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What Moves Death Valley's Roving Rocks?
New Study Suggests Stones "Float" Across Lakebed on Ice
Photo of the Day
Nichols Bridgeway, Chicago
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On TV This Week
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"Whale That Ate Jaws" Saturday 9PM
See the unforgettable footage of a killer whale turning a great white into prey.
Editors' Picks
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Coming This Fall
An all-new seven-part television event will take you on the arduous journeys millions of animals undertake to ensure the survival of their species. Join us for "Great Migrations."
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Seeing Double?
We sent a photographer to the annual Twins Days Festival in Twinsburg, Ohio. Take a look at photos of the participants and then test your memory with a challenging match game.
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Watch: Visiting Spain
Experience Spain's contagious passion for living after visiting cities filled with delicious sangria, gorgeous beaches, and rich history.
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International Street Food
Got a craving for something unusual? Take a peek at our gallery of street food and find the world's most puzzling and scrumptious snacks.
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In the Field
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Help Make a Discovery
Search satellite images for clues that could identify unknown archaeological sites across Mongolia.
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Events
Attend exhibitions and live events at our headquarters in Washington, D.C., and in cities across the United States and Canada.
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Discover the Treasure
See "Afghanistan: Hidden Treasures From the National Museum, Kabul" in Germany through October 12.
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Shrink Your Water Footprint
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Water Calculator
Figure out your footprint, then join hundreds of website visitors who together have pledged to save thousands of gallons a day.
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Blue Planet Expedition
Once you pledge, sign up to get more involved in Alexandra Cousteau's cross-country water expedition.
From Our Blogs
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Big Sharks Caught Near D.C.
Not far from the U.S. capital, two eight-foot (2.4-meter) sharks have been caught in the past week.
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BPA, Testosterone Linked
BPA is in CDs, water bottles, eyeglasses and now it's in your urine, too. And it may be messing with your hormones, according to new research.
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LHC Black Hole Suit Dropped
Court decision states "the alleged injury, destruction of the earth, is in no way attributable to the U.S. government's failure to draft an environmental impact statement."
