31. Chromosomes and Crime

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32. Our Pal, The Computer

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33. Puzzling Over the Dawn of Life

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34. Our Neighbor Mars

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35. Can We Keep Mars Clean?

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36. Are There Bugs on Mars?

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37. More Vaccines on the Horizon

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38. Flaws in Disease Data

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39. Cheap Vaccine Can Be Costly

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40. The Priority of Education

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