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41. Social Science Teaching with the Overhead Projector (11:04)

Date:: 1963
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Summary:: Shows how the overhead projector can be used to add versatility and contribute to effective teaching in the social science classroom.

42. [Mexico, Mexico City, Aztec (Milpa Alta dialect), 1948] (09:17)

Date:: 1948
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43. Hogarth the Satirist (15:39)

Date:: 0000
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Summary:: Presents Hogarth's most remarkable engravings, emphasizing his illustration of the Rake's Progress. (RTF) Film.

44. The Food Crisis (58:45)

Date:: 1966
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Summary:: Contrasts the areas of the world where there is an abundance of food with the areas where starvation is a way of life, and documents the pattern which has led to the lack of an adequate food supply...

45. The Contest For North America (30:12)

Date:: 0000
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Summary:: Traces the eighteenth century struggle for control of North America. Discusses the English-French rivalry and the French defeat. Considers England's pause to consolidate her position before attacki...

46. Diversity in Time I (Rates of Change) (30:35)

Date:: 1962
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47. New Approaches in Smoking Cessation (1:29:00)

Date:: 1997
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Summary:: Discusses effective counseling and pharmacotherapy of smoking cessation. Includes special presentation from former U.S. Surgeon General, C. Everett Koop, MD.

48. Doctors in space. Collision stations (29:06)

Alternative title:: Collision stations
Date:: 1958
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Summary:: Discusses the problem of meteorite damage during space travel. Demonstrates the Navy's full-pressure space suit for emergency exit. Explains the difficulties of escape and survival in space. Featur...

49. Radio waves (27:09)

Date:: 1960
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Summary:: Describes the nature and use of artificial radio waves generated by man; examines the ionosphere, and explains its critical role in passing, reflecting, and absorbing radio waves; discusses natural...

50. The Speed of Sound (14:38)

Date:: 1956
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Summary:: Explains that a major problem of jet propulsion is increasing the speed of the expanding gas in the jet engine. Shows how the speed is increased by the addition of heat, more gas,and heavier molecu...