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Arizona Rock Art
Unravel the mysteries of Arizona's petroglyphs, carved into the stone 5,000 years ago by the Sinagua of the Verde Valley.
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We received over 12,000 entries, and over 28,000 votes were cast. Find out who takes home the Grand Prize!
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Eighteen percent of the world's population can't get safe drinking water. Test your water knowledge.
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Travel with some of the most prominent specialists in the world.
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Check the daily schedule for your favorite shows.
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