Do you like drinking coke, coffee, juice or milk? Do you often drink them instead of water? However, of all the things we eat and drink, water is the most important. Not all of us understand this but it is quite true. Human body can go without food for a long time, but two or three days without water usually makes people die.

    Many people do not understand how much water the human body needs to work well. What is true is that many people do not drink enough, especially in hot weather. Most people drink only when they are thirsty but often need more water after they take exercise.

    Does anyone know what is the 65%-75% of human body? It is water. If we do not have enough water, we will feel tired and become ill. So, do you know what the best drink is? It's water.

    Millions of children in the United States go to summer camps. Some go to play outdoors at traditional camps in the woods, in the mountains or on lakes. But families now have many choices of special camps. These can be in the middle of nature or a big city. Special camps offer young people the chance to learn about different subjects: Anything from space exploration to business to medicine.

    In technology camps, one subject that children can learn about is video game design. They learn how to use computer programmes to create games of their own. One programme that teaches video game design is called Cybercamps. Children can learn how to design their own virtual(实际上的) worlds to set their video game in. Then, they programme their own rules and objects into the game.

    Cybercamps also offers courses in robot building and Web design. A recent story in the Washington Post described how one child made a robot that could sing a song. Another made a robot that could follow a black line drawn on a piece of cardboard. Also, children can learn how to make Web sites. One child made a site for pokeman, one of his favourite cartoon shows.

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    Sixty years ago，human beings first reached the top of Mount Qomolangma， known as Mount Everest in the West. But the increase in climbers is turning the world's highest mountain into the “world's highest junkyard(垃圾场)”.

    Every year， more than 700 climbers spend nearly two months on Mount Qomolangma. They have left human waste and all kinds of rubbish， including oxygen bottles， broken tents， and plastic bags， according to Ang Tshering Sherpa， chief of the Nepal Mountaineering Association.

    “The waste has become a health danger to people in the area since they depend on water from rivers fed by the melting glaciers(融化的冰川)，” Sherpa said.

    More and more people have realized the danger that Mount Qomolangma is facing and they are now taking active actions. To deal with the problem， Nepal has supported a special team of explorers and volunteers to clean the mountain since 2008. So far they have brought down 15，000kg of rubbish. Nepal also started to ask each climber to bring down 8 kg of rubbish in 2014.

    On the Chinese side of the mountain， Tibet(西藏) will collect a cleaning fee of $100-200 (620-1240 yuan) per climber starting from this year. A program named “Mount Qomolangma Action at the Third Pole of the Earth” also started in 2004 to clear up the mountain.

    Hopefully， human beings will finally solve the problem， just as they found the way up the mountain successfully.

    Fraser Island is in Queensland, Australia, about 200 kilometers north of Brisbane. It is about 120 kilometers long and 240 kilometers wide. It is a very important island because it is completely made of sand. In fact, it is the largest sand island in the world. There is no airport on the island, but there is a long beach along the east coast. Planes arrive and leave from here.

    The sand makes unusual shapes. There are hills made of sand called sand blows. Nothing grows on them. They move one or two meters a year from the northwest towards the southeast of the island, getting bigger and bigger. At other places on the island, such as Rainbow Gorge, The Cathedrals and Red Canyon, the sandy rocks have different colors. Sometimes the rocks are so brown that they turn the sea brown, like coffee.

    Surprisingly, the sandy island has a lot of different plants and animals. There are dark forests—eucalyptus woods, beautiful flowers and over a hundred lakes. There are many kinds of birds, like owls and curlews. There are many animals there, too, such as crocodiles, flying foxes and wild dogs called dingoes.

    About 500,000 people visit the island every year to see the island's beauty and nature. People enjoy camping and hiking（徒步）there. Unluckily, the visitors create problems. They damage plants and frighten animals. Their sun cream（防晒霜）makes the water dirty. So it is necessary to manage the visitors. For example, people may not use motor boats or go fishing in the lakes, and they need official papers to drive there.

    What will life in the future be like? Will it be much better than it is now? And what will we be able to do in 10, 20 or 30 years' time?

    Genetic engineering (基因工程)may help us make the perfect human. Babies may grow up to play basketball like Yao Ming or look like Cecilia Cheung. Also, we may be able to bring the dead back to life. Maybe people will be able to meet and talk with their dead family members.

    Over the next 20 to 50 years, it will become harder to tell the difference between humans and machines. Perhaps we will be able to make copies of ourselves, so we will appear to be alive long after we are dead. People may be able to find ways of putting the life of a person into a new body.

    Nanobots(纳米机器人)will be important. We will use them when we are sick. For example, when we have a stomachache, we will swallow (吞下) a nanobot and it will travel through our stomach, taking a video of what's happening there. The video will help the doctor cure us.

    In the future, computers may have their feelings. They may be able to think better than us. We may be more and more interested in computers and the internet, spending all our time in front of computers. Perhaps we will forget our real needs. Perhaps we will become super couch potatoes weighing 250 kg!