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Americans are loving their coasts to death. Discover how pollution and population pressures are threatening one of the most beautiful—and sought-after—landforms on Earth.
Crowning the U.S. National Parks system, Yellowstone and Grand Teton are a wild expanse of jutting mountains, steaming geysers, and manifold animals that stir the soul.
From white dwarfs to space junk, our solar system is filled with mysterious and often mind-blowing phenomena. How well do you know our cosmic neighborhood?