As a result, songs sound like noise to an amusic. Many amuics compare the sound of music to pieces of metal hitting each other. Life can be hard for amusics. In fact, most people cannot understand what it feel like be amusic. Just going to a restaurant or a shopping center can be uncomfortable or even painful. That is why many amusics have to stay away from places where there is music. However, this can result in social loneliness. "I used to hate parties,"says Margaret, a seventy-year-old woman who only recently discovered that she was amusic. By studying people like Margaret, scientists are finally learning how to identify(辨别) this unusual condition.

  Scientists say that the brains of amusics are different for those of people who can enjoy music. The difference is complex(复杂的), and it is not connected with poor hearing. Amusics can understand other non-musical sounds well. They also have no problems understanding common speech. Scientists compare amusics to people who just can't see certain colors.

Many amusics are happy when their condition is finally diagnosed(诊断). For years, Margaret felt embarrassed about her problem music. Now she knows that she is not alone. That makes it easier for her to explain. "When people invite me to a concert, I just say "No, thanks. I'm amusic." says Margret.

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    ChaiJing, who worked for China Central Television (CCTV) from 2001 to 2013 as a TV reporter made a documentary(纪录片) named under the Dome （穹顶之下）to educate the public about smog. It is released（发行）online on March 1^st, 2015.

    In the opening of the documentary, Chai tells the story of her daughter with a begin tumor （良性肿瘤）before her birth. “ I couldn't help worrying while seeing the polluted sky in Beijing,” she says. She only took her daughter outside when the air in Beijing was good. The rest of the time she had to keep her at home like a “prisoner（囚犯）”. And there were175 polluted days in 2014 in Beijing.

    In the  documentary, Chai had an interview with a six-year-old girl, WangHuiqin, who live in Shanxi Province, a heavily polluted area in China. The girl told Chai that she had never seen stars, blue skies or white clouds in her village.

    Chai also went to London and Los Angeles, which had both suffered air pollution in the past, to learn how they had improved their environment.

    Chai spent one year making this 103-minute film, which cost her over 1 million yuan. In the documentary, Chai tries to answer three questions. They are “ What is smog”, “ Where does it come from?” and “What should people do?” And she calls on everyone to get into the fight against smog.

    On June 26th, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole “map” of the human body: DNA. DNA is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own. Now we can read some of this “map”, and so we can find out more about how our bodies work.

    People have been trying to understand the human body for a long time. In 1860, Gregory Mendel discovered that there is a special reason why we look the same as other people in our family. It is because of small things called “genes” that we have in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are really messages written in the DNA with a special language.

    In 1961, Marshall Nirenberg and Johann Matthaei found the first “word” that they could understand in that language, showing how DNA tells the cell to build its parts. This meant that one day we would be able to read all the messages that a human body gets from its parents' bodies. Scientists have now found all the words in DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help save people from several diseases. So the more we understand, the more doctors will be able to do.

    Most people hope that this will help to make better medicine and help people who are very ill. Other people worry about that when we learn more words and find out lots of other information, we still use it in the wrong way, just to make people more attractive, or stop sick people getting jobs.

E

    Saving the Earth shouldn't be so difficult，if we can do the following．

    First，we should take our time ． There is no need to hurry．We can walk or ride a bike to work．

    Second，we should smell the Each．Open the windows．Turn off the air-conditioner, and at the same time，save the energy．

    Third，we should enjoy cooking at home and having meals on our dinner table．So we can use our own bowls and chopsticks，not the plastic ones．

    Fourth，we should spend our weekends and holidays in the park playing games and just riding a bike around.

    Fifth，we should learn how to use old things well in the house，in the garden，or in the kitchen．

    Lastly, no one really has a mountain and a sea．Don't throw rubbish here and there．