jmichaelg writes: "The BBC is running a rocket contest to see who can build the fastest 2 liter water bottle propelled vehicle. The idea is you use a bicycle pump to pressurize the bottle to drive the vehicle. There are pressure limits (no more than 70 psi) so dry ice is out of the question. Gotta use a bike pump. Fastest car to go 20 meters is the winner. If you're going to play, you had better get going ... contest ends on Nov 6." Bonus points if you're riding it at the time.
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