The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on well with their parents, which is the opposite of the popularly-held image of unhappy teenagers locked in their room after endless family quarrels.

    An important new study into teenage attitudes surprisingly shows that their family life is more harmonious than it had ever been in the past. “We were surprised by just how positive today's young people seem to be about their families,” said one member of the research team. “They're expected to be rebellious(叛逆的) and selfish but actually they have other things on their minds: they want a car and material goods, and they worry about whether school is serving them well. There's more negotiation(商议) and discussion between parents and children, and children expect to take part in the family decision-making process. They don't want to rock the boat.”

    So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends. “My parents are happy to discuss things with me and willing to listen to me,” says 17-year-old Daniel Lazall. “I always tell them when I'm going out clubbing. As long as they know what I'm doing, they're fine with me.” Susan Crome, who is now 21, agrees. “Looking back on the last 10 years, there was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that.”

    Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenage rebellion(反抗) is not rooted in real facts. A researcher comments, “Our surprise that teenagers say they get along well with their parents comes because of a brief period in our social history when teenagers were regarded as different beings. But that idea of rebelling and breaking away from their parents really only happened during that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth change from helping out with the family business to taking it over. ”

    Mom wanted only one thing for her birthday. “Can you find me another copy of this song?” she asked, and handed me a worn-out cassette tape (磁带). I knew exactly what was recorded on it: My Redeemer (救世主). I heard the song played at least a thousand times while growing up. After so many years, the cassette tape was too worn out to be used. I promised her I would find a replacement.

    My Redeemer became Mom's favorite song after my younger brother Tim was killed by a drunk driver in 1973. The only thing that helped her calm down was the soulful sound of My Redeemer from the local radio station.

       We recorded it on a cassette tape so she could listen to it any time she wanted but none of us knew who the soloist (独唱者) was. These days, I thought the song would be easy to find out. I went home and searched the Internet. Several songs with that title popped up, but none of them was the one Mom loved. I got frustrated.

    Mom's birthday drew near and then one day, I was driving home, listening to our local radio station. A familiar tune came on. It was My Redeemer! As soon as I could, I phoned the station. I got a line on the soloist, who was called Alan Parks. I typed his name into Google and found his home number in South Carolina. Minutes later, I was telling him how much his recording meant to Mom. He offered to ship two CDs out to me personally. I gave him my address.

    'Red Lion, Pennsylvania?' he said. 'Do you know the Logans?' 'They are our neighbors!' 'I've been friends with them for 25 years,' Alan said. 'They'll be at my concert at York Gospel Chapel on April 17th. Would you and your mom come too” We sure would. Mom was excited to hear Alan sing My Redeemer to her, live in concert —on the evening of her 87th birthday.

    Exposing living tissue to subfreezing temperatures for long can cause permanent damage. Microscopic ice crystals (结晶体) cut cells and seize moisture (潮气), making donor organs unsuitable for transplantation. Thus, organs can be made cold for only a few hours ahead of a procedure. But a set of lasting new antifreeze compounds (化合物)—similar to those found in particularly hardy (耐寒的) animals—could lengthen organs' shelf life.

    Scientists at the University of Warwick in England were inspired by proteins in some species of Arctic fish, wood frogs and other organisms that prevent blood from freezing, allowing them to flourish in extreme cold. Previous research had shown these natural antifreeze molecules (分子) could preserve rat hearts at -1.3 degrees Celsius for up to 24 hours. But these proteins are expensive to extract (提取) and highly poisonous to some species. “For a long time everyone assumed you had to make synthetic (人造的) alternatives that looked exactly like antifreeze proteins to solve this problem, ”says Matthew Gibson, a chemist at Warwick who co-authored the new research. “But we found that you can design new molecules that function like antifreeze proteins but do not necessarily look like them.”

    Most natural antifreeze molecules have a mixture of regions that either attract or repel water. Scientists do not know exactly how this process prevents ice crystal formation, but Gibson thinks it might throw water molecules into push-pull chaos that prevents them from tuning into ice. To copy this mechanism, he and his colleagues synthesized spiral-shaped molecules that were mostly water-repellent—but had iron atoms at their centers that made them hydrophilic, or water-loving. The resulting compounds were surprisingly effective at stopping ice crystals from forming. Some were also harmless to the roundworm Caenorhabditis elegans, indicating they might be safe for other animals.

    “These compounds are really cool because they are not proteins—they are other types of molecules that nonetheless can do at least part of what natural antifreeze proteins do, ”says Clara do Amaral, a biologist at Mount St. Joseph University, who was not involved in the research. Gibson's antifreeze compounds will still need to be tested in humans, however, and may be only part of a solution. “We don't have the whole picture yet,”do Amaral adds. “It's not just one magical compound that helps freeze-tolerant organisms survive. It's a whole suite of adaptations.

    Can you imagine how great the United Kingdom is? The queen of Britain, Queen Elizabeth II, is also the queen of other 16 countries, including Australia, New Zealand, Canada and Jamaica. Her face is seen on stamps and coins all around the world.

    Elizabeth Alexandra Mary Windsor was born in London on April 21st 1926. Her parents were George, the Duke of York, and Elizabeth, the daughter of the Earl and Count-ness of Strathmore. As a child, Princess Elizabeth lived with her parents and younger sister in London and Windsor. Every summer, she traveled to Scotland to visit her mother's parents. She was interested in all sorts of sports, but her favorites were horse riding and swimming. She was also fond of acting, art and music.

    As princess Elizabeth grew older, she started to play a part in British public life. When she was 14, she broadcast a radio message to all the children of Britain and the Common-wealth(共和国). Two years later, she carried out her first public engagement, and started to go on official tours shortly after that. After a tour to South Africa in 1946, she married Philip Mountbatten. The couple had four children: Prince Charles, born in 1948, Princess Anne, born in 1950, Prince Andrew, born in 1960 and Prince Edward, born in 1964.

    After her father died, Princess Elizabeth became Queen Elizabeth II in a ceremony held in London in 1953. As a queen, she has many duties, and leads a very busy life. She travels throughout the world, meeting the leaders of other countries, and attends a large number of official functions. She also holds a meeting every week with the British Prime Minister. Every year, on Christmas Day, she broadcast a message to the people of British and the Commonwealth, talking about her hopes for the future.

    Queen Elizabeth has been on the throne for more than 40 years and has become one of the most famous women in the world. Lots of people in British believe that she tries hard to understand her people and be a good queen. More than her title, this quality has earned her much love and respect.

    I am Henry Jekyll. I was born in the 1 800s. I inherited(继承) a large fortune, a healthy body and an excellent mind. I was naturally hard-working and soon I was very successful in my job. So the outside world saw a serious, hard-working, successful doctor. Behind this quiet character, however, was a wild, fun-loving, irresponsible young man. Both of them were me. They lived together in the same body.

    “Was it possible," I wondered, “to find a drug that could give each side of my character its own separate face and body?"

    After much thought and careful study I believed I had found the answer. I had read many scientific books and spent many hours in my laboratory, searching for the right mixture of chemicals to make my drug. At last I got everything ready.

    Late one night, I mixed everything together and prepared my drug. I watched the smoke rising from the liquid as its color changed from red to purple and at last to green. Then, bravely, I drank every bitter drop.

    I felt a violent sickness in my stomach and a terrible pain in all my bones. The room seemed to turn round and round and I trembled with fear. Then the fear and pain disappeared and a strange, sweet feeling took its place. Wild thoughts danced through my mind- the wild passions of an evil and cruel stranger. But inside myself I felt younger, lighter, more carefree than ever before. "If this is pure evil," I thought, “I like it.”

    I stood there, enjoying these strange new thoughts and passions and suddenly realized that I was shorter. So I decided to go to my bedroom in my new body and take a look at myself in the mirror there. As I came into my room, I saw Edward Hyde for the first time.

    At that time, the good side of my character was stronger than the evil side. Henry Jekyll had his faults, but he was mostly a good, kind man. I believe that is the reason why Edward Hyde was so much smaller than Henry Jekyll. But that was not the only difference between the two men. Henry Jekyll had a kind, open, honest face. But pure evil stared out of Edward Hyde's eyes. I felt no dislike, however. Indeed, I welcomed him. Edward Hyde was me, young and strong and full of life.

    A new study shows students who write notes by hand during lectures perform better on exams than those who use laptops.

    Students are increasingly using laptops for note-taking because of speed and legibility(清晰度).But the research has found laptop users are less able to remember and apply the concepts they have been taught.

    Researchers performed experiments that aimed to find out whether using a laptop increased the tendency to make notes "mindlessly" by taking down word for word what the professors said

    In the first experiment, students were given either a laptop or pen and paper .They listened to the same lectures and were told to use their usual note-taking skills. Thirty minutes after the talk, they were examined on their ability to remember facts and on how well they understood concepts.

    The researchers found that laptop users took twice as many notes as those who wrote by hand. However, the typists performed worse at remembering and applying the concepts. Both groups scored similarly when it came to memorizing facts.

    The researchers' report said, "While more notes are beneficial, if the notes are taken mindlessly, as is more likely the case on a laptop, the benefit disappears."

    In another experiment aimed at testing long-term memory, students took notes as before but were tested a week after the lecture. This time, the students who wrote notes by hand performed significantly better on the exam.

    These two experiments suggest that handwritten notes are not only better for immediate learning and understanding, but that they also lead to superior revision in the future.