In sixth grade, I had an interesting science teacher. After our late-year lesson on simple machines - levers, pulleys, screws, etc. - we were offered a challenge: Create a device that used a simple machine in some fashion to launch an egg as far as you possibly can. The boy and girl that flung their eggs the farthest would be treated to a nice dinner out with the teacher.
The game was on! I came up with a few crazy designs on paper, but basically stuck to the same principle - using compressed air. Yeah, ok, not much of a simple machine, but in the end there wasn't much to the device beyond a simple lever.
My dad got a giant tank of compressed air and attached a valve to it (the lever), and to the valve, we attached a long clear plastic tube. As you might guess, the tube was the diameter of an egg....
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