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The Book of Potentially Catastrophic Science & Book to Build Toothpick Bridges - $15 (Oxford or Worcester)
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The book of potentially catastrophic science - Here are 50 awesome experiments that demonstrate the principles behind the 34 greatest scientific breakthroughs in human history. The wheel astound friends with an experiment that seems to defy the laws of gravity and more!
Masterpiece toothpick bridges - multiple bridge projects made with toothpicks.
Both new never used. Perfect for your little scientist or engineer.
$15 or best reasonable offer.
Mike