America is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while — then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can be quite difficult for us Chinese to understand, because friendships between us flower more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.

    Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.

    Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don't show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may be generous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. The Americans, however, express their welcome usually at homes, but truly can not manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves treated hospitably.

    For the Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!

    They may be teenagers, but 17-year-old Brittany Bull and 16-year-old Sesam Mngqengqiswa have grand ambitions(雄心) — to launch Africa's first private satellite (卫星) into space. They are part of a team of high school girls from Cape Town, South Africa, who have designed and built equipment for a satellite that will orbit over the earth's poles scanning Africa's surface.

    Once in space, the satellite will collect information on agriculture, and food security within the continent. Using the data/we can try to determine and predict (预测) the problems Africa will be facing in the future”, explains Bull, a student at Pelican Park High School.“Where our food is growing, where we can plant more trees and vegetation and also how we can monitor remote areas,” she says. “We have a lot of forest fires and floods but we don't always get out there in time.'' Information received twice a day will go towards disaster prevention.

    It's part of a project by South Africa's Meta Economic Development Organization (MEDO) working with Morehead State University in the US.

The girls (14 in total) are being trained by satellite engineers from Cape Peninsula University of Technology, in an effort to encourage more African women into STEM (science, technology, engineering, mathematics).

    Scheduled to launch in May 2017, if successful, it will make MEDO the first private company in Africa to build a satellite and send it into orbit.

    Mngqengqiswa comes from a single parent household. Her mother is a domestic worker. By becoming a space engineer or astronaut, the teenager hopes to make her mother proud. “Discovering space and seeing the Earth's atmosphere, it's not something many black Africans have been able to do, or get the opportunity to look at I want to see and experience these things for myself,” says Mngqengqiswa.

    Her team mate Bull agrees, “I want to show to fellow girls that we don't need to sit around or limit ourselves. Any career is possible-even aerospace.”

    Not many years ago, a wealthy and rather strange old man named Johnson lived alone in a village in the south of England. He had made a lot of money in trading with foreign countries. When he was seventy-five, he gave £ 12,000 to the village school to buy land and equipment for a children's playground.

    As a result of his kindness, many people came to visit him. Among them was a newspaperman. During their talk, Johnson said that he was seventy-five and expected to live to be a hundred. The newspaperman asked him how he managed to be healthy at seventy-five. Johnson had a sense of humor. He liked whisky and drank some each day. "I have an injection (注射) in my neck each evening." He told the newspaperman, thinking of evening glass of whisky.

    The newspaperman did not understand what Johnson meant. In his newspaper he reported that Johnson was seventy-five and has a daily injection in his neck. Within a week Johnson received thousands of letters from all over Britain, asking him for the secret of his daily injection.

    Gus Wenner runs Rollingstone.com; his father gave him the job. But Jann Wenner, the magazine's co­founder and publisher, was quick to assure critics of the appointment process that his son is terribly talented and had to prove himself before being given the post. Apparently Gus worked his way up from more junior positions with the company, and demonstrated, according to his father, the “drive and discipline and charm, and all the things that show leadership.” Gus Wenner is 22 years old.

    He is certainly not the only kid out of college, or even out of high school, working at daddy's firm. Family contacts are a common way of finding both temporary internships and longtime careers. Opportunities for the children of top 1 percent are not the same as they are for the 99 percent.

    This is hardly a shock, but it is precisely the type of inequality that reveals the hard­ to­ define promise of the “Just Do It” version of the American dream and deepens our cynicism(愤世嫉俗) about how people get ahead. As a consequence, it weakens support for public policies that could address the lack of upward mobility among children born at the bottom, who ought to be given priority. A strong tie between adult outcomes and family background annoys Americans. When an organization conducted a nationally representative survey asking about the meaning of “the American dream”， some typical answers included: “Being free to say or do what you want” and “Being free to accomplish almost anything you want with hard work.” but also “Being able to succeed regardless of the economic circumctances in which you were born.”

    This is exactly the reason that “the American dream” is not only a defining metaphor for the country, but also why Americans have long been willing to tolerate a good deal more economic inequality than citizens of many other rich countries. A belief in the possibility of upward mobility not only morally justifies inequality as the expression of talents and energies, but also extends a promise to those with lower incomes. After all, why would you be a strong advocate for reducing inequality if you believe that you, or eventually your children, were likely to climb the income ladder?

    Hard work and perseverance(毅力) will always be ingredients for success, but higher inequality has made having successful parents, if not essential, certainly a central part of the recipe.

    The belief that talent is something you are born with, and that opportunities are open to anyone with ambition and energy, also has a dangerous consequence. When the public policy is focused on the difficult situation of the poor, this belief can help the concept resurface that the poor are “undeserving” and are the authors of their own situation. Yet we actually know a good deal about why children of the poor have a higher chance of being stuck on poverty as adults.

    The recipes for breaking this intergenerational trap are clear: a nurturing(培养) environment in the early years combined with accessible and high­quality health care and education promote the capacities of young children, heighten the development of their skills as they grow older, and eventually raise their chances of upward mobility.

    Talent is nurtured and developed, and even genes are expressed differently depending upon environmental influences.

    The 1 percent are the goal for these upper­middle­class families, who after all have also experienced significant growth in their relative standing. The graduate and other higher degrees that they hold, for which they put in considerable effort, have put them on the upside of the wave of globalization and technical change that has transformed the American job market.

    An age of higher inequality gives them both more resources to promote the capacities of their children, and more encouragement to make these investments since their children now have all the more to gain.

    For them, an American dream based on effort and talent still lives, and as a result they are less likely, with their considerable cultural and political influence, to support the reshaping of American public policy to meet its most pressing need: the future of those at the bottom.

    Are some people born clever, and others born stupid? Or is intelligence developed by our environment and our experiences? Strangely enough, the answer to both these questions is yes. To some extent our intelligence is given to us at birth, and no amount of special education can make a genius out of a child born with low intelligence. On the other hand, a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of a person's intelligence are fixed at birth, but whether or not he reaches those limits will depend on his environment. This view, now held by most experts, can be supported in a number of ways.

    It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random (随机地) from the population, it is likely that their degrees of intelligence will be completely different. I f on the other hand we take two identical (完全相同的) twins they will very likely be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence, and this clearly suggests that intelligence depends on birth.

    Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We would soon find differences in intelligence developing, and this indicates that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close contact with each other, but who are not related at all, are likely to have similar degrees of intelligence.

    About twenty of us had been fortunate enough to receive invitations to a film­studio (影棚) to take part in a crowd­scene. Although our “act” would last only for a short time，we could see quite a number of interesting things.

    We all stood at the far end of the studio as workmen prepared the scene，setting up trees at the edge of a winding path. Very soon, bright lights were turned on and the big movie­camera was wheeled into position. The director shouted something to the camera operator and then went to speak to the two famous actors nearby. Since it was hot in the studio, it came as a surprise to us to see one of the actors put on a heavy overcoat and start walking along the path. A big fan began blowing tiny white feathers down on him, and soon the trees were covered in “snow”. Two more fans were turned on，and a “strong wind” blew through the trees. The picture looked so real that it made us feel cold.

    The next scene was a complete contrast (对比). The way it was filmed was quite unusual. Pictures taken on an island in the Pacific were shown on a glass screen (幕). An actor and actress stood in front of the scene so that they looked as if they were at the water's edge on an island. By a simple trick like this, palm trees, sandy beaches, and blue, clear skies had been brought into the studio!

    Since it was our turn next，we were left wondering what scene would be prepared for us. For a full three minutes in our lives we would be experiencing the excitement of being film “stars”！