Have you ever seen the movie. Big Hero 6 ? Baymax(大白) is a main character in the movie. He's a friendly big robot that looks after people's health. If there is a robot like Baymax in our real life， people will get more benefits. The robot will be especially helpful in caring for the old. The health of old people needs greater monitoring and care.

    Scientists in America are now working to make Baymax a really(实现)- Actually. They have already produced some health care robots. These robots provide brain video games to improve people's memory. The garner can help the old remember things for longer. Besides， these  provide special app (应用程序） to help the old manage their health at home. The apps can check  the old people' heart rate (心率) and tell them to take their medicine on lime. The apps can also record their daily activities. Such collected information helps doctors discover the cause of an illness faster and more correctly. But the health care robots are't as clever as Baymax yet.

    Nowadays，scientists are working on improving the health care robots. They pope the robots can produce electricity by walking across the floor. If they succeed. batteries will not be needed. They also hope the robots communicate with humans in the daily life so to make people happier and healthier.

    Scientists are trying to realize these dreams. Like Baymax， these health care robots may save people's lives in the future. We are looking forward to them.

    According to a national study, in the summer of 2013, the long-term(长期的) warm weather in the UK has made the number of butterflies increase.

    Around 46,000 volunteers(志愿者) took part in the year's Big Butterfly Count(统计), and they found 830,000 butterflies.Volunteers were asked to make a record.They would record how many times they found one of 21 different kinds of butterflies.

    Later, the scientists used the records to find out how many butterflies of different kinds were found across the country.Then, they compared the results to the year before.They found that there was a rise in the number of 15 kinds of butterflies, and some of them went up by 50% compared to recent years.They said the increase in butterfly numbers was a result of warm weather.

    However, scientists also said that the number of butterflies was in decline(下降) as a whole, and that we might not see the same result the next year.

    Richard Fox, who works for Butterfly Conservation, said, “UK butterflies are in long-term decline.Studies have been done since the 1970s.They show that UK butterflies have declined in type and number.”

    He added, “We must halt the long-term decline of these beautiful creatures(生物).The only way is by stopping the damage that has been done to the butterflies' habitats(栖息地) across the UK.”

    Some people claim they" never forget a face". But what does that saying mean? Is there really no limit to the number of faces a person can remember? A new study at the University of York in England has found that, on average, people can remember as many as 5,000 faces.

    The study is the first time that scientists have been able to put a number to the abilities of humans to recognize faces. The research team tested people on how many faces they could remember from their personal lives and in the media. They also tested them to see how many famous faces they recognized. Rob Jenkins works in the psychology department at the University of York. He said the researchers' study centered on the number of faces people actually know. He said the researchers were not able to discover whether there is a limit on how many faces the brain can handle.

    In the study, people spent one hour writing down as many faces from their personal lives as possible. At first, they found it easy to come up with many faces. But by the end of the hour, they found it harder to think of new ones. Their change in speed let the researchers estimate when they would have run out of faces completely.

    The results showed that these people knew between 1,000 and 10,000 faces. Jenkins explained that some people may have a natural ability for remembering faces." There are differences in how much attention people pay to faces and how well they process the information," he said. Jenkins also said it could be because of different social environments. Some people may have grown up in more populated places. Therefore, they may have had more social contact throughout their lives.

    The people in the study included 25 men and women between 18 and 61 years old. Researchers think age may be an interesting area for further research. "It would be interesting to see whether there is a peak age for the number of faces we know", Jenkins said. He said it is possible that we gather more faces throughout our lifetime. But, he added, there also may be an age at which we start to find it harder to remember all of those faces.

    The study suggests our facial recognition abilities enable us to deal with the many different faces we see on the screens, as well as those we know, like family and friends. Today, facial recognition technology is used in many ways, including by law enforcement agencies to prevent crime and violence. Governments use it to keep secret areas secure and, in extreme cases, control populations. .Even Facebook uses facial recognition. For example, when you "tag" or name a friend, Facebook technology may recognize the person's face from a different picture you had shared before.

Here are four clothing stores.

Notes: £ means the cheapest; £ £ £ £ means the most expensive;

★ means friendly; ★★★★ means the friendliest