Bats are the only “flying animals” in the world. They can't see very well. We often hear “as blind as a bat”. Yet they have no trouble flying on the darkest nights and finding their ways round. How can bats fly and see at night? They fly by radar(雷达).

The bat's radar system(系统) works the same way as the radar in ships and planes. As a bat flies through the air, it makes a sound. If the sound hits things, it will come back and the bat's ears will receive the message. In this way the bat is able to know where the things are. Bats go out for food at night. In the daytime they hang in some dark places. Some people think bats are bad animals. In fact they are useful animals.

    What is a museum? A museum is a good place to keep old and beautiful things. A museum may be a place to learn about science and a place to find out about art or people or animals.

    What is inside a museum? Some museums have old cars and airplanes. Many museums have pictures and statues(雕塑). Others have rocks and old bones (骨头). One museum even has a real old street inside. It has shops and people's statues doing business. It looks so real that one might feel that he was back to the old time.

    Many cities have museums. Some very small towns have museums, too. Indianapolis has a children's museum. Children do not have to pay (付款) to get in. Children often go to the museum. They like to look at the dinosaur (恐龙)bones. They see a white bear ten feet tall.

    On Saturdays, Indianapolis children can hear talks about animals and trees. They see movies. They take hikes. They even learn to make things there.

    We each have memory(记忆力).That's why we can still remember things after a long time. Some people have very good memories and they can easily learn many things by heart, but some people can only remember things when they say or do them again and again. Many of the great men of the world have got surprising memories.

    A good memory is a good help in learning a language. Everybody learns his mother language when he is a small child. He hears the sounds, remember them and then he learns to speak. Some children are living with their parents in foreign countries. They can learn two languages as easily as one because they hear, remember and speak two languages every day. In school it is not easy to learn a foreign language because the students have so little time for it, and they are busy with other subjects, too. But your memory will become better and better when you do more and more exercise.

    When you're closing your eyes and hitting your pillow, you're probably not giving much thought about the sleeping position throughout the night. Most people don't change their sleeping positions throughout their lives. The following is why you might want to pay more attention: Your sleeping position can actually say a bit about who you are and what your personality is like.

    There are many sleeping positions. The fetal (胎儿的) sleeping position is generally the most common sleeping position. Fetal sleepers sleep on their side, they move into a position in which their body makes a rounded shape. People who sleep in the fetal position are often quite sensitive and generally shy. They are often worried or nervous and don't focus their attention on the main problem, but get into trouble on very small pieces of information.

    The log (木头) sleeper rests on the side with a straight body when hands and legs are kept at the sides. These sleepers are often relaxed, but also can easily believe lie-tellers. If you're a log sleeper, you might want to keep in mind that it's good to be easy-going and have less stress, but don't be so quick to go with the flow (流) at all times.

    The third one is the soldier position. Soldier sleepers typically lie on their backs with both arms close to their sides. In general, they are the strong and silent type. However, they can also put the pressure on. "They can be quite strict with themselves as well as others," a scientist added.

Popsicles

Popsicles were invented by 11-year-old Frank Epperson in 1905. He forgot a drink of juice and left it with a stir（搅拌） stick in it outside on a cold night. The next day it was ice. Because of this he couldn't drink it any more, but he could eat it. It tasted good! These ice sticks became popular among kids at school in summer because they were delicious and helped them stay cool.

More than a hundred years later, popsicles are sill one of the best summer treats!

Crayon Holdans

When 11-year-old Cssidss Coldstein needed crayons for a school project, she had a hard time because, there were so many small or broken ones. She found some small clear plastic tubes（管子）at home. Although the tiny tube were usually filled with water to keep flowers fresh, she found that they fit tightly （紧紧地） around the crayons. She was now able to hold them easily. This is how she invented Caryon Holders.

Wristies

When snow gets in kids' gloves and their hands get wet, they feel uncomfortable. 10﹣year﹣old Kathryn Gregoary decided to do something about it. She created the wristies as she wanted to keep her wrists（手腕）warm and dry. Wristies are long gloves with no fingers and they are worn under your coat. They help you when you work in the cold because your hands stay warm while you use your fingers. With her parents' help, Kathryn also opened a small shop where she sold her wristie. And she still runs it today.

All these inventions have one thing in common—the kids were trying to solve problems in their lives. When you meet problems, what would you do？ If the kids can do it , you can do it, too!