutes. Ready the rocket for launch and watch it to soar through the sky as the . . .

Create a complete working clean energy system from start to finish. With this revolutionary kit, you will build an entire miniature renewable energy system using water electrolysis and advanced proton exchange membrane t . . .

Own a car of the future -- A palm sized racer, this miniature zero emission vehicle operates on 100% clean fuel. Using advanced technology, this race car comes complete with its own fuel cell and on-board hydrogen stora . . .

Cool Re-creation for the Rocket Enthusiast -- This SpaceShipOne is a large, 1:15 scale version of the famous Ansari X PRIZE winner. Its launched by a powerful Estes E engine and is an actual replica of Burt Rutans design . . .

Gear up for a fun activity kit using motors to build ten different mechanical devices. Build a working fan, a spinning game wheel, a conveyor, train, car, and more. -- Ideal for science fairs, you can construct and deco . . .

Imagine the worlds most efficient engine design running off the heat of your coffee mug. -- When the heat expands the air, the air pushes up on the piston. When the air cools, it contracts, pulling the piston down. This . . .

This vehicle travels on land or water. The multiple function switch (solar or battery) allows this kit to be energized day or night, indoors or outdoors. Its scientifically structured catamaran design reduces water resis . . .

Build a rugged wood chassis racing car. -- Features metal roll cage, steerable front wheels with suspension that really works! Selectable 2-speed gearbox, forward/stop/reverse. Requires 2 "AA" batteries (not included). S . . .

The Highest RPM Engine We Carry! -- This unique model steam engine has a vertical, double-acting oscillating cylinder engine with a 2-1/2 x 6 boiler, a 3-speed pulley, and a 400 watt heater. It includes pop valve, whistl . . .

1/4 Scale Operating Model Kit -- Powered by hand crank, no batteries are required. As you turn the crank at your own speed, each of the parts move. -- Engine rests on a black stand, which may be painted. Distributor and . . .

A Do-It-Yourself Model Steam Engine -- -- An American tradition, this solid brass and nickel plated steam engine is perfect for learning more about mechanical energy, motion and the way "things work". -- -- The steam . . .

Currently Being Investigated as an Alternative Power Source! -- The Stirling Engine was first produced in the 1800s as a non-electric fan and an automatic hot-air water pump. It soon became obsolete due to its lack of su . . .