Among all the fast growing science and technology, the research of human genes, or biological engineering as people call it, is drawing more and more attention now. Sometimes it is a hot topic discussed by people.

    The greatest thing that gene technology can do is to cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two killers. And to date, doctors have not found an effective way to cure them. But if the gene technology is applied, not only these two diseases can be cured completely, bringing happiness and more living days to the patients, but also the great amount of money people spend on curing their diseases can be saved, therefore it benefits the economy as well. In addition, human life span （寿命） can be prolonged.

    Gene technology can help people to give birth to more healthy and clever children. Some families, with the English imperial （皇家的） family being a good example, have hereditary diseases. This means their children will for sure have the family disease, which is a great trouble for these families. In the past, doctors could do nothing about hereditary diseases. But gene technology can solve this problem perfectly. The scientist just need to find the wrong gene and correct it, and a healthy child will be born.

    Some people are worrying that the gene research can be used to manufacture human beings in large quantities. In the past few years, scientists have succeeded in cloning a sheep, therefore these people predict that human babies would soon be cloned. But I believe cloned babies will not come out in large quantities, for most couples in the world can have babies in very normal way. Of course, the government must take care to control gene technology.

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    While your pet fish may appear to be unaware of your presence, chances are that it knows you extremely well and can probably even identify you from a crowd of human faces!

    To test if this was accurate, some scientists decided to study archerfish（喷水鱼）. These animals don't have a sophisticated（复杂的）brain that is necessary to recognize the slight differences between human facial features.

    They began by presenting four archerfish with images of two human faces. Initially, the fish spit at both. However, they soon learned spitting water at the one selected by the researchers earned them a food treat. After that, they focused primarily on that image. The researchers then took the experiment one step further by introducing 44 other human faces to the mix.

    To the researcher's astonishment, the trained archerfish were able to recall the learned image almost 81% of the time. And this accuracy improved to 86% when the researchers made the identification even harder, by replacing the colored photos with a set of black and white images and hiding the shape of the head.

    The results of the study suggest that though having tiny brains, archerfish may have developed high visual discrimination abilities. While it is contrary to the previous theory that a sophisticated brain is necessary to recognize human faces, the researchers believe they do not recognize faces by recalling complex facial information like gender and identity, but more likely by discriminating between detailed  patterns. Even so, the fact that these archerfish could “remember” those faces demonstrates that they have an impressive memory for details that lasts much longer than the originally-thought 3 seconds!

    This is not the first time researchers have realized how “smart” fish are. Previous studies have shown that fish can recognize those fish they have “socialized” with previously, and even recall complex three-dimensional maps of their surroundings.

    It's not easy being a teenager— nor is it easy being the parent of a teenager. You can make your child feel angry, hurt, or misunderstood by what you say without realizing it yourself. It is important to give your child the space he needs to grow while gently letting him know that you'll still be there for him when he needs you.

    Expect a lot from your child, just not everything. Except for health and safety problems, such as drug use or careless driving; consider everything else open to discussion. If your child is unwilling to discuss something, don't insist he tell you what's on his mind. The more you insist, the more likely that he'll clam up. Instead, let him attempt to solve things by himself. At the same time, remind him that you're always there for him if he seeks advice or help. Show respect for your teenager's privacy (隐私). Never read his mail or listen in on personal conversations.

    Teach your teenager that the family phone is for the whole family. If your child talks on the family's telephone for too long, tell him he can talk for 15 minutes, but then he must stay off the phone for at least an equal period of time. This not only frees up the line so that other family members can make and receive calls, but teaches your teenager moderation (节制). Or if you are open to the idea, allow your teenager his own phone that he pays for with his own pocket money or a part-time job.

    Healthy, convenient and increasingly popular over the past few years, sushi has become as common a dish in the UK as in India or China. It's a popular lunch-choice for city-workers all over the country and you're never far from a restaurant or supermarket selling the traditional Japanese dish. But it turns out sushi may not be as healthy a choice as we thought — leading biologists have warned that it is in fact harming both the environment and our health.

    The UK sushi market is worth £69 million a year, but because we're eating so much of it, the tuna (金枪鱼) population in the oceans is dwindling. According to Professor Daniel Pauly and Dr Dirk Zeller, the leaders of British Columbia, Bluefin and yellowfin tuna populations have reached dangerous levels.

    Bluefin tuna is often served in high-end, excellent sushi restaurants, while yellowfin is more common in high-street sushi bars and supermarkets. Increasing global need means tuna populations are being overfished. Most of the UK's sushi comes from the Indian Ocean, but according to Professor Pauly we now only have 2-3 percent of what we had 200 years ago.

    Professor Pauly and Dr Zeller believe it is our love of healthy tuna that's causing the problems in our oceans. The fish is popular not just for its taste but for its health benefits. But while sushi has earned popularity for being low in calories and high in nutrients (营养物), we may have overestimated (高估) its health value.

    In advance of a lecture at the Zoological Society of London lately, Professor Pauly said he believes most high-street restaurants serve sushi that contains plastic microbeads (塑料微珠). “Microbeads are poison pills which take in all the pollutants and they are eaten by little fish which are then eaten by tuna.”

    So what should we eat instead? Dr Zeller and Professor Pauly are asking the public to step away from sushi and eat more fish like anchovies (凤尾鱼) — less attractive, but better for your health and the environment.

    Outside, it's a cold winter's day. Inside a large shopping center, people are hanging around. But then, without warning, a pop song starts to play loudly. A teenager boy walks lazily to the center of the open space, and dances crazily to the music. He's joined by two of his friends, then some of the old people. Within the space of a few seconds, more than sixty people are dancing to the music - all in time and all in step. At first, onlookers are baffled, then they start smiling and clapping. They now know what they're seeing: a flash mob （快闪）.

    According to Wikipedia, the term "flash mob" was created by Bill Wasik, an editor at Harper's Magazine, in 2003. Within a year, the phrase had entered the Concise Oxford English Dictionary. Since then, hundreds - possibly thousands - of flash mobs have been carried out around the world, in almost every kind of public space imaginable!

    Each flash mob has its own style, but most flash mobs follow a similar formula （方案）. Often, the organizers search for willing participants using social media. Instructions and dance moves are given through email or video download. There are usually several rehearsals （排练） before the big day.

    While it's happening, a few lucky passers-by watch it live. Most people who watch it, however, will see it later online. Some of the most popular flash mobs on YouTube have been watched more than 10million times. A famous example is MP3Experiment Eight, a flash mob that took place in New York City in July 2011 with over 3,500 participants. This event differed from normal flash mobs in that much of it was completely silent - and there were no rehearsals.

    Flash mobs provide the participants, onlookers and online viewers with a lot of enjoyment and pleasure. For this reason alone, they're a modern, popular art form that should be celebrated.