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The Grand Canyon's Oldest Rocks
“This rock is more than 4000 feet below the rim of the canyon, and it’s one of the oldest rocks of them all. “ By measuring the radioactive elements in this Granodiorite—the rock here at the bottom—geologists have figured out it formed 1.7 billion years ago.
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Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.
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Discover how two revolutionary ancient inventions changed the course of humanity forever.