Feature

  1. German Scientist Confirms Existence of Neutrons

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  2. Lost in Space: Our Sun’s Twin

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  3. Which Was the First Steamboat? “A Classic of Science”

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  4. Leaders of Invention Tell What the World Needs Most

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  5. Front Matter

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  6. Hand and Foot: Part II: “A Classic of Science”

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  7. Male Sex Hormone Prepared in Pure Form for First Time

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  8. [Photograph]: Voltmeter

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  9. Lonely Magnetic Poles May Change Ideas of Universe

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  10. Blood Examination Urged to Prevent Poisoning

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  11. In Science Fields

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  12. French Scientists Report Two New Sex Hormones

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