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We are excited to announce the release of the EarthViewer app for iPad®. Click here for download instructions, screenshots, and related resources. What caused dinosaurs to disappear from the planet? How do species evolve? What about human beings—are we still evolving? Delve into these questions through unforgettable stories featuring leading scientists and stunning field locations—from the postglacial lakes of southern Alaska to the highlands of East Africa to the badlands of North Dakota.