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  1. Why Do Women Menstruate?

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  2. Science News Books

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  3. Front Matter

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  5. Understanding IUs

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  6. Correction: Earth Science

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  7. Catastrophic $text{CO}_{2}$

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  8. Cheap Pills

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  9. Warmth after Surgery Can Save Lives

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  10. Viruses May Leave a Weighty Legacy

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  11. Astronomers Find New Member of Local Group

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  12. Solar Cells May Sub for Retinal Receptors

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