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Title: Very Disappointing
Review: We all were so excited when my son received this book for his birthday. We spent a nice afternoon with two teenagers making two different projects. The instructions didn't make sense, requiring you to make up parts or guess at what the author wants. And then, neither worked as advertised. One (tennis ball mortar) didn't work at all and the other (pneumatic rocket)required modification to get even the disappointing results we achieved. I would not recommend this book at all unless you already know how to do these projects. (But then why would you buy the book?)
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