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Imagine the blooming of the very first flower. Or a 3-ton sloth with massive claws standing as tall as a giraffe. And horses the size of small dogs that have to

This text asserts that a stroke should be thought of as a syndrome, or collection of disease processes, rather than a single disease. Strokes are characterized

This series tells the incredible story of our planet, the formation of our continent, and the events and transformations that have brought the diversity of life

The DK Eyewitness Costa Rica Travel Guide is your indispensable guide to this beautiful part of the world. The fully updated guide includes unique cutaways, flo

Imagine vast, flowing, 10,000-foot-thick ice sheets covering much of the land. See huge, elephant-like wooly mammoths roaming the tundra. Picture hunting monstr