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What spot on Earth have thousands of adventurers tried to reach, but has been seen by only 660 people? In what body of water is it almost impossible to sink -- or swim? Where is the climate so dry that young children have never seen rain? This exciting series gives kids an opportunity to learn about the tallest, the deepest, the hottest, the coldest, and the most dangerous places on Earth. A great introduction to Earth Science, this series looks at some of nature's most famous and amazing record breakers The longest river really starts out as two rivers -- the Blue Nile and the White Nile. They become one river in Sudan. This 30-million-year-old river is one of the few rivers to flow from south to north. The story of the Nile flows from ancient history to modern-day technology.