41. What's In a Child's Mind?

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42. Herman J. Muller Dies at 76; Discovered Perils of Radiation

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43. Nature Versus Nurture

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44. A Test Tube Daddy

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45. Informed Guinea Pigs

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46. The Vital Thyroid Hormone

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47. Each of Us Is a Society

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48. First an Egg, Then a Man

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49. Fusion of Fish and Man

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50. Tumor Spread by Fusion

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