USA Today --A group of Boy Scouts in Des Moines, Iowa, built an cannon capable of launching a ping pong ball through a watermelon at supersonic speeds.
A pack of 10 and 11-year old Cub Scouts made a 10 foot long supersonic ping pong ball cannon made out of PVC pipe.
Turns out the experiment was much more powerful than expected.
Photo Gallery:Pictures of the Boy Scouts' experiments
The ping pong ball was clocked at 880 miles an hour- faster than the speed of sound!
The cub scouts spend the rest of the afternoon mopping up the bigger than expected mess.
But the did earn their engineering activity badge and a whole new appreciation for science.
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