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I wonder why zippers have teeth and other questions about inventions – Which computer was as big as a bus? Why are bears called Teddies? What do people use before they had fridges? With detailed, lively answers to these and many other fascinating questions, I wonder why zippers have teeth is a perfect introduction to the world of inventions. Combining incredible information with awesome artwork it is guaranteed to amaze and inspire. 
Overview
"What did people use before they had refrigerators?" and "Where do inventors get their ideas?" are some of the questions answered in this intriguing look at inventions.
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