Are you preparing for a big test? If so, you may want to go play some basketball in between hitting the books. Doctors are starting to find more and more information that suggests a connection between exercise and brain development. Judy Cameron, a scientist at Oregon Health and Science University, studies brain development. According to her research, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed. Dr. Cameron claims this allows people who exercise to concentrate better. As she says, “While we already know that exercise is good for the heart, exercise can really cause physical changes in the brain.”

    The effects of exercise on brain development can even be seen in babies. Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active. With babies, even a little movement can show big results. Margaret Barnes, a pediatrician（儿科医生）, believes in the importance of exercise. She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. “Babies need movement that stimulates their five senses. They need to establish a connection between motion and memory. In this way, as they get older, children will begin to associate physical activity with higher learning,” says Margaret.

    Older people can strengthen their brains as well. Columbia University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for babies, exercise for older people should involve some complexity. Learning some new skills or motions, such as with yoga or tai-chi, helps to open up memory paths in the brain that may not have been used for a long time.

    For most people, any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood. And your brain can benefit from as little as three to four hours of exercise a week.

    A couple from Miami, Bill and Simone Butler, spent sixty-six days in a life-raft in the seas of Central America after their boat sank.

    Twenty-one days after they left Panama in their boat, Simony, they met some whales. “They started to hit the side of the boat” said Bill, “and then suddenly we heard water.” Two minutes later, the boat was sinking. They jumped into the life-raft and watched the boat go under the water.

    For twenty days they had tins of food, biscuits and bottles of water. They also had a fishing-line and a machine to make salt water into drinking water—two things which saved their lives. They caught eight to ten fish a day and ate them raw（生的）. Then the line broke. “So we had no more fish until something very strange happened. Some sharks came to feed, and the fish under the raft were afraid and came to the surface. I caught them with my hands.”

    About twenty ships passed them, but no one saw them. After fifty days at sea their life-raft was beginning to break up. Then suddenly it was all over. A fishing boat saw them and picked them up. They couldn't stand up. So the captain carried them onto his boat and took them to Costa Rica. Their two months at sea was over.

    A serious problem for today's society is who should be responsible for our elderly and how to improve their lives. It is not only a financial problem but also a question of the system we want for our society. I would like to suggest several possible solutions to this problem.

    First, employers should take the responsibility for their retired employees. To make this possible, a percentage of profits should be set aside for this purpose. But when a company must take life-long responsibility for its employees, it may suffer from a commercial disadvantage due to higher employee costs.

    Another way of solving the problem is to return the responsibility to the individual. This means each person must save during his working years to pay for his years of retirement. This does not seem a very fair model since some people have enough trouble paying for their daily life without trying to earn extra to cover their retirement years. This means the government might have to step in to care for the poor.

    In addition, the government could take responsibility for the care of the elderly. This could be financed through government taxes to increase the level of pensions. Furthermore, some institutions should be created for senior citizens, which can help provide a comfortable life for them. Unfortunately, as the present situation in our country shows, this is not a truly viable answer. The government can seldom afford to care for the elderly, particularly when it is busy trying to care for the young.

    One further solution is that the government or social organizations establish some working places especially for the elderly where they are independent.

    To sum up, all these options have advantages and disadvantages. Therefore, it is reasonable to expect that some combination of these options may be needed to provide the care we hope to give to our elderly generations.

    Brazil, the largest country in South America, is famous for the Amazon rainforest and soccer. But on the hottest days, people travel there for another reason – the Carnival. Full of excitement and fun, the Carnival is held annually in February or March. This year, the celebration runs from March 2^nd to 9^th.

    It is a wild festival of food, music and dance. The word "Carnival" comes from the Portuguese "Carne Vale", which means "farewell to meat". In the early 1600s, the Portuguese brought European traditions to Brazil. Then they started their own carnival with dances and music, which were inspired by black people brought there by the slave trade.

    With its beautiful floats (花车), attractive clothes and happy people, the Samba Parade is the most fantastic event of the Carnival. The Sambadrome is a special stadium for the Carnival in Rio de Janeiro with 80,000 seats where people can sit and enjoy the festival. Samba is said to be the soul of Rio. "This is where the passion for samba lies – the atmosphere is electric as even the oldest men and women sing and dance to the music," travel guidebook Lonely Planet noted.

    Top samba schools stand out in the main parade, with fantastic parades of floats and thousands of dancers. The parade goes on until dawn. The schools base their performances on certain themes from Brazilian history or on social and environmental problems, such as that of the Amazon rainforest.

    Besides fun street parties, colorful costumes and energetic music, Carnival also offers plenty of tasty street food, such as Quindim – a dessert made of egg yolks and sugar.

Overall, it is traditionally a time to go a bit crazy with eating, dancing and dressing up.

    Over the centuries the French have lost a number of famous battles with the British. However, they've always felt superior in the kitchen. France has for centuries had a reputation for cooking excellence, and Britain for some of the worst cooking in the world. But according to a recent survey, that reputation may no longer reflect reality.

    In the survey, 71% of the Britons said they cook at home every day, while only 59% of the French said they cook daily. British home cooks spend more time cooking each week and also produce a greater variety of dishes than French home cooks.

    The reaction in London was predictably enthusiastic. British food has greatly improved since the 1990s. Once upon a time, the menu for many family meals would have been roast beef, potatoes and over-cooked vegetables, but not now. Home cooks are experimenting with the huge range of ingredients now available in British supermarkets and are preparing all kinds of new dishes, using the cookbooks that sell millions of copies every year. As a result, there's much more diversity in British food now, compared to French food, which tends to be very traditional.

    Some French people say that the survey did not show the whole picture. They agree that during the week French women don't cook as much as they used to because most of them work and don't have much time. They tend to buy ready-made or frozen dishes, but many of them make up for it on the weekend. There's also a difference between Paris and the countryside. It's true that people in Paris don't cook much, but elsewhere, cooking is still at the heart of daily life.

    For many French people, opinions about British food have not changed. When Bernard Blier, the food editor at a magazine, was asked about British food, he replied: "I don't go out of my way to try it. It is not very refined. You can say that I'm not a fan at all."

    Every morning, Ben Mumford starts his school day with math. At the age of ten, he is already working at GCSE level, but he does not always bother to get out of his pajamas (睡衣裤) in time for the class. He reads more books than most of his friends, studies science on the beach, and recently built a go-kart (卡丁车) in a technology lesson. Ben is happy and fulfilled, all, his mother believes, thanks to homeschooling.

    Homeschooling is not what it used to be. What emerged in the 1970s as a way for Catholic (信天主教的) parents to infuse (灌输) religion into their kids' education is now probably the fastest-growing form of education in the U.K. The number of homeschooled children has risen by about 40 percent over three years. Here are a handful of reasons why homeschooling makes sense in the 21^st century.

    Contrary to the name, homeschooling takes place in an actual home only a small part of time. A great deal of instruction happens in libraries, museums and community colleges. These experiences have the effect of helping kids mature much more quickly and developing a trait of open-mindedness.

    The key idea of homeschooling is that kids need to learn at the speed, and in the style, most appropriate for them. Without formal curriculum to guide their education, homeschoolers get the chance to explore a range of topics that might not be normally offered until high school or college. They can study psychology in the fourth grade, or finance in the eighth grade.

    The most common misunderstanding about homeschoolers is that they lack social skills. However, social media makes it convenient for homeschoolers of today to have just as much opportunity to make friends as kids studying in traditional schools. Meanwhile, they do not need to deal with the potential problems of being around kids in a school environment, including bullying, which might result in anxiety and depression.

    For most people, school is really good, and it works for them because they learn in the way that school teaches. However, there are so many different ways of learning and processing (处理) information and knowledge. It does not necessarily work for everyone.