More than half a billion years ago, the Grand Canyon was not the arid landscape we know today but a shallow, tropical sea teeming with strange life. Now, scientists have uncovered a remarkable fossil ...

For centuries, travelers have visited popular Grand Canyon monuments like the Osiris Tower and the Temple of Ra. But where do these ancient Egyptian names come from ...

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This piece is part of a special project on deep time examining what the Western U.S. was like thousands, millions and even billions of years ago, and how that history is still visible and ...