One form of social prejudice against older people is the belief that they cannot understand or use modern technology. Activities like playing computer games, going on the Net and downloading MP3s are only for the youngsters. Isn't it unfair that older people enjoying a computer game should be frowned(皱眉) upon by their children and grandchildren?

    Nowadays older people have more control over their lives and they play a full part in society. Moreover, better health care has left more people in their sixties and seventies feeling fit and active after retirement. Mental activity, as well as physical exercise, can contribute to better health. Playing computer games is a very effective way of exercising the brain.

    When personal computers were first introduced, most older people didn't believe they would ever familiarize themselves with it. Now computers have been around for a few generations and retired people have gradually become more relaxed about using them for fun. Gamers over 65 prefer playing puzzle games and card games. Kate Stevens, aged 72, says: “I find it very relaxing. It's not very demanding, but you still need to concentrate.”

    Another development that has favored “grey games” is a change in the type of videogames available on the market. There's a greater variety of games to choose from, including more intellectual and complex strategy(策略) and simulation(模拟) games. Internet Chess and Train Simulator are among the most popular of these. Train Simulator is based on real-world rail activities. Players can choose from a variety of challenges, such as keeping to a strict-timetable and using helper engines during a winter storm.

    Some people argue that “grey gamers” simply don't have the skills required for computer games, and that teenagers are better. This couldn't be further from the truth. Most computer games require the kind of analytical thinking that improves with practice, which means that the “grey gamers” may well be far better than gamers half a century younger than them. In games where speed is the main consideration, older people would be at a disadvantage because they may have slower reaction times. On the other hand, “grey gamers” have a preference for slower paced, mind challenging games.

    For incoming freshmen at western Connecticut's suburban Brookfield High School, lifting a backpack weighed down with textbooks is about to give way to tapping out notes and touching electronic pages on an iPad. A few hours away, every student at Burlington High School near Boston will also start the year with new school-issued ipads, each loaded with electronic textbooks and other online resources in place of traditional texts. Apple officials say they know of more than 600 districts that have launched what are called " one-to-one " programs.

    At Burlington High in suburban Boston, Principal Patrick Larkin says the $500 ipads is better than textbooks in the long term, though he said the school will still use traditional texts in some courses if suitable electronic programs aren't yet available. Larkin said of textbooks, " but they're pretty much outdated the minute they're printed and certainly by the time they're delivered".

    But some experts warn that the districts need to ensure they can support the wireless infrastructure (设施 ), repairs and other costs that accompany a switch to such a tech-heavy approach. Mark Warschauer, an education and informatics(信息学)  professor said,  "I think people will like it.I really don't know anybody in high school that wouldn't want to get an iPad," he said. "We're always using technology at home, then when you're at school it's textbooks. So it's a good way to put all of that together." Districts are varied in their policies on how they police students' use.

    And the nation's textbook publishing industry, accounting for $ 5.5 billion in yearly sales to secondary schools, is taking notice of the trend with its own shift in a competitive race toward developing curriculum specifically for ipads.Jay Dickey, executive director of the Association of American Publishers'schools division, said all of the major textbook publishers are moving toward electronic offerings, but at least in the short term, traditional bound textbooks are here to stay. "I think one of the real key questions that will be answered over the next several years is what sort of things work best in print for students and what sort of things work best digitally."

How to Survive Exam Stress

    Exam time is one of the most stressful in school, whether it is high school, college or graduate school. Even the best students feel the pressure. The first sign of a problem while preparing for an exam is worry{#blank#}1{#/blank#} If we can get rid of worries, or at least control them, then we're in a much better position to do well on our tests. Take the following steps to survive exam stress and increase your overall performance as a result.

    {#blank#}2{#/blank#}What causes you anxiety when you are studying? Too much noise? Then move to a quieter place. Delayed work? Catch up with your studies a couple nights before. That way you can save the final night before the exam to review and get a good night of sleep.

    The second way to deal with worry is to displace thoughts. Suppose you wake up at three in the morning and you're worried about an exam. What do you do?{#blank#}3{#/blank#} Doing something productive might allow you to sleep better when you finally do go back to bed.

    Another way to displace negative thoughts is to do something physically active. Work out. Take a quick walk or a nice run{#blank#}4{#/blank#}For example, I might worry about the exam having surprise questions that I'm not prepared to answer. But I can shove those thoughts aside by reminding myself that I've taken many exams and I've handled surprise questions before.

    The third option is to treat the symptoms. Keep things in perspective. Think of one final exam that causes you the most anxiety. Now think of the worst thing that could happen. If you've prepared, then likely the worst grade you could get is a C. And, if you've been applying what we've been talking about, then you'll likely to do no worse than a B. {#blank#}5{#/blank#}

A. How bad is that really?

B. The first is to delete the causes.

C. Another idea is to think positive thoughts.

D. Worry robs us of energy, focus and motivation.

E. How about getting up and studying for an hour?

F. What we should do is to think positively and get rid of it.

G. So just face the result bravely and make an effort to improve your grade.

    As sea levels climb, even Washington, D. C. could see more frequent and widespread flooding at high tide.

    Strong storms and high winds sometimes bring floods to coastal areas. But cities and towns along the US East Coast are flooding even in calm and sunny weather. Among them is Maryland's capital Annapolis. Tourists there must sometimes walk through water flooding downtown streets surrounding the habor. Sometimes water covers roads in Atlantic City, N. J. Even the yards and basements of coastal homes near New York City sometimes flood.

All are suffering from this trend—normal high tides surpass (超过) a rising sea level.

    Sea levels have climbed, on average, about 20 centimeters (8 inches) over the past 135 years. And a sharp increase in tide flooding is one of the more visible impacts affecting many coastal areas, notes William Sweet, an oceanographer.

    Sweet and his co-workers recently analyzed data from 45 tide gauges (计量表) along the US coasts. These tools record the changing heights of tides as they rise and fall. From these data, Sweet's team calculated the number of : “troublesome floods” in various coastal cities. These floods, Sweet explains, typically occur when water level is about 30 centimeters (1foot) above the historic level of the highest tides. In June 2014, the team reported finding a growing rise in these flooding events.

    In Charleston, S.C. from 1957 to 1963, the city experienced troublesome floods an average of 4. 6 days per year. Bur from 2007 to 2013, the occurring rate of troublesome floods jumped five times. Annapolis city was even more serious. From1957 to 1963，troublesome floods were roughly 3. 8 days per year. From 2007 to 2013, the average was 10 times higher- 39. 3days a year.

    “Over the next few decades, climate change probably drives sea levels even higher,” Sweet says. “So today's flooding problems promise to become only more widespread and frequent.”

    Nearly everyone has bad habits. That's because, try as we might, bad habits are hard to break. On the other side, good habits, such as eating more healthfully or exercising regularly, never seem to stick. As a result, most people throw up their hands and surrender.

    But now a new book, Better Than Before: Mastering the Habits of Our Everyday Lives by best-selling author Gretchen Rubin, offers some useful solutions.

    Rubin, who became interested in habits during her research on happiness, which resulted in two popular books, The Happiness Project (2009) and Happier at Home (2012), found that our inability to master unwanted behaviors was a major downer (令人沮丧的因素). So, after guiding millions of readers down the path of true contentedness, Rubin turned her investigative skills toward habits.

    Her most important find? Change is possible if we do some soul searching and identify how we respond to expectations. And, just about everybody falls into one of four personality categories: Questioners, Obligers, Rebels and Upholders.

    Rubin believes herself to be a classic Upholder, someone who forms habits relatively easily because she responds well to both other people's deadlines and her own. As to the other types, Questioners will only form a habit if it makes sense to them; Obligers work hard to meet other people's expectations but often let themselves down. And Rebels resent (反感) habits.

    "Think about the habit that you want to form and then think: "What's everything I could do to set myself up for success?" says Rubin. For example, if you want to exercise more and you're an Obliger, call your friend who lives across the street and meet at 6：30 every morning for a walk.

    One common pitfall (陷阱), says Rubin, especially when it comes to changing your diet, is lack of clarity (清楚). "You can't make a habit out of eating more healthfully, "she says. Instead, your habit should be something like: "I'm going to pack a lunch every day and bring it to work instead of eating out."

    As for exercise, Rubin recommends a strategy called pairing—coupling two activities, one that you need or want to do and one that you don't particularly want to do. Rubin, for example, only allows herself to read magazines while on fitness equipment at the gym.

    Six months after a Chinese scientist was widely condemned for helping to make the world's first gene­edited babies, he remains out of public view, and new information suggests that others may be interested in undertaking the same kind of work outside the United States.

    A clinic in the United Arab Emirates city of Dubai emailed scientist He Jiankui to seek training in gene editing, Stanford University bioethicist Dr. William Hurlbut said ahead of a speech Tuesday at the World Science Festival in New York.

    Hurlbut, whose advice He often sought, said He told him that scientists from multiple countries and families with inherited health problems had messaged support and interest in altering the genes of embryos(胚胎)to prevent or treat disease. Hurlbut gave The Associated Press the email the Dubai clinic sent to He in December but decided to hide the clinic's name.

    "It reveals what eagerness there is out there to use this technology" and the need "for some sort of practical governance" of it, Hurlbut said.

    Jennifer Doudna, a University of California, Berkeley, co­inventor of the CRISPR gene­editing tool that He used, said that she also has heard of others who want to edit embryos.

    "I think they're entirely credible," she said of such reports. Doudna, who was also a speaker at the New York festival, said the field needs to focus on setting specific principles for how and when such work should proceed.

    "The technology is frankly just not ready for clinical use in human embryos," although research should continue, she said. Doudna is paid by the Howard Hughes Medical Institute, which also supports AP's Health and Science Department.

    Scientists and policy leaders have been debating how to set international standards or controls since He claimed in November that he had altered the genes of twin girls at conception(怀孕)to try to help them resist possible future infection with the AIDS virus.

    Editing embryos is outlawed in many countries because it risks damaging other genes, and the DNA changes can be passed to future generations. Many scientists have condemned He's work, and attention has fallen on other scientists who knew or strongly suspected what He was doing.