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Gr 4–6—This panoramic view of significant inventions covers everything from a 1.5 million–year–old hand ax to futuristic Masdar City, a carbon footprint–free metropolis in the United Arab Emirates, scheduled to be completed in 2030. Grouped several per page and more or less chronologically within seven color-coded categories such as "space," "communication," and "at home," entries each include a...Log In or Sign Up to Read More