Weather has a strong effect(影响) on people. It influences health, intelligence (智力) and feelings. In August, it is very hot and wet in the southern part of the United States. People there easily have heart trouble and other kinds of health problems during this month. In the Northeast and the Middle West, it is hot at some times and very cold at other times. People in those states will have heart trouble after the weather changes in February or March.
      The weather can also influence intelligence. For example, in a 1983 study by scientists, the IQ scores of some college students were very high during storm, but after the storm, their scores were low. Storms can increase intelligence. Very hot weather, on the other hand, can decrease(减少) it. Students in many schools of the United States often do badly in exams in the hot months of the year(July and August).
      Weather also has a strong effect on people's feeling. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel depressed during cold weather. In hot summer weather, on the other hand, fat people may feel unhappy. At about 65F, people become stronger.
      Low air pressure(气压) makes people feel free, but it also increases forgetful- ness. People leave more bags and umbrellas on buses and in stores on low pressure days. There is a“perfect weather”for work and health. People feel best at a tempera- ture of about 64F with 65 percent humidity(湿度).
      Are you feeling sick, sad, tired, forgetful, or very intelligent today? The weather may be the reason.

Making Music with Water

     Have you ever tried making music with glasses or bottles filled with water? I bet your favorite band hasn't. Experiment with your own special sounds by turning glasses of water into instruments, make some cool music and find out how it works.

     What you'll need:

     Five or more drinking glasses or glass bottles.

     Water.

     Wooden stick such as a pencil.

     Instructions:

     Line the glasses up next to each other and fill them with different amounts of water. The first should have just a little water while the last should be almost full, and the ones in between should have slightly more than the first.

     Hit the glass with the least amount of water and watch the sound, then hit the glass with the most water, which makes the higher sound?

     Hit the other glasses and see what noise they make. See if you can get a tune going by hitting the glasses in a certain order.

     What's happening?

     Each of the glasses will have a different tone when you hit with the pencil. The glass with the most water will have the lowest tone while the glass with the least water will have the highest. Small vibrations are made when you hit the glass, and this creates sound waves which travel through the water. More water means slower vibrations and a deeper tone.

    Animals are our friends. We can find different animals here and there. Some animals live in big forests(森林) and some animals live with man.

    Animals can help us a lot. Elephants can do some heavy work for us. And dogs can look after the home. The kids like dogs very much. Cats are women's favorite animals.

    We can eat their meat. We can make coats and shoes with their skins(皮). We can get milk from them. So man can't live without animals.

    Can your body work like batteries? Scientists have found a way to make power. They use nothing but movement of the human body.

    According to a team of scientists from Georgia, America, anything from walking to a standing heartbeat can produce certain energy. Then it will be caught and used by the nanogenerators (纳米发电机). The nanogenerator at a meeting of the American Chemical Society, showed how a small chip (芯片) with millions of small wires could use the human heart to make power. The wires are 500 times thinner than a human's hair. The scientists used a nanogenerator to provide power for a light and a LCD screen.

    Any kind of body movement can be used to produce power, and nanowires can also make electricity when wind blows，car runs and so on. It is not new, but scientists are trying to make it perfect.

    Scientists believe it has a future. "While a few volts (伏特) may not seem like much, it has grown fast, "said the project's lead scientist, Zhong Lin Wang (Z. L. Wang). According to him, if more nanowires and more nanogenerators are put together, they can produce enough energy for powering larger electronics, such as an ipod or a cell phone.