You know these things? You can buy 'em, but they're oh-so-easy to make. What's not so easy, is getting a real photo that demonstrates what is happening, so I'll tell you: they stomp the bottle and the burst of air causes the rocket on the end of the pipe to shoot up in the air surprisingly high, usually eliciting much excitement and laughter from the little ones. You can find the instructions here, at this great website, www.sciencetoymaker.com.
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