“Our aim is to take our art to the world and make people understand what it is to move,” said David Belle, the founder of parkour(跑酷).

    Do you love running? It is a good exercise, yet many people find it boring. But what if making your morning jog a creative one? Like jumping from walls and over gaps, and ground rolls? Just like the James Bond in the movie Casino Royale? Bond jumps down from a roof to a windowsill and then runs several blocks over obstacles on the way. It is just because of Bond's wonderful performances that the sport has become popular worldwide.

    Yes, that's parkour, an extreme street sport aimed at moving from one point to another as quickly as possible, getting over all the obstacles in the path using only the abilities of the human body. Parkour is considered an extreme sport. As its participants(参与者) dash around a city, they may jump over fences, run up walls and even move from roof top to roof top.

    Parkour can be just as exciting and charming as it sounds, but its participants see parkour much more than that.

    Overcoming all the obstacles on the course and in life is part of the philosophy(理念) behind parkour. This is the same as life. You must determine your destination, go straight, jump over all the barriers as if in parkour and never fall back from them in your life to reach the destination successfully. A parkour lover said, “I love parkour because its philosophy has become my life, my way to do everything.”

    Another philosophy we've learnt from parkour is freedom. It can be done by anyone, at any time, anywhere in the world. It is a kind of expression of trust in yourself. It is only a state of mind. It is when you trust yourself that you earn energy.

    The tough economy is bringing new shoppers to the secondhand market.Plato's Closet in Charlotte,NC is a private company,which mainly buys and sells used clothes.While Charlotte has outstanding secondhand stores offering high-end and graceful brands for women,most of their stock applies to adults.Plato's closet targets teens and those in their 20s.

    Plato's Closet,with stores in Matthews and the university area,sells clothes and accessories（装饰品）that are currently popular at about one third the retail（零售）prices.

    The two hottest brands,for buying and selling,are Hollister and Abercrombie & Fitch.Even though the offerings tend to be suitable for young people,there are a variety of shoppers at Plato's Closet of varying ages.Women in their 30s,40s,and older could easily find a purse,jacket or piece of jewelry they like.

    If you are selling

    Unlike higher-end resale stores which usually work on consignment（寄售）,Plato's Closet buys on the spot.

    Items can be gently used,but must be in very good condition.

    Clothes should be less than two years old and styles should be the same as those still being sold at the shopping center.

    There is no negotiation;prices are set company-wide.If what you sell amounts to $30 or less,they'll give you cash.More than that,you'll get a Visa cash card.

    Secondhand success

    Don't get discouraged if you can't find something on your first trip.Resale shops are always getting new lists of goods and change their styles with each season.

    Be sure to check each piece carefully before buying.

    Price comparison

    Jackets: New York & Company black blazer,$12; retail: $37.

    Pants: Express Editor-style pants,$12; retail: $69.90.

    Shoes: Nine West black peep-toe pumps,$12; retail: $89.

    Jewelry: Necklaces,$3-$5; retail: $18-$30.

M: Remember Paul from our old school?

W: {#blank#}1{#/blank#}

M: I met him at the checkout in the supermarket the other day, and he was queuing right in front of me.

W: {#blank#}2{#/blank#}

M: Well, he started out as a manager in charge of sales. {#blank#}3{#/blank#} He teaches commercial English there.

W: Why did he get this new job? {#blank#}4{#/blank#}

M: Yes. It is tiring, though. After all, he has got a family to take care of.

W: I see. {#blank#}5{#/blank#}

M: Exactly!

A. Isn't he working in a company as a sales manager?

B. Then he transferred to work for an international giant.

C. Of course I do.

D. But he ended up getting a job at the local university.

E. Isn't it interesting to travel around as a sales manager?

F. That's a good point.

G. Sometimes it is a painful choice, career or family.

    People all need friends because nobody wants to be lonely and a friend can help you in good and bad times. You have made friends since childhood, but you still don't know who your true friends are. Here are some signs to tell you if your friend is a true friend:

Always honest

    Honesty is important to keep a relationship alive. A true friend always tells you the truth. It may be hard sometimes but lying can destroy a friendship. It is important that your friend speaks honestly and never makes up stories.

    There are always periods in your life when you have problems or difficulties. A true friend will always have time to listen to your problems and give advice. It may not be able to offer a solution to your problems but the fact that your friend made time to listen is a sign he/she cares for you. Your friend is not a true friend if he/she can never make time for you when you are in trouble. You also need to be reasonable and accept that your friend also has other things to do so he/she can't always listen immediately to your problems.

Always respectful (尊敬的)

    A true friend will always respect your opinion no matter whether he/she agrees or not. Your true friend may disagree but never insists that he/she is correct.

Always understanding

    It is possible that some problems will arise between you and your friend. A true friend will always be forgiving (体谅的) and understanding even if it isn't his/her fault. We are all different people and we all make mistakes. A true friend is always forgiving and understanding because he/she doesn't want to take the risk of losing his/her best friend.

Biologists from the John Innes Centre in England discovered that plants have a biological process which divides their amount of stored energy by the length of the night. This solves the problem of how to portion out (分配) energy reserves during the night so that the plant can keep growing, yet not risk burning off all its stored energy.

While the sun shines, plants perform photosynthesis (光合作用). In this process, the plants change sunlight, water and carbon dioxide into stored energy in the form of long chains of sugar, called starch (淀粉). At night, the plants burn this stored starch to fuel continued growth.

"The calculations are precise so that plants prevent starvation but also make the most efficient use of their food," said study co-author Alison Smith. "If the starch store is used too fast, plants will starve and stop growing during the night. If the store is used too slowly, some of it will be wasted. "

The scientists studied the plant Arabidopsis, which is regarded as a model plant for experiments. To give the plants some math tests, the biologists let night arrive unexpectedly early or late for them.

During one of the exams, they shut off the lights early on them that had been grown with twelve-hour days and nights. Putting them into darkness after only an eight-hour day means they didn't have time to store as much starch as usual. And this forced the plants to adjust their normal nightly rhythm.

Amazingly, even after this day length trick, the plants did very well in their exams and ended up with just five percent of starch left over at the end of the night. They had neither starved, nor stored starch that could have been used to fuel more growth.

The authors suggested that similar biological calculators may explain how a migratory bird, the little stint, can make a five-thousand-kilometer journey to their summer habitat in the Arctic and arrive with enough fat reserves to survive only approximately half a day more, on average.

The results of the study were published in e Life.

Spending all day glued to your smartphone probably isn't doing you any favors. Too much phone use has been linked with a range of concems, including sleep issues, joint pain and even relationship problems. But if it's radiation you're worried about, experts say you don't have to ditch your phone. 

"There's no risk of anything hazardous or dangerous with radiation from cellphones, "said Gayle Woloschak, an associate dean and professor of radiology at the Northwesterm Univerity Feinberg School of Medicine. As with all cellphones, along with Wi-Fi networks, radio stations, remote controls and GPS, smartphones do send out radiation, said Emily Caffrey, an assistant professor of health physics at the University of Alabama at Birningham. They use invisible energy waves to transmit voices, texts, photos and emails to nearby cell towers, which can carry them to almost anywhere in the world. But nearly three decades of scientific research has not linked such exposures to medical issues like cancer, health authorities including the Food and Drug Administration say. Here's what we know. 

"Radiation"describes many types of energy, some of which do carry risks, explained Dr. Howard Fine, director of the Brain Tumor Center at NewYork —Presbyterian Weill Cornell Medical Center in New York City, "It is often sent out from radioactive substances", Atomic bombs, or, to a far lesser degree, X-ray machines, send out energy called ionizing radiation that in high enough or frequent enough amount can damage DNA and cause cancer, Dr. Fine said. 

But smartphone energy falls into a category called non-ionizing radiation, Dr. Caffrey said, which isn't powerful enough to cause this damage. "A lot of people think‘radiation is radiation, 'but it's not all the same, "Dr. Woloschak said. "There's no DNA damage seen from cellphone use. "

Most experts and health authorities like the F. D. A. and World Health Organization agree that there's no evidence that smartphone radiation causes health problems. Still, several studies over the years have made headlines for suggesting their links to brain diseases. Many of these studies have since been proved to be false, Dr. Fine said, including those focused on fifth-generation.