Decision—thinking is not unlike poker—it often matters not only what you think, but also what others think you think what you think they think you think. The mental process(过程) is similar. Naturally, this card game has often been of considerable interest to people who are, by any standards, good thinkers.

    The great mathematician John von Neumann was one of the founders of game theory. In particular, he showed that all games fall into two classes; there are what he called games of 'perfect information', games like chess where the players can't hide anything or play tricks; they don't win by chance, but by means of logic and skills. Then there are games of 'imperfect information', like poker, in which it is impossible to know in advance that one course of action is better than another.

    One mistaken idea about business is that it can be treated as a game of perfect information. Quite the reverse Business, life itself are games which we must normally play with very imperfect information. Business decisions are often made with many unknown and unknowable factors(因素), best poker players. But few business people find it comfortable to admit that they are taking a chance, and many still prefer to believe that they are playing chess, not poker.

    Online shopping has become more and more popular these years. Women have jumped ahead of men for the first time in using the Internet to do their holiday shopping, according to a study published last week in the US.

    For years men have been more likely to shop on the Internet than women, but during the 2013 holiday season 58 percent of those shopping online were women.

    “It shows how popular the Internet is becoming,” said Lee Rainie, director of the Pew Internet and American Life Project group, which carried out the study. Rainie said it was only a matter of time before women shoppers caught up with men. This is because women traditionally make decisions about spending.

    Users were more likely to shop online to save time. Internet users between the ages 18 and 29 were responsible for some of the surprising increase in the online gift-buying population this time around.

    However, three-quarters of the US Internet users did not buy holiday gifts online in 2013. They worried about credit card security(信用卡安全), or just compared online prices with off-line prices, then dashed off to the shops to get the best deals.

    “But even if shoppers don't buy online, websites are becoming promotion(促销) tools for stores,” said Dan Hess' vice president of Com Score Network Inc. Hess said that actually most stores, websites can make customers fully believe the security of their credit card numbers. And most are able to ensure that gifts arrive on time.

    “It's all about making the shopping experience more efficient(效率高的), more reliable and more comfortable.” Hess said.

    Sometimes known as “The Big Apple” or “the City That Never Sleeps”, New York is both the most populous city in the USA and a leading center of business, commerce, finance and media. The city is often referred to as “New York City”, in order to distinguish it from the state it is in. The city is part of a large metropolitan（大都市的）area, and the combined city population exceeds 18.7 million.

    New York City is made up of five boroughs（行政区）and hence another nickname of the city is “The Five Boroughs”. The five boroughs are: The Bronx, Brooklyn, Manhattan, Queens and Staten Island.

    There are many famous buildings and sights in New York, especially in Manhattan. These include the Empire State Building, the Flatiron Building and the United Nations Building. When you visit New York, make sure you see Central Park, Times Square, Chinatown, Little Italy and of course the Statue of Liberty. Additionally, there are many wonderful museums in New York, some truly excellent shops, some of the world's best theaters in the Broadway area, and the neighborhoods of Greenwich Village and SoHo which are well-known for the artists who reside there.

    Getting around New York City is simple—the city's subway network is one of the most comprehensive in the world, connecting all parts of Manhattan in rapid time.

    However, the best way to see New York is undoubtedly on foot. Central Park is an ideal place to start a walking tour of New York City—843 acres of shining ponds and lush greenery attract locals and tourists. And apart from offering breathtaking scenery, it is a centre for recreation. Visitors can listen to music groups, watch performers, walk along the trails and even take a romantic ride in a horse carriage.

    While elephants born without tusks (长牙)are not unheard of，they normally form just 2 to 6 percent of the population. However, that is not the case at Mozambique's Gorongosa National Park, where an astonishing 33 percent of female elephants born after the country's civil war ended in 1992 are tuskless. While that may appear to be just a coincidence, Joyce Poole, an elephant behavior expert, has another theory. The researcher thinks we may be witnessing unnatural evolution of the species due to the constant hunting of elephants for valuable ivory.

    Poole says before the country's 15-year-long civil war, the 100,000—acre park was home to over 4,000 elephants. However, by the time the conflict ended in 1992, about 90 percent of them had been killed for ivory to help finance weapons (武器)and meat to feed the soldiers. Of the less than 200 survivors, over 50 percent of adult females had no tusks. Therefore, it is not surprising that the park's tuskless elephant population has grown greatly.

    This is not the first time researchers have observed a great change in the population of elephants. At Zambia's South Luangwa National Park and Lupande Game Management Area ， areas which were heavily hunted in the 1970s and 1980s, 35% of elephants 25 years or older and 13% of those younger than 25 are now without tusks. A 2008 study published in the African Journal of Ecology found that the numter of tuskless females at the Ruaha National Park in Tanzania went from 10.5 percent in 1969 to almost 40 percent in 1989, largely due to illegal hunting for ivory.

    The recent ban on ivory in both the US and China should help get rid of, or at least reduce, elephant hunting. However, scientists are not sure how long it will take for elephants with a higher rate of tuskless females, to change the trend.

    On a sunny, spring day, a group of children, four to seven years old, sit on their bicycles. They wear helmets to protect their heads and gloves to protect their hands. Their mothers, standing nearby, watch them closely. The children are ready to learn how to ride. Rachel Varn still remembers how she felt riding a bicycle for the first time. She says, "It is probably the biggest confidence booster (提升). It gives kids such a sense of independence and self-guidance." Now, her job is helping children experience that moment.

    Rachel Varn left her job of selling bicycles to become a trainer for bicycle riding last year. She founded Pedal Power Kids to teach bicycle education. Before starting a ride she teaches the children how to make sure the bicycles are in good condition for safe use. She calls it " the ABC quick check." "A" is for air. she explains, "We have to check out tires before we ride. "B" is for brakes. We want to make sure our brakes work before we find ourselves at the top of a hill about to go down. And "C" is for chain." She says the chain must be clean.

    The rest of the training is more fun. The children learn riding skills, from balance and pedaling to turning, starting and stopping. And they learn to keep their eyes up and look ahead while riding. Varn says many children struggle to do this. They look down at the pedals instead. She adds, " Obviously that doesn't allow them to see what's going on around them, and it doesn't allow them to turn properly either." Varn says watching where you are going helps you turn easier.

    Learning to ride a bicycle can open a whole new world to children. It gives them a sense of accomplishment and freedom. They become more sensitive to their surroundings and better able to make safe, smart decisions going from one place to another. Varn's goal is to get more children on two wheels. She says," That's really a great way for kids to be active and develop healthy habits. It helps reduce pollution and just keep families and communities connected."

   A year back I received a full scholarship(全额奖学金) to attend the University of San Francisco. All of my hard work had paid off. My mom had spent a lot in my attending a private high school, so I made sure to push myself: I volunteered, got involved in(参与) various clubs, and graduated with honors. I was so excited to start a new chapter(篇章) of my life. I had totally packed two weeks before it was time to leave. 
    Soon enough, the big day came, but it wasn't like what I had thought. The first two weeks were the most difficult days of my entire life. Every night I would cry myself to sleep. I was so homesick and I didn't know how to deal with my broken heart. To distract myself, I threw myself into my studies and I applied for a ton of jobs. In any remaining free time, I started forcing myself to the gym. I wanted to keep every part of my day busy so I wouldn't think how lonely I felt. 
    Soon after, I began to limit food, and then I became worse. Finally, I went to see a doctor. When the doctor weighed me, I was crazy about the number of my weight. So I continued to lower my goal, and convinced(坚信) that controlling this number was the solution for my homesickness. But when I was told that I had no choice but to spend time on my studies. I quickly started recovery in my mind. 
    How could I do? I told myself that school was what I was best at. I decided to get rid of my homesickness and took exercise actively. My first term of college had passed by at last and I had gotten straight(连续的) A's. That's why I want to share my story—to help other students feel less lonely.