Some educators told us that more years of school could help students get higher scores on intelligence tests. That was a finding of a study of teenage males in some countries. Now, another research shows that physical activity may help students do better in their classes.

    The research comes as educators in some countries are reducing time for activities like physical education. They are using the time instead for academic（学术的）subjects like math and reading. The studies appeared between 2008 and 2014. They included more than 55, 000 children, aged 6 to 18.

    Amika Singh:“ According to the results of our study, we can conclude that being physically active is beneficial for academic performance. There are, first, Physiological explanations, like more blood flow, and so more oxygen to the brain. Being physically active means there are more hormones(荷尔蒙)produced like endorphins(内啡肽). And endorphins make your stress level lower and your mood improved, which means you also perform better.”

    Also, students taking part in organized sports learn rules and how to follow them. This could improve their classroom behavior and help them keep their mind on their work.

    The study leaves some questions unanswered, however. Ms. Stash says it is not possible to say whether the amount or kind of activity affected the level of academic improvement. This is because of differences among the studies.

    The researchers said they found only two high-quality studies. They needed more high-quality studies to confirm (证实) their findings. They also pointed out that “results for other parts of the world may be quite different.”

    Still，the general finding was that physically active kids are more likely to do better in school. Ms. Singh says schools should consider that finding before they cut physical education programs. Her paper on “Physical Activity and Performance at School” is published in the Archives of Pediatric and Adolescent Medicine.

How to Handle Being the New Kid at School

    Being the new kid at school can be a terrible experience! It might seem like everybody else knows exactly how to act. But remember you aren't alone. Actually, everybody is nervous on their first day and you can fit right in with the help of the following tips.

    Plan ahead the night before. {#blank#}1{#/blank#} Lay out your first day outfit (全套服装), pack a lunch, and make sure you have all your school supplies ready to go. Planning ahead can help you get a good night's sleep and feel less nervous about your first day.

    {#blank#}2{#/blank#} Make sure your clothes are cleaned and pressed and that you've showered, brushed your teeth. If you're hoping to attract friends with similar interests, try wearing a shirt with your favorite show, musician, or sports team on it. {#blank#}3{#/blank#}

    Do your best to stay calm and positive. It's normal to feel nervous or anxious when you're the new kid at school. If you feel nervous, start by taking some deep breaths. {#blank#}4{#/blank#} You can listen to music that makes you feel calm or happy. Try imagining a good first day in your mind instead of keeping thinking about things that could go wrong.

    {#blank#}5{#/blank#} Don't come in on the first day with your head hanging down, your shoulders lowered, and your eyes on the floor. Walk with your head held up, your back straight, and a bright expression on your face. Make eye contact with other people, and smile if they look at you or speak to you.

A. Use your body language to show confidence.

B. Introduce yourself to your teachers and classmates.

C. Choose clothes that make you feel great.

D. This can be an easy way to start a talk and break the ice a little.

E. You should keep talking and let people know that you are friendly.

F. Remember that everyone is the new kid at some point and that it's not a big deal.

G. You'll feel less worried if everything is ready before you wake up for your first day.

    In the fight to conserve tropical rainforests, here's a tool you don't often hear about orange peels. Specifically, 12,000 tons of them, dumped (倾倒) on the land. “You don't usually associate waste treatment with biodiversity benefits, something that's good for the environment.

    Tim Treuer is an ecologist at Princeton University, and he's talking about a unique conservation story. It started in the early 1990s, when an orange juice producer called Del Oro set up a company near the Guanacaste Conservation Area in Costa Rica, a region that contains several national parks and a wildlife protection zone.

    Del Oro needed somewhere to dump the orange peels, and the company also owned forested land next to the parkland that it had no intention of growing crops on. So a deal was struck: if Del Oro donated its forested land, it could dump orange peel waste on degraded(退化的) land within the conservation area. Then a thousand dump trucks' worth of orange peels were lying on the land in 1998. “And within about six months the orange peels had been turned from orange peels into this thick black rich soil.”

    “I couldn't even find the site the first time I saw it.” He couldn't find it because, over 16 years, the orange peel waste had sent the land on a journey to become a vine-choked jungle, with three times the diversity of tree species of the neighboring control plot, richer soil and a much thicker covering. In other words, the experiment was a success. The results appear in the journal Restoration Ecology.

    Treuer says perhaps this lesson could be applied elsewhere. “It's a shame that we live in a world with nutrient-limited degraded ecosystems and also nutrient-rich waste streams. We'd like to see those things come together a little bit. That's not license for any agricultural company to just start dumping their waste products on protected areas, but it does mean that land managers, people involved with industrial-scale agricultural operations should start thinking about ways to do thoughtful experimentation to see if in their particular system they can have similar win-win-win results.”

    How could we possibly think that keeping animals in cages in unnatural environments -mostly for entertainment purposes - is fair and respectful? Zoo officials say they are concerned about animals. However, most zoos remain “collections” of interesting “things” rather than protective habitats.

    Zoos teach people that it is acceptable to keep animals bored, lonely, and far from their natural homes. Zoos claim to educate people and save endangered species, but visitors leave zoos without having learned anything meaningful about the animals' natural behavior, intelligence, or beauty. Zoos keep animals in small spaces or cages, and most signs only mention the species' name, diet, and natural range.

    The animals' normal behavior is seldom noticed because zoos don't usually take care of the animals' natural needs. The animals are kept together in small spaces, with no privacy and little opportunity for mental and physical exercise. This results in unusually and self-destructive behavior called zoochosis. A worldwide study of zoos found that zoochosis is common among animals kept in small spaces or cages. Another study showed that elephants spend 22 percent of their time making repeated head movements or biting cage bars, and bears spend 30 percent of their time walking back and forth, a sign of unhappiness and pain.

    Furthermore, most animals in zoos are not endangered. Captive breeding(圈养繁殖) of endangered big cats, Asian elephants, and other species has not resulted in their being sent back to the wild. Zoos talk a lot about their captive breeding programs because they do not want people to worry about a species dying out. In fact, baby animals also attract a lot of paying customers. Haven't we seen enough competitions to name baby animals?

    Actually, we will save endangered species only if we save their habitats and put an end to the reasons people kill them. Instead of supporting zoos, we should support groups that work to protect animals' natural habitats.

    Can We Stop Food Longing Through Imaginary Eating?

    Are you fighting an urge to reach for chocolate? Then, let it melt in your mind, not in your mouth. According to the recent research, imagining eating a specific food reduces your interest in that food, so you eat less of it.

    This reaction to repeated exposure to food—being less interested in something because you've experienced it too much—is called habituation.{#blank#}1{#/blank#}

    The research is the first to show that habituation can occur through the power of the mind. "If you just think about the food itself—how it tastes and smells—that will increase your appetite," said Carey More wedge, a well-known psychologist. "It might be better to force yourself to repeatedly think about chewing and swallowing the food in order to reduce your longing.{#blank#}2{#/blank#}Visualizing yourself eating chocolate wouldn't prevent you from eating lots of cheese," he added.

    More wedge conducted an interesting experiment. 51 subjects were divided into three groups. One group was asked to imagine putting 30 coins into a laundry machine and then eating three chocolates.{#blank#}3{#/blank#}Another group was asked to imagine putting three coins into a laundry machine and then eating 30 chocolates. Lastly, a control group imagined just putting 33 coins into the machine—with no chocolates.{#blank#}4{#/blank#}When they said they had finished, these were taken away and weighed. The results showed the group that had imagined eating 30 chocolates each ate fewer of the chocolates than the other groups.

    {#blank#}5{#/blank#}Physical signals—that full stomach feeling—are only part of what tells us we've finished a meal. The research suggests that psychological effects, such as habituation, also influence how much a person eats. It may lead to new behavioral techniques for people looking to eat more healthily, or have control over other habits.

A. What's more, this only works with the specific food you've imagined.

B. People were advised to try different methods to perform the experiment.

C. For example, a tenth bite is desired less than the first bite, according to the study.

D. All of them then ate freely from bowls containing the same amount of chocolate each.

E. It meant those who repeatedly imagined eating would concern about some specific food.

F. This requires the same motor skills as eating small chocolates from a packet, the study says.

G. This study is part of the research looking into what makes us eat more than we actually need.

Thanksgiving Day is special holiday in the United States and Canada. Families and friends gather to eat and give thanks for their blessing.

Thanksgiving Day is really a harvest festival. This is why it is celebrated in late fall, after the crops are in. But one of the first thanksgivings in America had nothing to do with a good harvest. On December 4, 1619, the Pilgrims (清教徒) from England landed near what is now Charles City, Virginia. They knelt down and thanked God for their safe journey across the Atlantic.

The first New England Thanksgiving did celebrate a rich harvest. The Pilgrims landed at what is now Plymouth, Massachusetts, in 1620. They had a difficult time and the first winter was cruel. Many of the Pilgrims died. But the next year, they had a good harvest. So Governor Bradford declared a three­day feast. The Pilgrims invited Indian friends to join them for their special feast. Everyone brought food.

In time, other colonies (殖民地) began to celebrate a day of thanksgiving. But it took years before there was a national Thanksgiving Day. During the Civil War, Sarah Josepha Hale persuaded Abraham Lincoln to do something about it. He proclaimed (宣布) the last Thursday of November 1863 as a day of thanksgiving. Today, Americans celebrate this happy harvest festival on the fourth Thursday in November. Canadians celebrate Thanksgiving Day in much the same way as their American neighbours. But the Canadian Thanksgiving Day falls on the second Monday in October.