Feature

  1. Tattoo Marks Yield to Chemical Treatment

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  2. Light’s Speed Decreasing?

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  3. Father of G. E. Research

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  4. “Forcible Feeding” of Wheat

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  5. Early Man in America

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  6. Excavate Crusader’s Castle

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  7. New Color Test for Toxins

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  8. Vitamin B in Lactation

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  9. Tooth-Brush Peril

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  10. Classics of Science: Induction of Electric Currents

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  11. Mercury Has 2112-Hour Day

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  12. Heligoland Now Bird Refuge

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