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Mount Vinson: Antarctica's Highest MountainMount Vinson is the eighth-highest mountain in the world.
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Mount Elbrus: Facts About Europe's Highest MountainMount Elbrus is in the Caucasus Range, the mountains that separate Europe and Asia.
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Olduvai Gorge: Oldest Evidence of Mankind's EvolutionOlduvai Gorge is a rich archaeological site in Tanzania where evidence of the first humans has been found.
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Leonardo da Vinci: Facts & BiographyLeonardo da Vinci, perhaps most noted as an artist, was also an architect, inventor and chronicler of science, among other outlets for his talents.
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King Richard III: Facts & BiographyKing Richard III has been portrayed in fiction as a tyrant, but the facts are not quite as bloody.
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Andes: World's Longest Mountain RangeThe Andes Mountains stretch about 4,500 miles along the western coast of South America.
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What is a Jet Stream?These high-speed rivers of air affect climate and weather.
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What Are the Seven Seas?"To sail the Seven Seas" has meant different things to different cultures throughout history.
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Grand Canyon: Location, Formation & FactsThe Grand Canyon is a rich, geologic landscape formed over millions of years by a combination of natural forces.
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Sundogs: Spots of Color Beside the SunUnder certain conditions, ice crystals act as prisms that create patches of light accompanying the sun.
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What is the Gulf Stream?This powerful ocean current helps warm Western Europe, and it was instrumental in the colonization of the Americas.
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Tornado Alley: Where Twisters FormTwisters frequently form in a wide swath of the Midwest called Tornado Alley.
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Kilimanjaro: Facts About Africa's Highest PeakMount Kilimanjaro rises from the plains of Tanzania.
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Great Barrier Reef: Facts, Location & AnimalsAustralia's sprawling coral reef is the largest natural structure on Earth.
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What Is Democracy? Definition, Types & HistoryThe basic definition of democracy: rule by the people. But democracies can be defined as parliamentary, Jacksonian, liberal, social and other types.
