技术文库

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  What makes trading between rich countries difficult?

  Chickens slaughtered in the United States, claim officials in Brussels, are not fit to grace European tables. No, say the American: our fowl are fine, we simply clean them in a different way. These days, it is differences in national regulations, far more than tariffs, that put sand in the whee ...

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  In what way does echo-location in bats play an utilitarian role?

  Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role. To get a full appreciation of what this means we must turn first to some recent human inventions ...

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  How does the older investor differ in his approach to investment from the younger investor?

  There is no shortage of tipsters around offering ‘get-rich-quick’ opportunities. But if you are a serious private investor, leave the Las Vegas mentality to those with money to fritter. The serious investor needs a proper ‘portfolio’ — a well-planned selection of i ...

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  What is one of the features of modern camping where nationality is concerned?

  Economy is one powerful motive for camping, since after the initial outlay upon equipment, or through hiring it, the total expense can be far less than the cost of hotels. But, contrary to a popular assumption, it is far from being the only one, or even the greatest. The man who manoeuvres careless ...

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  Who, according to the author, are ‘Fortune’s favoured children’?

  a gifted American psychologist has said, ‘Worry is a spasm of the emotion; the mind catches hold of something and will not let it go.’ It is useless to argue with the mind in this condition. The stronger the will, the more futile the task. One can only gently insinuate something els ...

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  What is the most influential factor in any human society?

  In man’s early days. competition with other creatures must have been critical. But this phase of our development is now finished. Indeed, we lack practice and experience nowadays in dealing with primitive conditions. I am sure that, without modern weapons, I would make a very poor show of ...

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  What influences us from the moment of birth?

  Custom has not commonly been regarded as a subject of great moment. The inner workings of our won brains we feel to be uniquely worthy of investigation, but custom, we have a way of thinking, is behaviour at its most commonplace. As a matter of fact, it is the other way around. Traditional cust ...

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  What does the ‘uniquely rational way’ for us to communicate with other intelligent beings in space depend on?

  We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start. Of all the planets in our solar system, we ware now pretty certain the Earth is the only one on which life can survive. Mars is too ...

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  What does a pen have to do to record on paper the vibrations generated by an earthquake?

  An earthquake comes like a thief in the night, without warning. It was necessary, therefore, to invent instruments that neither slumbered nor slept. Some devices were quite simple. One, for instance, consisted of rods of various lengths and thicknesses with would stand up end like ninepins. Whe ...

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  At what point does the training of a captive wild elephant begin?

  Two main techniques have been used for training elephants, which we may respectively the tough and the gentle. The former method simply consists of setting an elephant to work and beating him until he does what is expected of him. Apart from moral considerations this is a stupid method of train ...

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  What false impression does an ocean were convey to the observer?

  Waves are the children of the struggle between ocean and atmosphere, the ongoing signatures of infinity. Rays from the sun excite and energize the atmosphere of the earth, awakening it to flow, to movement, to rhythm, to life. The wind then speaks the message of the sun to the sea and the sea t ...

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  How did Vera discover she had this gift of second sight?

  Several cases have been reported in Russia recently of people who can detect colours with their fingers, and even see through solid and walls. One case concerns and eleven-year-old schoolgirl, Vera Petrova, who has normal vision but who can also perceive things with different parts of her skin, ...

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