Have you ever seen a car without a driver? It sounds crazy, but these computer-driven driverless cars will soon be filling roads near you. Companies like Google and Tesla have been designing and testing these cars, and the technology is there.

    So how? The cars have sensors（感应器）all around which can find other cars and objects in the road. Road signs are read by cameras, and satellite navigation systems（卫星导航系统）are used so the car knows how to get where you want to go. All you have to do is type in the address! Finally, a central computer system takes in all the information that it receives from the sensors and cameras and works out when to speed up, stop and turn.

    Sound like your idea of heaven（天堂）? Sitting back, looking out of the windows and even watching a film or reading a book while ‘driving' would be possible with this new technology. You wouldn't have to worry about remembering directions to where you're going. In addition, computers would also drive more safely than people — they would obey the rules and have quicker action times when in dangerous situations.

However, there are many drawbacks of driverless cars. Computers would have difficulties making ethical（道德的）decisions: if a child ran into the road, would the computer choose to hit the child or turn suddenly and potentially kill the car's passengers? Moreover, I personally find driving fun –I'd miss never driving a car myself. There would also be many other decisions to be made –should children, or drunk people, be allowed in a driverless car by themselves? Or would there need to be a person with a driving license in the car at all times?

    I'm not certain I'd want a driverless car – but it's only a matter of time before they'll become more affordable and popular on our roads.

    Winter is very cold in many countries. It's easy for you and me to keep warm. If we are cold, we can just buy a warm coat or use a heater and we will feel better. But what about animals? How do they keep warm in winter?

    Some animals migrate(迁移). This means they travel to places where the weather is warmer. Many birds leave before the winter starts. They fly in groups. If they fly together, the trip will be safer. They like to migrate to the same places every year. Do you know how they can find the same places? Scientists say that birds use the sun, moon and stars to help them. Other animals like moose (麋鹿) also migrate. Fish and whales swim to warmer water.

    Some animals don't have leave their homes. They hibernate in winter. They fall into a very deep sleep. The animals' temperature drops and their breathing slows down. Before the winter, these animals must eat too much food that they get very fat. If they don't eat enough, they may die when they are hibernating.

    A plant is a living thing. It uses its many parts to grow from a small seed to a large plant. Each part helps the plant stay healthy. Plants also need sunlight to grow. They get light from the sun and minerals from the soil. These things help the plant stay alive and grow.

    There are many kinds of ants(蚂蚁) in America. One is very strong. People are afraid(害怕) of it and animals are afraid of it, too.

    These ants are often in big groups(群). They eat all the animals on their way. They can kill(杀死) and eat elephants. And they can eat house. Sometimes they can kill people and eat them. When the ants come near, people leave their homes. But people are sometimes happy after the ants pass by (经过), because they can see no insects(昆虫) or snakes(蛇).

    Posted on 25 March by Selina

    I used to shower with soap every day, but my skin(皮肤)always felt dry and itchy(发痒的). Then two months ago, I heard of the no-soap movement. Since then, I've given up using soap in the shower. I still shower every day. I just don't use soap because it's filled with chemicals.

    So, what's so bad about using soap? Well, the chemicals in soaps can be harmful to our health. So, if we use soap, our skin will take in the chemicals, which will then end up in our bodies. According to the scientists, some of the chemicals used in a soap are quite dangerous. During my research, I also learnt that soap removes moisture(水分)from the body. This is actually why my skin was so dry and itchy.

    Getting used to washing my body without soap was a huge change. For the first week, I felt a bit dirty and I didn't smell great, either. However, during the second week, my skin felt clean without strange smell. Best of all, my skin problems disappeared, and now I have softer and healthier skin.

    On the whole, going soap-free has not only saved me time and money, but has also improved my skin. What's more, this experience has made me take a look at some of the other products I use in the shower, such as shampoo. More about that in my next blog!