With the development of technology, WiFi is becoming more and more popular and important in people’s daily life.But have you ever experienced it? Just imagine what life will be like if there is no Internet.Maybe you won’t be able to talk with friends, play video games or search for information for your homework on the Internet.But in fact,only one third of the world’s population are able to get information on the Internet.The rest are too poor to buy WiFi access(使用    权) or they live in remote areas.As a result, they live without the Internet.

  Google and Facebook, two world-famous technology companies, have decided to do something about it.Google’s Project Loon will try to send balloons which are 15 meters wide into our Earth’s stratosphere(平流层) in 2015.The balloons are made of a special material that is three times thicker than the plastic bag we use every day.Each balloon will carry a minicomputer and a WiFi radio.The WiFi radio will send the Internet over the areas it is floating over.Then people can get up-to-date information on weather or news.

There are only two seasons in some countries-the dry season and the rainy season．They are India,Vietnam and some countries in Africa．It is never cold there and it doesn’t snow．In the dry season it is as warm as it in the rainy season．When it is the dry season.it doesn’t rain at all．It is very.very hot．All grass and leaves on the trees are yellow．Animals and people are very thirsty．It is a very difficult time for them! When it is the rainy season.the rain doesn’t stop,it rains day and night．There is a lot of water around! Some animals like it．but some don't． There is a place where there are no season at all．It is the Antarctic．It is very cold all the year round．There are no countries and no cities there．There are some villages in the Antarctic．Who lives there? The people from all countries come there to learn about the coldest place,its animals and birds．But there are no trees.no flowers.no fruit there．so people can’t live there long．

When you’re not at home, many worries may start to crowd your mind. Did I switch the coffee maker off? Did I lock the door? Are the kids doing their homework or watching television? With a smart home, you can quiet all of these worries．

Scientists are trying to make robots to do many things -- play music, work in hospitals. But can they run a restaurant? There are two robot receptionists (接待员) and six robot waitresses and waiters in the Dalu Robot Restaurant in Jinan, Shandong. One hundred customers (顾客) can be in the restaurant at a time. Two of the robots serve drinks. The other four serve the food. The robots only do some of the work in the restaurant. There are also people working there, especially (尤其) in the kitchen. The cooks are humans because the robots don't have the skills (技能) to cook.

On the night of the Mid-Autumn Festival in 2016, Tiangong-2, China’s second space lab (空间实验室) flew to the sky. It flies around the Earth and will run for at least two years.

On October 17th, the Shenzhou 11 manned spacecraft (载人飞船) sent two astronauts to the lab. They worked in the lab for thirty days. They did important experiments(实验) in physics and medicine.

On November 20th, the two astronauts appeared in the TV show Challenge(挑战) the impossible. They gave us a wonderful show from the space lab Tiangong-2.They successfully challenged what seemed impossible in space. Before the game, Chen Dong and Jing Haipeng, an astronaut on his third space trip, showed the bat they were given to play pingpong in space. Then the astronaut Chen Dong sent a ball on one side, ran after it to the other side to catch up with it, then beat it back. He did like this many times. According to an expert, playing pingpong in space is really impossible. In space, when the ball is hit, it goes only straight forward and cannot spin(旋转) in the air. But Chen Dong made it. After that, they showed us some young plants of lettuce (a kind of vegetable)and rice that they grow in space. This is the first time the Chinese plant vegetables in space. At last, Chen Dong stood on his head to drink some pu-erh tea. He finished this special challenge successfully.

After the space lab task comes to an end, China will start building our own space station. The plan is to have the first space station working around 2022.

          How far could scientists let their curiosity go? You’d find out by looking into the Ig Nobel Prize.The awards are given annually to the 10 strangest research projects of the year. It is to “honor achievements that first make people laugh, and then make them think”.

 Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all, you probably sing when you are happy. Generally it is thought that birds do sing some of the time just because they are happy. However, they sing most of the time for a very different reason. Their singing is actually a warning to other birds to stay out of the area that an animal regards as its own. Only he and his family welcome there. No other families of the same kind are welcome. Your yard and house are your area where only your family and friends are welcome. If a stranger should enter your area and make you frightened, you might shout. Probably this would be enough to frighten him away. If so, you have actually drive the stranger away without having to fight him. A bird does the same thing. But he expects an outsider away almost any time, especially at nesting (筑巢) season. So he’s screaming (高声尖叫) all the time, whether he can see an outsider or not. This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away．

   Birds sing loudest in the spring when they are trying to draw a mate’s attention and warn others not to enter the area of theirs．You can see that birds have a language of their own．Most of it has something to do with drawing mates’ attention and setting up areas．

Unlike your heart or brain, your teeth weren't ready to work from the day you were born. Although babies have the beginnings of their first teeth even before they are born, teeth can’t be seen until babies are about 6 to 12 months old.

After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primary or baby teeth, and there are 20 in all. When a child gets to age 5 or 6, these teeth start falling out, one by one.

A primary tooth falls out because it is being pushed out of the way by the permanent tooth(恒齿) that is behind it. Slowly, the permanent teeth grow in and take the place of the primary teeth. By about age 12 or 13, most kids have lost all of their baby teeth and have a full set of permanent teeth.

There are 28 permanent teeth in all — eight more than the original set of baby teeth. Between the ages of 17 and 21, four more teeth called wisdom teeth usually grow in at the back of the mouth. They complete the adult set of 32 teeth.

To wash yourself, you take a shower. Animals need to keep clean, too. How do animals clean themselves?

     Cats lick (舔) themselves to keep their fur clean. Did you watch a pet cat clean itself? Elephants take showers much as you do, they walk into a river or lake. Pigs also like to roll around in water. This keeps them clean and cool. If there is no clean water, they will roll in mud (泥) on a hot day. They do this to cool off. Pigs do not really like mud. They are happier in a nice,clean pond (水池). Bats have a funny way to keep clean. They lick their thumbs to clean their ears!

     Guess how polar bears clean themselves. They use snow, of course!

     Some animals take showers in dust not in the water! The wombat (毛鼻袋熊) is an Australian animal with lots of fur. To get clean, it lies down. Then it covers itself with sand! Birds clean themselves in many ways. Sometimes they wash in water. That's why some people put birdbaths in their yard. At other times birds take dust showers, just like wombats.

 We have known for a long time that flowers of different plants open and close at different time of day. Yet no one really understands why flowers open and close like this at particular times. It is not as simple as we might think, as new experiments have shown. In one experiment, flowers were kept in darkness. We might expect that the flowers, without any information about the time of the day, did not open as they usually do. In fact, they continued to open at their usual time. This shows that they have some mysterious (神秘的) way of knowing the time.

    Their sense of time does not depend on information from the outside world; it is, so to speak, inside them, a kind of “inner clock”. This discovery may not seem to be very important. However, it was later found that not just plants but also animals including man have this “inner clock” which controls working of their bodies and their activities.

Human beings, then, are also controlled by this mysterious power. Whether we wish it or not, it affects such things in our life as our need for sleep, our need for food. And our ability to concentrate(集中).