Paying a higher price than usual for a ticket to see a film in 3D is the annoyance of many a cinema-goer's life.

    But there may be a benefit to doing so, as a study has found that 3D films exercise the brain and improve short-term functioning in a similar way to brain-training tests.

    The research found that people who watched a movie in 3D improved cognitive (认知) skills, compared to those who watched it in 2D.

    The research was led by neuroscientist(神经学家) Dr Patrick Fagan from Goldsmiths University in London. More than 100 people took part in the experiment, where participants watched Disney film Big Hero 6 in either standard format or RealD 3D.

    They also carried out a brain-training-style test before and after seeing a section from the film. The test covered memory, reaction times and cognitive function and the results were compared later.

    According to the research, which was carried out in partnership with science group Thrill Laboratory, participants experienced a 23 percent increase in cognitive processing, as well as an 11 percent increase in reaction times.

     Fagan said that the results showed enough of an improvement in brain function to suggest that 3D could play a part in improving brain power in the future.

    “These findings are more significant than you might think,” he said. “It is a fact that people are living longer and there is a noticeable decline in cognitive brain function in old age which can worsen future quality of life. There has never been a better time to look at ways to improve brain function. The initial results of this study show that 3D films may potentially play a role in slowing this decline.”

    A second part of the experiment involved those watching the film being fitted with headsets that scanned brain activity and this too showed heightened (加强的) activity when watching 3D. According to the results, participants were seven percent more engaged with what they were watching, adding to argument that 3D movies are more like watching real-life—something Professor Brendan Walker from Thrill Laboratory agreed with.

    “As Professor Brendan Walker's test concluded, 3D films are more attractive and heighten the senses — this, in turn, makes the brain run at quicker speeds,” Dr Fagan said.

    What would work be like if you had no boss?Imagine you could make all your own decisions and no one told you what to do.

    A Swedish software company,Crisp,decided to get rid of their CEO.First,they needed to find out what a CEO actually did.Then they shared those duties among staff and board members,which is exactly what they did.And the employees believes it's been a good change.An employee named Heinrik Kniberg says the company can now act faster,"If you want to get something done,you stand up and start driving that.Workers are also more active and satisfied."And any big decisions are made during the all-member meetings several times a year.

    So,if it's working well for Crisp,could this model become more widespread? Online retailer（零售商）Zappos tried out a similar plan but had unpleasant results.Almost a fifth of its staff decided to leave,and CEO Tony Hsieh admitted that "self-management is not for everyone".Mr Houston,founder of file-sharing service Drew Dropbox,says that total freedom doesn't always feel good,because you no longer know what you're supposed to do,what is important and you're bumping up against other people."

    Would you like to work somewhere with no boss?

    Feet help us walk, run, dance, and jump. The words feet and foot are also used in everyday speech.

    To be under someone's feet means to be troublesome. In other words, you are standing too close to someone and are getting in their way. Some adults criticize (批评) children for being under foot.

    Speaking of children, if someone says their home will soon have the pitter-patter of tiny feet, it means the family is expecting a baby!

    Now, people who are active do not let grass grow under their feet. They are never in one place for very long. People who can think and take action at the same time are said to be able to think on their feet.

    Some people appear to have it all. They have money, a good education, good looks, a great family and a large circle of friends. You could say they have the world at their feet. This means whatever they want seems to be there for them.

    People who have both feet firmly on the ground are realistic and practical. They are not dreamy. You might say such a person is well grounded. If you are a bad dancer, you might be described as having two left feet. To dance well, it is better to have a right foot and a left foot.

    Sam loves skiing. He thinks that it would be fun to own a ski resort (滑雪场) high in the mountains. But he knows nothing about running a business. So, he decides to get his feet wet. In other words, he wants to get used to a new situation.

    He joins an organization for resort owners and attends their meetings. He travels to ski areas all over the United States. This helps Sam get his foot in the door. Having a foot in the door is a starting point. This expression comes from people selling things door-to-door. They would block the door with their foot so people couldn't close the door on them.

    I began cycling in 2004 when I was a poor student. It was dangerous, sure, but cycling is the fastest, cheapest point-to-point form of transport in Melbourne. I own a car now, but that's just for transporting the baby or groceries.

    I hate driving. So it's been quite encouraging watching the growth in cyclist numbers over the past decade. It is estimated that 10,000-plus cyclists enter the CBD (Central Business District) each day, taking pressure off public transport. But as more people take to cycling as a mode of transport, the number of cyclists seriously injured or killed keeps climbing. And that is a sign that our infrastructure (基础设施) is still not good enough.

    Melbourne was once a dream for cyclists-flat, long, wide roads, with plenty of paths along rivers. Now, cycling can be deadly, with roads dominated by cars. I have a friend who broke her back and was lucky to escape paralysis, and others with broken bones. In my time riding, I've been forced off the road by a truck, cut off by four-wheel drives, and told to get off the road.

    These things don't exactly happen to trams and buses, those other slow coaches on Melbourne's roads. No—drivers reserve a particular savagery (残暴行为) for cyclists. And that's a sign of exactly one thing: inadequate infrastructure.

    We shouldn't need to be taught how to coexist in the same narrow space. Drivers and cyclists should be kept apart. The present debate over how to minimize “dooring” is a distraction.

    Dooring is not a legal problem. You cannot legislate (制定法律) it away. Designing bike paths so riders are channelled between moving cars and parked cars is deadly. All it takes is one daydreaming driver to fling open the door and you are gone. That's what happened to the young university student James Cross.

    This year, there are to be new anti-dooring lanes (车道) built on Glenferrie Road, Hawthorn, where Cross died in 2010. But these lanes are not safe. Cyclists must still pass between two rows of cars.

    We often ask these questions: Are African wild dogs really dogs? What's the difference between African wild dogs and the dogs we know as pets? For one thing, African wild dogs, which live in Africa, only have four toes, while domestic(驯养的）dogs and wolves have five. But you won't want to count for yourself, because they are truly wild animals.

    “Wild dogs are not somebody's domestic dogs that ran away and didn't come back, although some people used to think that,” explains Dr. MeNutt, who studies these animals at Wild Dog Research Camp in the African country of Botswana. “They are actually Africa's wolves, and just like wolves, and they do not make good pets. They need to be out in the wild doing what they are supposed to do — find the food they need to survive and feed their babies.” In fact, they travel so far that researchers have to use radio collars (颈圈) to keep track of them. The collars send out radio signals that tell people where the dogs are. No two wild dogs have the same pattern of coats, so it is easy to tell them apart.

    African wild dogs are smart and sociable, like pet dogs. Adult wild dogs, male and female, are willing to take good care of young ones.

    Millions of domestic dogs live on the planet, but there are probably fewer than 6000 African wild dogs left. Humans hunt them and farmers who don，t want them to go after cows and sheep poison them. Humans are also destroying the wild, natural habitat (栖息地) they need to survive in. Fortunately, today more farmers are finding other ways to protect their cows and sheep from African wild dogs instead of killing the animals.

    I'm sitting in my kitchen in London, trying to figure out a text message from my brother. He lives in our home country of Germany. We speak German to each other, a language that's rich in odd words, but I've never heard this one before: fremdschämen. I'm too proud to ask him what it means. I know that eventually, I'll get it. Still, it's slightly painful to realize that after years of living abroad, my mother tongue can sometimes feel foreign.

    Most long-term migrants know what it's like to be a slightly rusty(生疏的) native speaker. The process seems obvious: the longer you are away, the more your language suffers. But it's not quite so straightforward.

    In fact, the science of why, when and how we lose our own language is complex and often different to what we think. It turns out that how long you've been away doesn't always matter. Socializing with other native speakers abroad can worsen your own native skills. And emotional factors like trauma(精神创伤) can be the biggest factor of all.

    It's not just long-term migrants who are affected, but to some extent anyone who picks up a second language. The minute you start learning another language, the two systems start to compete with each other, says Monika Schmid, a linguist at the University of Essex.

    Schmid is a leading researcher of language attrition, a growing field of research that looks at what makes us lose our mother tongue. In children, the phenomenon is somewhat easier to explain since their brains are generally more flexible and adaptable. Until the age of about 12, a person's language skills are relatively easy to change. Studies on international adoptees have found that even nine-year-olds can almost completely forget their first language when they are removed from their country of birth.

    But in adults, the first language is unlikely to disappear entirely except in extreme circumstances. For example, Schmid analyzed the German of elderly German-Jewish wartime refugees(难民) in the UK and the US. The main factor that influenced their language skills wasn't how long they had been abroad or how old they were when they left. It was how much trauma they had experienced as victims. Those who left Germany in the early days of Nazi occupation, before the worst violence, tended to speak better German – despite having been abroad the longest. Those who left later, tended to speak German with difficulty or not at all.

    "It seemed very clearly a result of this trauma", says Schmid. "Even though German was the language of childhood, home and family, it was also the language of painful memories." The most traumatised refugees had held them back. As one of them said: I feel that Germany betrayed me. America is my country, and English is my language.