Color is everywhere in lives. But what does color mean? Why are people more relaxed in green rooms? Why do people do their best in blue gyms? That's the magic of color!

    Scientists from the US did an experiment. They asked two people to go into two different rooms. One went into a room painted in pink, and the other went into a blue room. They had to stay in the rooms for one hour. But they had to guess the time, because they didn't have a watch or any other thing to see the time. In the end, the person in the pink room came out in about 40 to 50 minutes. The person in the blue room came out after 70 to 80 minutes.

    The results show that color can change people's feelings about time. Warm colors make people feel that time is going faster than cool colors.

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    Imagine the situation. You are driving along a desert or on a mountain. You have no idea where you are. You passed the last house two hours ago. Then your car breaks down. It is night and it is cold. You have no mobile phone. What do you do? Well, next time take a GPS with you. This invention may be able to help you. It is a device(装置) which uses satellites (卫星) to find the user's position(位置). It can find your position to within 20 metres. A GPS cannot start your car, but at least you will know where you are.

    GPS, which means Global Positioning System, is a small radio receiver. It looks like a mobile phone. You can hold it in your hand, or put in your pocket. It is sometimes put into a watch or a telephone. We also find GPS devices in cars, planes, or boats. Some of these devices have electronic maps, so you know where you are. For example, in a city they can tell you the name of the street.

    There are three parts to the Global Positioning System. The first part is the receiver. You can hold it in your hand, or have it fixed into your car, plane, etc. The second part is a group of satellites orbiting the Earth. The receiver contacts at least four of the satellites and calculates(计算) its position. The third part of the system is a network of ground stations. They are all over the world. They control the satellites and make sure they are working well.

    Some people think that in the future the GPS will be as common as the mobile. They are becoming cheaper and more and more accurate(精确的). There are also new uses for the GPS. Perhaps they will become like watches. Everyone will have one and you will never be lost again.

    These days, many students like playing 3D games. Do you know what 3D games are like? In most 3D games, game players need to control (控制) a character. The character can be a robot or a soldier (士兵). Game players usually use the mouse to make the character move around in his own world. Game players can find things such as food and weapons (武器) to help them go on with the game. The character can go straight, sit down, turn left, turn right or pick up things in the game.

    Some 3D games have many levels (等级). The character needs to finish different goals for each level. Game players can play against their computers, and sometimes they can play with other players on-line. It's great fun to play 3D games. But playing 3D games for long is not good for our study.

    Do you know how to make friends with a group of people? Let me tell you the steps about making friends with the group. Maybe it's helpful(有帮助的)to you.

    First, you need to know what kind of group they are. If people of the group are shy, never ask them “Why don't you talk?” “Why are you quiet?” or “Why do you look shy?”.They don't like such questions.

    Next, remember that each group is different. They may use different words, like different things or have different ways of “hanging out”.

    Then, the important thing is that you should try to be outgoing. If you are outgoing, you would become very popular. Remember, nobody wants to make friends with a shy person.

    Finally, find a right topic to talk with the group. For example, you can talk with them about the weather, the news, their hobbies or their school life.

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    The earth moves round the sun , and the moon moves round the earth . When our part of the earth faces the moon , it is night .

    The sun is much bigger than the moon . But sometimes the moon looks bigger than the sun , because it's much nearer to the earth

    The sun is very bright . It gives off very strong light . The moon looks quite bright , too. But it doesn't give off any light at all .

    The moon looks much bigger and brighter than the stars . But actually the stars are much bigger and brighter than the moon . They look smaller than the moon because they're much farther away from us .

The seasons on Earth

    The Earth that we live on is moving all the time. The Earth turns around itself once every 24 hours. This gives us day and night. The Earth also travels around the Sun once every year. This gives us the four seasons. We have spring and summer when our part of the Earth leans (倾斜) towards the Sun. We have autumn and winter when our part of the Earth leans away from the Sun.

    In many places on Earth, there are four seasons in a year. But in some places there are only two seasons. For example, near the North Pole (北极) there are only winter and summer. The winter nights are long. For more than two months you can't see the Sun, even at noon. The summer days are long. For more than two months the Sun never sets, and there is no night. In the tropics (热带地区) there are also two seasons: a rainy season (wet season) and a dry season.