Tourists at Persepolis marvel at the grandeur of a bygone age amid worries about the future. Steve Inskeep/NPR hide caption

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At Persepolis, Iran's Grand Past Overshadows Its Frustrating Present
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Ava Gene's, a Roman-inspired restaurant in Portland, Ore., incorporates colatura, a modern descendant of ancient Roman fish sauce, into several of its dishes. Deena Prichep/NPR hide caption

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Fish Sauce: An Ancient Roman Condiment Rises Again
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The moon is one of the most obvious natural indicators that the passing of time follows a pattern and can be tracked in a useful way. Bill McKelvie/iStockphoto.com hide caption

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