2 . The benefits of regular exercise are well documented but there’s a new bonus to add to the ever-growing list. New researchers found that middle-aged women who were physically fit could be nearly 90 percent less likely to develop dementia in later life, and as they did, it came on a decade later than less sporty women.

Lead researcher Dr. Helena Horder, of the University of Gothenburg in Sweden, said : "These findings are exciting because it’s possible that improving people's cardiovascular （心血管的）fitness in middle age could delay or even prevent them from developing dementia. "

For the study, 191 women with an average age of 50 took a bicycle exercise test until they were exhausted to measure their peak （最大值的） cardiovascular capacity. The average peak workload was measured at 103 watts.

A total of 40 women met the criteria for a high fitness level, or 120 watts or higher. A total of 92 women were in the medium fitness category; and 59 women were in the low fitness category, defined as a peak workload of 80 watts or less, or having their exercise tests stopped because of high blood pressure, chest pain or other cardiovascular problems.

These women were then tested for dementia six times over the following four decades. During that time, 44 of the women developed dementia. Five percent of the highly fit women developed dementia, compared to 25 percent of the women with medium fitness and 32 percent of the women with low fitness.

"However, this study does not show cause and effect between cardiovascular fitness and dementia, it only shows an association. More research is needed to see if improved fitness could have a positive effect on the risk of dementia and also to look at when during a lifetime a high fitness level is most important. " She also admitted that a relatively small number of women were studied, all of whom were form Sweden, so the results might not be applicable to other groups.

3 . The United States rose to global power on the strength of its technology, and the lifeblood that technology has long been electricity. By providing long-distance communication and energy, electricity created the modern world. Yet properly understood, the age of electricity is merely the second stage in the age of steam, which began a century earlier.

"It is curious that no one has put together a history of both the steam and electric revolutions." writes Maury Klein in his book The Power Makers, Steam, Electricity, and the Men Invented Modern America. Klein, a noted historian of technology, spins a narrative so lively that at times it reads like a novel.

The story begins in the last years of the 18th century in Scotland, where Watt perfected "the machine that changed the world". Klein writes, "America did not invent the steam engine, but once they grasped its passwords they put it to more uses than anyone else. "

Meanwhile, over the course of 19th century, electricity went from mere curiosity to a basic necessity. Morse invented a code for sending messages over an electromagnetic circuit. Bell then gave the telegraph a voice. Edison perfected an incandescent bulls that brought electric light into the American home.

Most importantly, Edison realized that success depended on mass electrification, which he showed in New York City. With help from Tesla, Westinghouse's firm developed a system using alternating current, which soon became the major forms of power delivery.

To frame his story, Klein creates the character of Ned, a fictional witness to the progress brought about by the steams and electric revolutions in America during one man's lifetime. It's a technique that helps turn a long narrative into an interesting one.

4 . Art is everywhere. Any public space has been carefully designed by an artistic mind to be both functional and beautiful. Why, then, is art still so widely considered to be "the easy subject" at school, insignificant to wider society, a waste of time and effort?

Art can connect culture with commercial products in a way that not many other things can; art generates money and holds significant emotional and cultural value within communities. When people attend a concert, they are paying for music, sure, maybe even hotel rooms, meals, and transport, but they also gain an incredible experience, a unique atmosphere and a memory that will go through the rest of their lives. People don't just want material things anymore, they want to experience life一the arts are a perfect crossover（交迭）between culture and commerce.

Furthermore, the arts can bring communities together, reducing loneliness and making people feel safer. Social bonds are created among individuals when they share their arts experiences through reflection and discussion, and their expression of common values through artworks in honour of events significant to a nation's experience.

The arts clearly have a pretty positive impact on physical and psychological health. It is found that people who frequent cultural places or participate in artistic events are more likely to gain good health compared to those who do not; more engagement with the arts is linked to a higher level of people's wellbeing. The Royal Society of Public Health discovered that music and art, when used in hospitals, help to improve the conditions of patients by reducing stress, anxiety and blood pressure.

Children who are involved with the arts make greater achievements in their education: those engaged with drama have greater literary ability while others taking part in musical practice exhibit greater skills in math and languages. Kids with preference for the arts have a greater chance of finding employment in the future. Participating in the arts is essential for child development; encouraging children to express themselves in constructive ways could help to form healthy emotional responses in later life.

Vital to human life, art is celebrated and used by nations across the world for various purposes. Life without art would be boring and dead still, for art is a part of what makes us human.

Recent research suggests that if an argument gets resolved，the emotional response tied to it is significantly reduced or almost completely erased．Thus，it may be worth bringing up issues with your friends， family members，or classmates rather than holding them back．

There is a difference between arguing and fighting．Arguing is that you and your opponent present your concerns and discuss the feelings and issues related to those concerns．You can engage in an argument respectfully without stirring up（激起） anger．Fighting，however，usually involves personal attacks，raising of voices， and storming out．Discussing your issues and resolving them instead of stuffing them down can improve your emotional health．In a study，2.000 people were asked to record their feelings and experiences for eight days in a row．When people had an argument that they considered resolved， they had half the reactivity （情绪反应） of those who avoided an argument．Reactivity is an increase in negative emotions or a decrease in positive emotions．In other words，resolving an argument cuts your negative feelings by half．One day later， people who had a resolved argument reported no increase of negative emotions compared with those who avoided an argument． This means that resolving an argument can feel like you have reached a state of resolution——and you are less likely to be annoyed．

Moreover，the older you are，the more likely you will come to a resolution after an argument．This may be because more life experience usually leads to more defined priorities．You are more likely to distinguish between what matters and what does not．

It is easier to avoid a discussion，but risking talking about it may eventually lead to a better outcome．

6 . You’ve got mail…and it’s a postcard

Paulo Magalhaes, a 34-year-old Portuguese computer engineer, loves to open his mailbox and find a brightly colored picture of Rome’s Colosseum. Or Africa’s Victoria Falls. Or China’s Great Wall.     1    

“I often send postcards to family and friends.” he says to China Daily, “but you can imagine that after a while, you never receive as many as you send, and you realize that not everyone is into it.     2    ” Seeking other like-minded souls, however, Paulo started looking in a somewhat unlikely place: online. Many would say the Internet is a place for people who have given up on the traditional postal service, but Paulo’s hunch(直觉)paid off.

Today his hobby has developed into the website postcrossing.com, a social network that has grown to 575,217 registered users in 214 countries and regions since he started it 10 years ago.     3    Running the website has almost turned into a full-time job.

Language is certainly a barrier for many people. For postcrossing to work worldwide, a common communication language is needed so that everyone can understand each other. As cool as it may be to receive a postcard written in Chinese, the concept doesn’t work if one doesn’t understand it.     4     So a common language is required and in postcrossing that’s English since it’s widely spoken.

“Many people in China have limited exposure to English.     5     That said, we know of many postcrossing members, including Chinese, who have actually improved their English skills through their use of postcrossing,” Paulo says.

7 . The Biggest Stadiums in the World

People have been pouring into stadiums since the days of ancient Greece. In around 80 A.D., the Romans built the Colosseum, which remains the world’s best known stadium and continues to inform contemporary design. Rome’s Colosseum was 157 feet tall and had 80 entrances, seating 50,000 people. However, that was small fry compared with the city’s Circus Maximus, which accommodated around 250,000 people.

These days, safety regulations-not to mention the modern sports fan’s desire for a good view and comfortable seat — tend to keep stadium capacities (容量) slightly lower. Even soccer fans tend to have a seat each; gone are the days of thousands standing to watch the match.

For the biggest stadiums in the world, we have used data supplied by the World Atlas list so far, which ranks them by their stated permanent capacity, as well as updated information from official stadium websites.

All these stadiums are still functional, still open and still hosting the biggest events in world sport.

·Rungrado 1st of May Stadium, Pyongyang D.P.R. Korea. Capacity: 150,000. Opened: May 1,1989.

·Michigan Stadium, Ann Arbor, Michigan, U. S. Capacity: 107,601. Opened: October 1, 1927.

·Beaver Stadium, State College, Pennsylvania, U. S. Capacity: 106,572. Opened: September 17, 1960.

·Ohio Stadium, Columbus, Ohio, U. S. Capacity: 104,944. Opened: October 7,1922.

·Kyle Field, College Station, Texas, U. S. Capacity: 102,512. Opened: September 24, 1927.