Feature

  1. Quantum Leap

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  2. Front Matter

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  3. X-Ray ‘Ridge’ in Galactic Center

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  4. Behavior

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  5. Biomedicine

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  6. Biology

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  7. Textbook Selection: Survival of the Fittest

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  8. Mexican Quake Update

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  9. Comets Halley, G-Z Seen in Same Photo

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  10. Late Maya Culture Gets Renovations

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  11. Back Matter

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  12. Mouth Immunity

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