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Learn more about our September 30, 2011 cover story on the migration of monarch butterflies
After 34 years in space, NASA's Voyager probes will soon cross the boundary of our solar system into interstellar space
Everglades National Park, at the southern tip of Florida, is the largest wetland in the United States. A wetland is a habitat that is regularly wet or flooded, such as a marsh, swamp...
View a slide show about some of the animals that live in Antarctica
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