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Seven Wonders of Transportation

From the Series Seven Wonders

In every age, science and technology have advanced human civilization. From architecture to engineering, medicine to transportation, humans have invented extraordinary wonders. Transportation… Read More →

  • ATOS: 5.7
  • Dewey: 629.04

Protecting Earth's Water Supply

From the Series Saving Our Living Earth

From roaring oceans to trickling streams, water covers seventy percent of our planet! But did you know that less than one percent of Earth’s water is usable by humans? Most water on Earth is… Read More →

  • ATOS: 6.4
  • Dewey: 363.739'4