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  2. The Challenge of Distance: Estimating the Proximity of Intelligent Life in the Milky Way

    The Challenge of Distance: Estimating the Proximity of Intelligent Life in the Milky Way

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  3. Are Humans the Only Intelligent Life in Our Galaxy? A Cosmic Comedy of Vanity and Vexation

    Are Humans the Only Intelligent Life in Our Galaxy? A Cosmic Comedy of Vanity and Vexation

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