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Lesson 25-2 Non-auditory effects of noise On turning eagerly to the text, one learns th...

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Lesson 25-1 Non-auditory effects of noise Many people in industry and the Services, who...

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Lesson 24-2 Beauty There is no sky in June so blue that it does not point forward to a ...

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Lesson 24-1 Beauty A young man sees a sunset and, unable to understand or to express th...

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Lesson 23-2 Bird flight Duck, and like them the pigeons, are endowed with steel-like mu...

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Lesson 23-1 Bird flight No two sorts of birds practise quite the same sort of flight; t...

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Lesson22-2 Knowledge and progress 知识和进步 Then knowledge began to be accumulated accordin...

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Lesson22-1 Knowledge and progress 知识和进步 Why does the idea of progress loom so large in ...

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Lesson 21-2 William S. Hart and the early 'Western' film And although no period or plac...

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Lesson 21-1 William S. Hart and the early 'Western' film William S. hart was, perhaps, ...

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Lesson 20-3 Snake poison Vipers (adders)and rattlesnakes manufacture the blood poison, ...

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Lesson 20-2 Snake poison In fact, it would be an assistance to all carnivores though it...

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Lesson 20-1 Snake poison How it came about that snakes manufactured poison is a mystery...

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Lesson 19-3 The stuff of dreams He showed that the average individual's sleep cycle is ...

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Lesson 19-2 The stuff of dreams If it is not a question of resting the body, then perha...

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Lesson 19-1 The stuff of dreams It is fairly clear that sleeping period must have some ...

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Lesson 18-3 Porpoises This is not easy, and may require two porpoises working together....

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Lesson 18-2 Porpoises Porpoises and sharks are natural enemies. It is possible that upo...

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Lesson 18-1 Porpoises There has long been a superstition among mariners that porpoises ...

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Lesson 17-2 A man-made disease It effectively spread the disease all over the continent...