Exploring the earth and the cosmos
the growth and future of human knowledge
1.4 hrs read
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About This Book
Tells the story of how people have learned and continue to learn about their world, covering explorations, discoveries, inventions, theories, and speculation.
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!['X' Stands for Unknown [17 essays]](https://covers.openlibrary.org/b/id/7145555-L.jpg)
