Your New Year's plan to move more is one of the toughest to stick to, and a group of scientists working with obese(过度肥胖的) mice think they're starting to understand why

    Rather than our sedentary(久坐的) lives causing weight gain, says Alexxai Kraviz, the National Institutes of Health neuroscientist who led the study, changes in brain chemistry after we start gaining weight affect our capacity to move.

    “Obses mice can move just fine,” says Kravitz, who published the work with his team in Cell Metabolism “They just don't.”

    What Kravitz's team found is that the activity of a particular dopamine(多巴胺) receptor linked to movement goes down as mice gain weight on a high-fat diet. So the nice slow down and they move less. And when the researchers restored the activity of that dopamine receptor—DR2—the mice started moving more, even though they were still obese. The team also saw that lean mice missing the DR2 receptor acted like obese mice. This is the target, says Kravitz—restoring that dopamine receptor function. “Maybe 20 or 30 years down the road, we could do that in people,” he says.

    And there is one more thing: The scientists fed normal mice and the mice lacking DR2 the same high-fat diet. Both sets of mice gained weight at the same rate.

    Kravitz says this is important because mice lacking DR2 move less from the get-go, whereas a normal mouse takes a little time to start seeing that dopamine receptor-related loss of exercise. The ability to exercise seems to be disconnected from weight gain, he says.

    “Exercise is a healthy thing to do, but its impact on weight loss has been exaggerated,” he says. “We have to be realistic about the size of the effect of exercise on weight, as opposed to health benefits.”

    Still, before you abandon your New Year's exercise plan, keep in mind that this study was done using a high-fat diet, and not the normal calorie restriction that people maintain when they diet.

    That's a big drawback to the work, says Vicki Vieira-Potter, a University of Missouri physiologist not involved in the study.

    “They feed the mice with high-fat diet, it damages the receptor, and that decreases activity. Those who plan to lost weight should remember high-fat diet is a nice way to cause obesity in the lab, but it's not the same as the normal situation of obesity,” she says.

    Sine also says that a lot of the weight gain in the mice came after they stopped moving around, which indicates that the loss of movement did impact obesity.

    In France, franglais（英式法语）was seen as a national threat. Just as we took in thousands of French words in the Middle Ages, French speakers and writers today are taking in thousands of English and American expressions. By 1994, so many English words had made their way to French that the French government passed a law forbidding the use of English words where good French words existed.

    But the latest edition of the Academy francaise dictionary did admit about 6,000 new words to the French language, including, for the first time, a number of franglais words and expressions.

    However, this sort of thing is not just limited to traditional English – French Competition. Norway and Brazil have recently taken similar measures to keep English out.

    As English spreads around the globe, it has developed rich varieties. English has been spoken in Singapore since the early 19^th century, but after independence from Britain, Singapore went a step further and English was made the official language of business and government. But the day −to–day English that the people of Singapore actually speak is a far cry from the official English that the government wants them to learn. It has become an expressive dialect called “Singlish”, full of vocabulary and grammar borrowed from the Singapores' native languages.

    And this may be the irony（讽刺）of the global spread of English. The more widely it's spoken, the more it may change into local dialects, which are not easily intelligible. People will make English their own and, in doing so, will make it something else. This has happened before to Latin which broke into French, Italian, Spanish, Portuguese, and Romanian. But English has always welcomed variety and change, and it still does.

    There are some strange driving laws in different countries.

    Do you have a spare room in your house? What about a driveway for your car? Both of these can help you make money. Many people who are feeling the pinch are taking advantage of what's been called the “sharing economy”.

Perhaps the best-known example of a company in this field is Airbnb—an American web business which allows you to rent out your spare room to holidaymakers. It says it operates in 34,000 cities and it has over 1,500,000 listings.It seems to have concerned the market!

A British company is doing something with parking spaces. JustPark's founder, Anthony Eskinazi, says,“When I had the original idea, Ispotted a driveway close to a sports stadium. It would have been so convenient if I could have just parked in that driveway rather than in commercial car park.” And he has a big clientele（客户）:around 20,000 people have advertised their spaces on the site, and he says around half a million drivers use it. There are other sites doing very similar things, like Uber and Lyft—these let drivers share their cars with other passengers. Any driver knows how valuable a place to park is .A church near Kings Cross in central London has apparently made over £200,000 by renting out space in its yard to travelers!

    Because this is a new business world, those rules aren't there yet and many people are happy to share...as long as it pays!

    But the sharing economy has its critics: the competitors of these new companies. People who run things like traditional B&B, commercial car parks and taxi services are afraid of ending up out of pocket. And there is another issue: regulations on these new business are unclear. How will renting out your driveway affect your neighbor?

    The idea behind Facebook is to make us feel connected all the time. But in my research, I've found that the truth is quiet different.

    Technology, it turns out, has made being alone seem like a problem that needs soling. When young people are alone, even for a minute or two, they feel the need to connect to get on Facebook or some other social networks and chat. But in connecting, they often end up feeling more isolated. Why? Because by being in constant (不断的) connection, they lose the ability to feel satisfied with their own company (独处).

    Facebook can help us keep in touch with our friends, but we too often use it instead of spending face to face time with them. And since we feel the need to keep up with them online, we don't have moments of loneliness where we can collect our thoughts and learn how to be comfortable being alone.

——Sherry Turkle, Profescer

    Facebook connects more of us to more of our friends and family in more places than we have ever been connected before. Yes. Facebook is a huge time sink -maybe the biggest ever. Many people post useless stuff. And seeing too much of your friends lives can make you jealous (嫉妒的), but it won't make you lonely.

    Jane, a former student of mine, who is back in New York after living abroad for ten years told me that Facebook helps her a lot. The first time she moved back to New York from abroad, she felt disconnected from her family and friends. now because of lots of photos and information updates (更新), she knows what is happening with her friends all the time.

    In fact, if you are lonely in real life, you will be lonely online as well.

——Sree Steniveasan, Chief Digital office

Kids are begging parents for cell phones at younger and younger ages, leaving families with tough choices to make. It might take some time to teach kids how to use phones as tools, not toys. Here are a few ways to get the message across.

Tell them not to use phones at school. Phones can be a distraction (干扰) from learning when used in the classroom. {#blank#}1{#/blank#} In fact, 43% of teens admit that they often or sometimes use their phones as a way to avoid face-to-face communication with others.

Encourage them to contact long-distance relatives. {#blank#}2{#/blank#} They're also for keeping in touch with people who you may not get to talk to as often. If you have families who live in another city or state, ask your kids to strike up (发起谈话) a conversation.

Lead by example. Setting an example is not only about how you use your phone, but also about how much you use it. When you feel bored and expect to glance over social media, fight it by taking a short walk. {#blank#}3{#/blank#}

Advise them not to use phones at the dinner table. For many families, the only time they truly get together is breaking bread at the end of a long day. {#blank#}4{#/blank#} Asking your children to leave their phones far from the dinner table is a great way to solve the problem.

{#blank#}5{#/blank#} Sometimes, kids need a little push in order to make better choices about their phones. If they're struggling with healthy habits, put some real-world events on the calendar. Good options include going to an amusement park, working together on a craft project or signing your kids up for sports.

A. Plan other forms of entertainment.

B. Prepare a dinner together with your children.

C. Screen time before bed reduces sleep quality.

D. They can also prevent students from connecting with one another.

E. So it is wise of parents to stress the importance of parent-child time.

F. Also, instead of reading a headline, why not pull out a book to read?

G. Phones aren't just for texting the best friend who lives two blocks away.