A new book called “Battle Hymn of the Tiger Mother” by Amy Chua has caused a debate (争论) about cultural differences in parenting. Amy Chua is a teacher in an American university and both of her parents are Chinese. In the book, Ms. Chua writes about how she taught her daughters. She told NBC television that she had a clear list of what her daughters were not allowed to do, such as having a play date, watching TV or playing computer games and getting any grade less than an A.

    Many people are against Amy Chua's parenting style (风格), even her husband, who is American. They say it is rude and unfair to children. But she says her parents raised her and her three sisters in that way.

    Ms. Chua says after her younger daughter shouted “I hate my life! I hate you!” she decided to retreat because she was afraid of losing her daughter. But she also says American parents often have low expectations of their children's abilities.

    “The debate is about what it means to be a successful parent and what it means to be a successful child,” said Stacy DeBroff, who has written four books on parenting. She says Amy Chua's parenting style is not limited to Chinese families. It is a traditional way of parenting among immigrants (移民). They hope to get a better future for their children.

    She also sees a risk (风险). When children have no time to be social or to develop their own interests, they might not develop other skills that they need to succeed in life. DeBroff advises parents to develop their own style of parenting and not just repeat the way they were raised.

    First, I want to tell you how proud we are. Getting into Columbia shows what a great well-rounded student you are. Your academic, artistic, and social skills have truly blossomed（开花）in the last few years. You have become a talented and accomplished young woman. You should be as proud of yourself as we are.

    College will be the most important years in your life. It is in college that you will truly discover what learning is about. I want to tell you: “education is what you have left after all that is taught is forgotten”. What I mean by that is the materials taught isn't as important as you gaining the ability to learn a new subject, and the ability to analyze a new problem. That is really what learning in college is about—this will be the period where you go from teacher-taught to master-inspired, after which you must become self-learner.

    Follow your passion in college. Take courses you think you will enjoy. Steve Jobs says when you are in college, your passion will create many dots, and later in your life you will connect them. In his great speech given at Stanford, he gave the great example where he took calligraphy（书法）, and a decade later, it became the basis of the beautiful letters in Microsoft Word. So don't worry too much about what job you will have, and don't be too utilitarian（功利的）, and if you like Japanese or Korean, go for it! Enjoy picking your dots, and be assured one day you will find your calling, and connect a beautiful curve through the dots.

    Most importantly, make friends and be happy. College friends are often the best in life, because during college you are closer to them physically than to your mom and I. Pick a few friends and become really close to them-pick the ones who are honest and sincere to you. Don't worry about their hobbies, grades, looks, or even personalities. You have developed some real friendships in high school in your last two years, so trust your instinct, and make new friends.

    College is the four years where you have the greatest amount of free time, the first chance to be independent, the most possibilities to change and the lowest risk for making mistakes. So please treasure your college years! May Columbia become the happiest four years in your life, and may you blossom into just what you dream to be.

    Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop drought and flood.

    Unluckily, in many parts of the world, man has not found that the third of these points is the most important. Man wants to make money from trees, so he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And also, he is usually too careless to plant and look after new trees. So the forests slowly disappear.

    This does not only mean that man will have fewer trees. The results are even worse: for where there are trees, their roots break up soil-make the rain in-and also bind the soil, thus stopping it from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When all the top-soil is gone, nothing is left but useless desert.

    It is widely acknowledged that nearly every kid might come across some kind of school bullying(欺侮), however, the age at which kids were first bullied could influence how strongly they are affected, suggests a new study. And, surprisingly, it is not the youngest kids who are hurt the most in the long term.

    Bullying can have long-lasting effects, but particularly when it begins in adolescence(青春期), the researchers say, people subjected to either verbal or physical bullying are known to be at greater risk of developing depression, anxiety disorders or to behave violently. But not everyone reacts in this way.

    Children who were bullied for the first time before they hit adolescence seem to get over it, but those who are bullied for the first time later on in adolescence seem to become more aggressive(富有攻击性的) or are more likely to turn to drinking as a means of coping with it. These are the conclusions of psychologists Matthew Newman and colleagues of Texas at Austin, US.

    The team gave questionnaires to nearly 1,500 college students about their experience of physical and psychological bullying before adolescence- before high school- and in late adolescence- at high school. They assessed mood and mental state, judging by signs of anxiety or depression, such as sleeplessness. The group was also questioned about how they would react to certain challenges, such as humiliation.

    People who were bullied all showed slightly higher levels of stress. But while those bullied earlier in life seemed to respond normally to provocation (煽动), people bullied for the first time late in adolescence are more withdrawn and sensitive to violence.

    There are also sex differences between those bullied for the first time during adolescence: females are more likely to react aggressively when provoked and males are much more likely to turn to drinking to escape bad situations. The best solution in all cases was strong social support, whether from friends, family or school. Those with no one to share their problems with suffered the most.

    So perhaps it is best not to shelter children completely from bullying early on, suggests Newman, "They may get stressed, but unhealthy coping really jumps out when they are bullied for the first time later on."

    In one of the old buildings near our school, one could see an old man sitting by a large window on the first floor. His name was James. During the three years at school, I had hardly ever found him missing from his usual position.

    He was a high-ranking government official and lived happily with his wife. Once there was a bus accident, in which a number of passengers were seriously injured and were taken to the hospital for treatment. James was responsible for the rescue operation. It was a big hospital, but James was shocked to notice how ill-equipped it was. There were no enough life-saving drugs and life—supporting equipment.  The injured and their companions had to struggle there. James attempted to help. However, though he emptied his pockets, many of them died that day.

    That was a turning point in his life. He made a decision to devote his life to helping others, particularly the poor and needy patients and their companions. He began spending much of his income on these people. Since this required a lot of time and energy, he found it difficult to fulfill(履行) his official duties and therefore chose to retire, which, in turn, reduced his income considerably.

    His wife was deeply worried. Most of the time, James was out and paid least attention to home affairs. Meanwhile, as he was spending a lot helping others, she had to struggle even to meet the household expenses. Though she was not opposed to his helping the poor, she urged him not to overlook his own life and home, but it had no effect on him. One day they had a heated argument and in the end she left him, never to return. Though he continued with his work, this was a great blow and did serious harm to his health and enthusiasm and was soon forced to stay indoors. That was when he took his position by the window, spending his time looking outside.

    A few weeks after my graduation, I returned to school, only to find the buildings gone. I heard that they were torn down. All the people left except James. He refused to go and the next morning, he was found at his usual place by the window, dead.

    Slowly but surely  we're moving closer and closer to 5G world. From smart-home security to self-driving cars, all the internet-connected devices in your life will be able to talk to each other at lightning-fast speeds with reduced delay, Objectively speaking, the fastest 4G download speeds in the U. S. top out at an average of 19.42 Mbps. But by comparison 5G promises gigabit (千兆) speeds.

    “5G is one of those signs, along with artificial intelligence, of this coming data age,” said Steve Koenig, senior director of market research for the Consumer Technology Association. “The self-driving vehicle is a great emblem of this data age, and that is to say, it is a sign of time, because with one single task, driving, you have massive amounts of data coming from the vehicle itself, and a variety of sensors are collecting a lot of information to model its environment as it moves. It's pulling in data from other vehicles about road conditions down the lane. It could be weather information, but also connected infrastructure (基础设施) construction. There's lots of data behind that task, which is why we need high speed.

    Augmented reality glasses and virtual headset haven't yet broken the mainstream, but tech companies are joyfully betting that these devices will eventually replace our smartphones. With 5G, that could actually happen. This is notable because companies such as Apple are reportedly developing AR glasses to assist — or perhaps even replace — smartphones.

    Ericsson stated at February's Mobile World Congress how smart glasses could become faster and lighter with a 5G connection, because instead of being weighed down with components, the glasses could rely on hardware for processing power.

    But don't get too excited. There's still a lot of work to be done in the meantime, including various trials to make sure the radios play nicely with hardware and infrastructure construction so 5G isn't concentrated only in big cities.