Feature

  1. Heligoland Now Bird Refuge

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  2. Back Matter

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  3. “Rooster” Lays Eggs

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  4. Vitamin B in Lactation

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  5. First Glances at New Books

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  6. Excavate Crusader’s Castle

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  7. New Color Test for Toxins

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  8. Man Eats Little of Total

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  9. Light’s Speed Decreasing?

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  10. Front Matter

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  11. Early Man in America

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  12. Cold Increases Immunity

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