Different weather makes people feel different. It has an effect on health, intelligence（智力）and feelings.

    In August, it is very hot and wet in the southern part of the United Stated. People there have heart trouble and other kinds of health problems during this month. In the Northern and the Middle West, it is very hot at some time and very cold at the other times. People in these states have more heart trouble after the weather changes in February or March.

The weather can also influence intelligence. Fox example, in a 1983 report by scientists, IQ (智商) of a group of students was very high when a very strong wind came, but after the strong wind, their IQ was 10% lower. The wind can help people have more intelligence. Very hot weather, on the other hand, can make it lower. Students in many schools of the United States often get worse in exams in the hot months of the year (July and August).

    Weather also has a strong influence on people's feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have hard time in hot summer.  At about 18℃, people feel more comfortable.

    Are you feelings sad, tired, or unhappy today? It may be the weather's problem.

    What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make a guess, of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the time.

Let us take an example. Man, even five hundred years ago, was shorter than he is today. Now, on the average, men are about three inches taller. Five hundred years is a relatively (相对地) short period of time, so we may suppose that man will continue to grow taller.

    Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain's capacity (容量.) As time goes on, however, we shall have to use our brains more and more and finally we shall need larger ones! This is likely to bring about a physical change too. The head, especially the forehead, will grow larger.

    Nowadays our eyes are being used too much. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man's eyes will grow stronger.                      

    On the other hand, we tend (有…的趋势) to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive (敏感的) because they are used a great deal in modern life.

    What about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both men and women are probably to be hairless!

    Perhaps, all this gives the impression that future man will not be a very attractive (有吸引力的) person to look at! This may well be true. All the same, besides these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and feelings similar to our own.

    Our eyes may be playing tricks on us.  New research shows that sometimes people physically see what they want to see. Cornell University social psychologist(心理学家) David

    Dunning carried out experiments to test whether wishful thinking can actually affect what we see.

    “It's well proved from what is experienced in everyday life, and from the laboratory as well, that people think what they want to think," he says. "We're taking this a step further.

    We're asking if strong wishes and fears can actually affect what people physically see."

    Dunning and his assistants told volunteers that a computer game would show them either a letter or number to decide whether they would drink orange juice or fruit syrup(果子露).

    As they wrote in the Journal of Personality and Social Psychology, the computer would flash an ambiguous picture, which could be seen as the letter "B" or the number "13". Volunteers who were told that a letter would get them orange juice most often reported seeing "B". Those who were told that a number would get them orange juice most often saw "13".

    The researchers also used a hidden camera to track volunteers' eye movements, particularly the first eye movement. "We don't control them," Dunning says, "and they don't even know that we are watching them, so it honestly shows what a person is seeing."

    "This research suggests that the brain is doing a lot of work between the eye and the conscious awareness to affect what we think," Dunning concludes (得出结论). "Before we even see the world, our brain has decided to keep what we want to see and avoid what we don't want to see."

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