Six volunteers are about to find out what it would be like to live on Mars without ever leaving the Earth. Three men and three women will spend eight months living in a special place on the side of a volcano in Hawaii. They are part of an experiment that is designed to mimic（模仿）life on Mars. Their mission began on October 15, 2014. NASA says it could send astronauts to Mars as early as the 2030s. The mission would take more than two years, so NASA needs to know how people would react to living in a small group, isolated from the rest of the world, for such a long time. Some people may become depressed or bored living under those conditions. By studying people living in similar conditions here on Eares NASA hopes to learn how to choose the most suitable people for a space mission, and how to help them get along.

    They will live in a two-story building. The ground floor is about 86 square meters, roughly the size of a small two-bedroom apartment. It includes shared areas like kitchen, dining room, bathroom, laboratory and an exercise room. The upstairs is less than half the size of the downstairs. It contains another bathroom and six small bedrooms. The building is located in an abandoned quarry（采石场）about 2,400 meters up the side of Mauna Loa, the second biggest volcano in the world. It is constantly monitored for signs of volcanic activity. NASA chose the location because the appearance looks very similar to Mars.

    To make it more like being on Mars in the future, they are only able to communicate by email during the experiment. Meanwhile, there will be a 20-minute delay between the time when a message is sent and that when it is received. When they go outside, they will have to suit up in full spacesuits, just as if they were on Mars.

    The commander is Martha Lenio, a 34-year-old Canadian. During the mission, she will run experiments on growing food. The other members have backgrounds in physics and so on. None of them are astronauts.

    No student of a foreign language needs to be told that grammar is complex. By changing the order of the words and by adding a range of auxiliary verbs (助动词) and suffixes (后缀), we can turn a statement into a question, state whether an action has taken place or is soon to take place, and perform many other word tricks to convey different meanings. However, the question which many language experts can't understand and explain is—who created grammar?

    Some recent languages evolved due to the Atlantic slave trade. Since the slaves didn't know each other's languages, they developed a make-shift language called a pidgin. Pidgins are strings of words copied from the language of the landowners. They have little in the way of grammar, and speakers need to use too many words to make their meaning understood. Interestingly, however, all it takes for a pidgin to become a complex language is for a group of children to be exposed to it at the time when they learn their mother tongue. Slave children didn't simply copy the strings of words used by their elders. They adapted their words to create an expressive language. In this way complex grammar systems which come from pidgins were invented.

    Further evidence can be seen in studying sign languages for the deaf. Sign languages are not simply a group of gestures; they use the same grammatical machinery that is found in spoken languages. The creation of one such language was documented quite recently in Nicaragua. Previously, although deaf children were taught speech and lip reading in the classrooms, in the playgrounds they began to invent their own sign system, using the gestures they used at home. It was basically a pidgin and there was no consistent grammar. However, a new system was born when children who joined the school later developed a quite different sign language. It was based on the signs of the older children, but it was shorter and easier to understand, and it had a large range of special use of grammar to clarify the meaning. What's more, they all used the signs in the same way. So the original pidgin was greatly improved.

    Most experts believe that many of the languages were pidgins at first. They were initially used in different groups of people without standardization and gradually evolved into a widely accepted system. The English past tense—“ed” ending— may have evolved from the verb “do”. “It ended” may once have been “It end-did”. It seems that children have grammatical machinery in their brains. Their minds can serve to create logical and complex structures, even when there is no grammar present for them to copy.

    A few days ago my wife sent me out to buy something. When I came home, I handed her a paper bag and said, "Here are the apples you wanted." She looked in the bag, and then she looked at me. "I told you," she said slowly, "to buy some eggs."

    I felt worried about my absent-mindedness (心不在焉，健忘) , so I went to see a doctor. He was a very kind man. "I have seen many people like you. It's nothing to worry about," he said. "If you know you are absent-minded, you are all right. But if you do not know you're absent-minded, you may be really in trouble."

    "Many famous people were absent-minded," the doctor told me. "Thomas Edison was standing in line one day to pay his taxes. When he arrived at the window, he found that he had forgotten his own name. He had to ask the man who was behind him to tell him who he was."

    I felt much better and got up to leave. "Thank you, doctor," I said. "How much do I have to pay you?"

    "Ten dollars for the check-up," the doctor said.

    "But doctor, I did not have a check-up!"

    For a moment the doctor looked puzzled. Then he said, "Oh, yes, it was the patient before you who had a check-up. How absent-minded I am!"

    “Has anyone seen Charge?” I asked, only half expecting a reply. The kids were running around the house, each doing their own thing, and my husband was watching the football game. Since she had only been out of sight for a few hours, I wasn't overly concerned. I thought she must be under one of the kids' beds, hiding from all the mess that was normal for a Sunday afternoon in our home.

    ①

    Charge was not good-looking, to put it kindly. It wasn't her fault; she was simply gifted with the worst appearance traits（特征）in her background.

    My husband had found Charge wandering along the freeway one day on his way home from work. She looked as though she hadn't eaten in weeks, so he stopped and fed her with bits of his leftover lunch. Not knowing what to do, he brought her home with the hope of finding her owners or at least a loving family that would take her. However, once she was in the house, the kids were determined not to let her go. After a day or two of begging, we unwillingly gave in and told them we could keep her.

    After observing her actions for days, I found she was extremely distrustful and afraid of everyone. In time, though, she came to love the kids and slept on their beds every night. I wondered if what she had experienced had conditioned her to be protective of those who were hurting. Every time the kids cried, Charge would run to them and gently offer her comforting paw（爪子）. Unlike our cat, who had recently given birth to five kittens, Charge would have been a great mother.

    ②

    When I was finally able to get everyone's attention at the dinner table, I asked again if anyone had seen Charge. After a unanimous（异口同声的）“No”, I decided to take a look around the neighborhood.

    ③

    “Charge!” I cried, because there she was in the closet! She looked up at me from inside the little cats' box as if to say,“ Shhh, I just got them to sleep!”

    We usually kept the closet door open a bit so our mamma cat could go in and feed her kittens, but she always left as soon as she finished nursing. Obviously, Charge knew they needed more mamma time and was more than willing to help out.

    ④

    The kids smiled upon seeing the dog with the kittens. My husband shook his head and said, “Only you, Charge. Only you!”

    Charge continued to mother the kittens until they were placed in their new homes. Charge may not have been an attractive dog, but she truly had her inner beauty.

    Mr. King lived with six hundred wild animals on the Greek Island of Kyklos. Ever since he left school, he had traveled all over the world collecting animals for his own zoo. He hoped to collect two examples of every kind of animal on his island. But he was afraid that people would find him someday.

    He wrote books about his travels and about his animals that he collected. The money from the books helped to pay for all the food those animals ate.

    One day, when Mr. King was out looking for drinking water, he found oil. He needed money for his travels and for his zoo, and a little oil would buy enough water for what he needed all his life, but he knew that if he told anyone else about it, it would be the end of his zoo and his life's work. So he decided not to tell anyone else about what he had found, because oil and water couldn't mix.

    The following are four famous malls in the world where you can not only purchase things but also enjoy entertainment.

    Mall of America (Minnesota, USA)

    This Mall has a theme park and a wedding church, where more than 5,000 couples have been married since its opening. The mall of America opened in 1992 and is the third largest mall in North America.

    The mall of America is the most visited shopping mall in the world, with more than 40 million visitors annually. Spending 10 minutes in every store would take shopper more than 86 hours to complete their visit to the Mall of America.

    Mall of the Emirates (Dubai)

    The mall of the Emirates is an entertainment and shopping resort located in Dubai. It offers a full range of shopping, leisure and entertainment facilities.

    This shopping center is home to over 450 retailers（零售商）and also features a complete range of entertainment options, including Ski Dubai, the first indoor ski destination in the middle East.

    West Edmonton Mall (Alberta, Canada)

    The fifth largest mall in the world and the largest in North America, it has the largest indoor water park, which has the biggest wave pool in the world.

    The mall has a theme park called Galaxyland, with a number of attractions, including a roller coaster. In addition, the mall has an indoor lake, which is home to four sea lions.

    The Dubai Mall (Dubai)

    The Dubai Mall is the world's largest mall in total area.

    The mall has 1,200 shops and houses an aquarium（水族馆）which earned the Guinness World Record for the world's "largest Acrylic Panel". The mall is also home to an ice rink（溜冰场）, a 250-room luxury hotel and 22 cinema screens, plus 120 restaurants and cafes. It's also famous for the unique "malls-within-a-mall" concept, with themed shopping area like Gold Souk, Fashion Island and The Grove, an indoor-outdoor streetscape with a fully retractable（可缩回的）roof.