About this book
Provides the answers to over 100 questions about machines, such as "How old is the cannon?", "How does a machine help astronauts walk in space?", and "How did the Cold War create the Internet?"
Themes & subjects
MachineryMiscellaneaJuvenile literature
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![[William Wheeler Hubbell, authorized to apply for patents.]](https://covers.openlibrary.org/b/id/10200621-M.jpg#w=1280)
