Rescue officials in Poland are working quickly to clear one of the country's highways. The roadway is covered with a sticky brown material. It is blocking cars from both directions.

    What is causing the mess? Milk chocolate. The problems began early Wednesday, after a huge truck carrying many tons of liquid chocolate overturned. Chocolate spilled out. It spread across six driveways of Poland's A2 highway.

    The liquid chocolate solidified（凝固）as it cooled, causing even more difficulties. The accident happened near the western Polish town of Slupca. Bogdan Kowalski is with the fire fighters of Slupca. He told the Associated Press that “the cooling chocolate is worse than snow”.

    Videos published on social media showed rescuers and cleaners were trying to move the sticky brown mess with a bulldozer（推土机）.

    The private Polish broadcaster TVN24 reported that the driver of the truck was taken to a hospital with a broken arm. The accident happened in the morning when there was little traffic. Nobody else was harmed.

    The sticky situation became a hot topic on social media. Some people offered to help the clean-up workers by eating the chocolate themselves.

    Marlene Kukawa is a media officer for Slupea police. She told the New York Times that rescue workers needed to remove the truck from the highway first. “The cleanup”, she said at the time, “will take a few hours or more.” She added that accidents are rare in this part of the A2 highway. And, she told the New York Times, she is sure the area has never experienced something quite like a huge chocolate spill.

    The faces of the four U. S. presidents on Mount Rushmore will likely last for centuries. But at a newly opened exhibit in Japan, you can catch them only for about eight months. This year, the annual sand sculpture event at the Sand Museum in Tottori, Japan, is focused on another country. This is the 10^th anniversary of the event. Artists came from 19 countries to shape sand into different sculptures that represent events in U. S. history and American landmarks.

    Tottori is a remote city in western Japan. In the past, not many tourists traveled to it. To attract more visitors, Tottori officials decided to use a natural resource: sand. They decided to create a sand museum that would house a series of sand sculptures based on different geographic areas of the world. The sand from each year's exhibition is used again the next year. The project has been a success. About 500,000 people visit the museum during the eight months. Some return year after year to see the new sculptures.

    The city is now a popular spot for sand sculpture artists too. Sculptors from around the world come to Tottori each spring, spending a few weeks working on their masterpieces. They use special tools to smooth the sandy surfaces, cut angles and details. They use only sand and water to create the huge sculptures, some of which tower over their creators.

    Originally, the artists built their creations outside. But the works lasted less than two months outdoors. So the museum built a permanent structure 10 house the artworks, which extended their life to eight months. Now many more tourists get to see the sculptures. Still, the fact that this art is not permanent is part of the appeal. The temporary sculptures reflect the Japanese value of appreciating the fleeting（稍纵即逝）nature of the world.

    Tottori is not the only Japanese town that shows temporary art like this. Sapporo, in northern Japan, hosts a similar exhibit in the winter, using snow instead of sand. Thai will be just about the time that the U. S. sand sculpture exhibition is taken apart, and the sand is saved for next year's show.

    Not all think laughter is the best medicine, but it seems to help. So scientists carried on a new study of diabetes (糖尿病) patients who were given a good dose of humor for a year to prove it.

    Researchers divided 20 high­risk diabetic patients into two groups. Both groups were given standard diabetes medicine. Group L viewed 30 minutes of humor of their choice, while Group C. the control group. did not. This went on for a year of treatments.

    By two months into the study. the patients in the laughter group had lower level of the hormones epinephrine (肾上腺素), considered to cause stress. which is known to be deadly. After the 12 months. HDL cholesterol rises 26 percent in Group L but only 3 percent in Group C. In another measure. C­reactive proteins, a maker of heart disease. drop 66 percent in the laughter group but only 26 percent in the control group.

    “The best doctors believe that there is a physical good brought about by the positive emotion, happy laughter. ”said study leader Lee Berk of Loma Linda University. And other research has found that humor makes us more hopeful. Still, more study is needed, Berk said. The research by Berk found that humor can bring about similar changes in body chemistry. which was proved in the new study. The research result will be presented this month at the meeting in the US. Research at the University of Maryland School of Medicine shows that laughter causes the inner lining of blood vessels to expand. increasing blood flow in a way thought to be healthy.

    “Lifestyle choices have an important effect on health and these are choices which we and patients should pay attention to. rather than prevention and treatment,”Berk said in a statement this week.

    Coming to the end of my assistantship in Barcelona, I start to think about what the future might hold.

    It's been seven months and a few days since I arrived here and things have changed so much in what some might call a short period of time. When I first arrived in Terrassa I was excited and nervous to start a new adventure in a country I love. The first few days seem so long ago now, trying to find a place to live, organizing my timetable with the schools, meeting new people.

    However, a fortnight later, the excitement started to fade and I began to spend more than a few nights thinking about family and friends back home, wondering if I should be there with them. Everything started to change after meeting some new friends and spending good time with them, eating together and seeing new places as a group. I suppose we should never forget how important it is to have good people in your life, because they can make a difference.

    Coming back to Terrassa after visiting home for Christmas felt like returning to a second home, to a place that was mine with people I cared about. Things got even busier and more people came into my life; new friends, romance and a whole lot of good food flowed by in what seems to have been weeks, not months.

    Now, looking forward, there are some decisions to make. Should I return home to Scotland and move on with life there or try to extend my time here, perhaps make it something permanent? Experiencing other cultures or learning about the world is such an important thing to do if you have the means.

    My advice from my experience so far is to travel and try new things whenever you get the opportunity. You may find somewhere you were always supposed to be.

    Cooperation at work is generally considered a good thing. The latest survey by the Financial Times of what employers need from MBA graduates found that the ability to cope with a wide variety of people was what managers have wanted most. However, managers always find ways to balance the benefits of teamwork, which helps ensure that everyone is working towards the same goal. With the dangers of "groupthink", critics are reluctant to point out a plan's drawbacks for fear of being excluded by the group. The disastrous Bay of Pigs Invasion of Cuba in 1961 was a classic case of groupthink. Skeptics were unwilling to challenge John F. Kennedy, the newly elected American president.

    Modern communication methods prove that cooperation is more frequent. Workers are constantly in touch with each other via e-mail messaging groups or mobile calls. However, does that develop, or lower performance? A new study by three American academics, tried to answer this question They set a logical problem (designing the shortest route for a travelling salesman visiting various cities) Three groups were involved: one where subjects acted independently; another where they saw the solutions posted by team members at every stage; and a third where they were kept informed of each other's views only intermittently.

    The survey found that members of the: individualist group reached the: premier solution more often than the constant cooperators but had a poorer average result The intermittent cooperators found the right result, as often as the individualists, and got a better average, solution. When it comes: to: perfect generation, giving: people a, bit of space to, a solution seems to be a great idea. Occasional cooperation can be quite beneficial: most people have benefited from a colleague's brainwave or (just as often)wise advice to avoid a, particular course of action.

    Further clues come from a book, Superminds, by Thomas, Malone of the Massachusetts Institute of Technology. He says that three factors determine the collective intelligence of cooperating groups: social intelligence (how good people were at rating the emotional states of others); the extent to which members took part equally in conversation (the more equal, the better) and the cooperation of women in the group(the higher, the better Groups ranked highly in these areas cooperated far better than others did).

    In short, cooperation may be a helpful tool but it does not work in every situation.

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