Tập
NOVA: Episode 16
Tóm tắt
In a world that each year loses up to 40 percent of its crops to insects, some form of pest control is desperately needed. But chemical pesticides have backfired. Pesticide-resistant insects frequently develop, and previously harmless insects have become devastating infestations. Farmers have found themselves trapped on a "pesticide treadmill"—the more they spray, the more they have to spray. NOVA examines several alternatives for pest control.
Chi tiết
- Phim bộ
- NOVA
- Mùa
- Mùa 5
- Tập
- Tập 16
- Ngày phát sóng
- 1978-05-24
- Thời lượng
- 55 min
Thông tin tập
Episode 16 là tập 16 trong Season 5 của NOVA. Tập này phát sóng ngày 1978-05-24. Thời lượng là 55 min.
Tập trước / tập sau
Tập 15
When first invented 18 years ago, lasers were called "a solution looking for a problem;" nobody could think what to do with them. But in fact research scientists immediately began to exploit their pure colors and near-perfect focusing ability. Today lasers have grown into a billion-dollar business. They are used in construction, manufacturing, clothing, dentistry and medicine. And the future uses of lasers are likely to be of major significance as the means of achieving nuclear fusion and as a very high efficiency communications medium.
Tập 17
For thousands of years people have managed to live in deserts all over the world. But in recent years, a growing population and the demands of the international market have put more stress on these poor and easily exhausted lands. NOVA examines the consequences and possible solutions to desertification.
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Tập 18
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Tập 13
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Tập 19
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Tập 12
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Tập 20
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Tập 11
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Tập 21
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Tập 10
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Tập 9
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