Feature

  1. Endurance Superstars May Be ‘Born to Run’

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  2. Front Matter

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  3. Male Teenagers at Risk of Steroid Abuse

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  4. Books

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  5. Back Matter

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  6. Chemistry

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  7. Solar Max Spots Sixth Sun-Grazing Comet

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  8. Tretinoin: Lasting Results, Lingering Doubts

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  9. Environment

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  10. High-Tech Tooth Repair

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  11. Chemistry Ties CFCs Firmly to Ozone Hole

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  12. Meeting of Mantle, Core No Longer a Bore

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