The Science of Risk-Seeking

    Sometimes We decide that a little unnecessary danger is worth it because when we weigh the risk and the reward, the risk seems worth tasking. {#blank#}1{#/blank#}Some of us enjoy activities that would surprise and scare the rest of us. Why? Experts say it may have to do with how our brains work.

    The reason why any of us take any risks at all might have to do with early humans. Risk-takers were better at hunting, fighting, or exploring. {#blank#}2{#/blank#}As the quality of Risk-taking was passed from on ration to the next, humans ended up with a sense of adventure and a tolerance for risk.

    So why aren't we all jumping out of airplanes then? Well, even 200,000 years ago, too much risk-taking could get one killed. A few daring survived, though, along with a few stay-in-the-cave types. As a result, humans developed a range of character types that still exists today. So maybe you love car racing, or maybe you hate it. {#blank#}3{#/blank#}

    No matter where you are on the risk-seeking range, scientists say that your willingness to take risks increases during your teenage years. {#blank#}4{#/blank#}To help you do that, your brain increases your hunger for new experiences. New experiences often mean taking some risks, so your brain raises your tolerance for risk as well.

    {#blank#}5{#/blank#},for the risk-seekers a part of the brain related to pleasure becomes active, while for the rest of us, a part of the brain related to fear becomes active.

    As experts continue to study the science of risk-seeking, we'll continue to hit the mountains, the waves or the shallow end of the pool.

    Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight:

    Schedule yearly exams. {#blank#}1{#/blank#}Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eye- glasses.

    Protect against UV rays . Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses. {#blank#}2{#/blank#}

    Give your eyes a break. Two-thirds of Americans spend up to seven hours a day using computers or other digital products. {#blank#}3{#/blank#}Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.

    {#blank#}4{#/blank#}As part of a healthy diet, eat more fruits and vegetables each day. Vitamins C and E help protect eyesight and promote eye health.

    Practice safe wear and care of contact lenses (隐形眼镜). Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk. {#blank#}5{#/blank#} Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.

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The changes facing fast-food companies

    Fast food was once thought to be recession-proof. When consumers need to cut spending, cheap meals like Big Macs and Whoppers become even more attractive. As a result, fast-food chains have survived the recession better than their more expensive competitors. In 2009 sales at full-service restaurants in America fell by more than 6%, but total sales remained about the same at fast-food chains. In some markets, such as Japan, France and Britain, total spending on fast food increased.

    But in this ongoing recession(萧条), which is more severe, not all fast-food companies have been as fortunate. Many, such as Burger King, have seen sales fall. In the recession, while some people trade down to fast food, many others eat at home more frequently to save money. Smaller fast-food chains in America, such as Jack in the Box and Carl's Jr., have been hit particularly hard in this downturn because they cut back spending on advertising.

    In face of such challenges, some fast-food companies have sacrificed their own profits by trying to give customers better value. During the recession companies set prices low, hoping to tempt more customers through the door. But in many cases that strategy doesn't work. Some companies are rethinking their strategies. KFC has launched a chicken sandwich that costs around $5 to attract consumers away from $1 specials.

    Companies are also trying to get customers to buy new and more items, including drinks. McDonald's started selling better coffee as a challenge to Starbucks. Its “McCafe” line now accounts for an estimated 6% of sales in America. As fast-food companies shift from “super size” to “more buys”, they need to keep customer traffic high throughout the day. Many see breakfast as a big opportunity, and not just for fatty food. McDonald's has started selling porridge in America, because the profits can be high.

    But what about those growing waistlines? So far, fast-food firms have cleverly avoided government regulation. By providing options like salads and low-calorie sandwiches, they have at least given the impression of doing something about helping to fight obesity(肥胖). These offerings don't necessarily lead to profit loss, as they can broaden the appeal of stores to groups of diners that include some people who don't want to eat a burger.

    But calls for tougher government regulation never wear down. This year Congress passed America's health-reform bill, which requires restaurant chains with 20 or more stores to put the calorie-content of items they serve to the menu. And the recent proposal by a county in California to ban McDonald's from including toys in its high-calorie “Happy Meals”, because law makers believe it attracts children to unhealthy food, suggests that fast-food companies will have to continue trying something new.

    The changes facing fast-food companies

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    Many people know that trash is a big problem on planet Earth. What many people don't know is that trash has become a problem in outer space too. {#blank#}1{#/blank#}

    Statistically, there are more than 22,000 pieces of junk in space around the earth. And these are just the items that we can see from the surface of the earth by telescopes or radars. {#blank#}2{#/blank#}

    Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to people, particularly astronauts. If the tiniest piece of junk crashed into a spacecraft, it could damage the vehicle. That's because the faster an object moves, the greater the impact if the object collides with something else.

    To help minimize additional space junk, countries around the world have agreed to limit the time their space tools stay in orbit to 25 years. Each tool must be built to fall safely into the earth's atmosphere, or the mass of gases that surround the earth, after that. {#blank#}3{#/blank#}

    Many scientists are also proposing different ways to clean up space junk. The Germans have been planning a space mission with robots that would collect pieces of space trash and bring them back to Earth so that they can be safely destroyed.

    "In our opinion the problem is very challenging, and it's quite urgent as well," said Marco Castronuovo, an Italian Space Agency researcher who is working to solve the problem. {#blank#}4{#/blank#} Many of these objects are tools that help people use their cell phones or computers.

    "The time to act is now; as we go farther in time we will need to remove more and more fragments," he says.

A. One reason that it's urgent is that countries are sending more and more objects into space.

B. There are also millions of smaller pieces of junk that we can't see.

C. Blowing up older satellites with a missile may create thousands of smaller pieces!

D. In the upper parts of the atmosphere, it will burn up.

E. When two objects in space collide, the two objects break into many smaller pieces.

F. Years of space exploration have left tons of "space junk" in orbit around the planet.

The urge to share our lives on social media

    People have long used media to see reflections of themselves. Long before mobile phones or even photography, diaries were kept as a way to understand oneself and the world in which one lives. In the 18th and 19th centuries, as diaries became more popular, middle-class New Englanders, particularly white women, wrote about their everyday lives and the world around them.

    These diaries were not a place into which they poured their innermost thoughts and desires, but rather a place to chronicle (记录) the social world around them. The diaries captured the everyday routines of mid-19th-century life, and women diarists in particular focused not on themselves but on their families and their communities.

Diaries today are, for the most part, private. But things were different for these New England diaries. Young women who were married would send their diaries home to their parents as a way of maintaining kin (血缘) relations. When family or friends came to visit, it was not uncommon to sit down and go through one's journal together.

    Diaries are not the only media that people have used to document lives and share them with others. We have long used media like photo albums, baby books and even slide shows as a means of creating traces (痕迹) of our lives. We do this to understand ourselves and to see trends in our behaviour. We create traces as part of our identity and part of our memory.

    Sharing everyday life events can strengthen social connection and intimacy (亲密感). For example, you take a picture of your child's first birthday. It is not only a developmental milestone: the photo also strengthen the identity of the family unit itself. The act of taking the photo and proudly sharing it further reaffirms (再次证实) one as a good and attentive parent. In other words, the media traces of others figure in our own identities.

    Today's social media platforms are, by and large, free to use, unlike historical diaries, which people had to buy. Today, advertising subsidises (补贴) our use of networked platforms. Therefore these platforms encourage use of their networks to build larger audiences and to better target them. Our pictures, our posts, and our likes are commodified—that is, they are used to create value through increasingly targeted advertising.

    Instead of social media merely connecting us, it has become a craze (狂热) for information, continually trying to draw us in with the promise of social connectivity—it's someone's birthday, someone liked your picture, etc. There's a multibillion-dollar industry pulling us into our smartphones, relying on a longstanding human need for communication.

    The urge to be present on social media is much more complex than simply narcissism (自恋).

    Social media of all kinds not only enable people to see their reflections, but to feel their connection as well.

    Today, in most of the theatres in Britain, the stages are situated behind a sort of arch (拱门), called the proscenium (幕布前的舞台部分)arch. The arch runs across the building with the stage on one side of it and the auditorium, housing the audience, on the other. The audience is kept to the area from which it can get a clear view of the stage. This type of theatre has been is use for three hundred years. {#blank#}1{#/blank#} The actor can ignore them until the end, when they applaud the performance. If an actor wants to speak to the audience he tends to step out of the picture, as it were—down to the edge of the stage.

    {#blank#}2{#/blank#} Stage furniture or properties—"props", as they are referred to in the business – are now as few as possible. Elaborate scenery is used only when it is going to last throughout the play, or when it is so constructed that it can be changed quickly. Modern theatres are built with the stage extending far in front of the proscenium arch, if indeed they have a proscenium arch at all, electricity, already long in use, has recently had a revolutionary effect. A change of lighting is as good as a change of scenery, and simpler and quicker; it can light one part of the stage in place of another. Footlights have been found unnecessary. Curtains also are hardly necessary, since the stage can be darkened to signify the end of a scene.

    The modern idea of having the stage in front of the proscenium arch is not really modern, of course. It makes our stages much like Shakespeare's. {#blank#}3{#/blank#} The famous speeches of Hamlet, for instance, can be delivered more quietly and naturally than they were in the las century. The actors no longer have to worry much about not being heard, or about turning their backs to the auditorium. They can get closer to the audience, while a larger audience can see them at work.

    Moreover, nowadays, people are finding that modern theatres are built to sit in comfortably for two or three hours at a stretch. {#blank#}4{#/blank#} The result of these improvements is that, in spite of the high price of seats, perhaps more people than ever before are keen on theatre-going.

A. Over the last few decades, since the Second World War, theatrical customs have altered.

B. It makes people feel, as they watch a play or a show, that they are seeing a living and moving picture.

C. All these innovations have quickened up the pace of the drama.

D. This is an advantage both for actors and audience.

E. Today the theatres are much more comfortable because of the many improvements.

F. Often they can meet and eat in the restaurants attached to the theatres.