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  1. Social Sciences Notes

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  2. Resins in the Mines

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  3. New Ideas and Gadgets

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  4. Frozen Heart Valves Replace Plastic Ones

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  5. New Ideas

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  6. Ideas of the Week

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  7. Back Matter

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  8. Three Planets Visible

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  9. Evolving Questions about Galaxies

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  10. Bone Loss and the Three Bears

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  11. Indians Were Peaceable People Made Warlike by Whites

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  12. Back Matter

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