Suppose you become a leader in an organization. It's very likely that you'll want to have volunteers to help 

with the organization's activities. To do so, it should help to understand why people undertake volunteer work and

what keeps their interest in the work.

       Let's begin with the question of why people volunteer. Researchers have identified several factors that 

motivate people to get involved. For example, people volunteer to express personal values related to unselfishness, 

to expand their range of experiences, and to strengthen social relationships. If volunteer positions do not meet these 

needs, people may not wish to participate. To select volunteers, you may need to understand the motivations of the 

people you wish to attract.

         People also volunteer because they are required to do so. To increase levels of community service, some 

schools have launched compulsory volunteer programs. Unfortunately, these programs can shift people's wish of

participation from an internal factor (e.g., “I volunteer because it's important to me”) to an external factor (e.g., “I

volunteer because I'm required to do so”). When that happens, people become less likely to volunteer in the future.

People must be sensitive to this possibility when they make volunteer activities a must.

          Once people begin to volunteer, what leads them to remain in their positions over time? To answer this 

question, researchers have conducted follow-up studies in which they track volunteers over time. For instance, one 

study followed 238 volunteers in Florida over a year. One of the most important factors that influenced their 

satisfaction as volunteers was the amount of suffering they experienced in their volunteer positions. Although this

result may not surprise you, it leads to important practical advice. The researchers note that attention should be 

given to “training methods that would prepare volunteers for troublesome situations or provide them with 

strategies for coping with the problem they do experience”.

         Another study of 302 volunteers at hospitals in Chicago focused on individual differences in the degree to 

which people view “volunteer” as an important social role. It was assumed that those people for whom the role of 

volunteer was most part of their personal identity would also be most likely to continue volunteer work. 

Participants indicated the degree to which the social role mattered by responding to statements such as 

“Volunteering in Hospital is an important part of who I am.” Consistent with the researchers' expectations, they

found a positive correlation (正相关) between the strength of role identity and the length of time people continued 

to volunteer. These results, once again, lead to concrete advice: “Once an individual begins volunteering, 

continued efforts might focus on developing a volunteer role identity.... Items like T-shirts that allow volunteers to 

be recognized publicly for their contributions can help strengthen role identity”.

    Recently some articles claims the word "selfie" as one of the most annoying words. But I'd like to offer that maybe it is not so bad.

    The “selfie” is used to describe the self-taken photo, often from a smart phone. Women and men decorate their Facebook, Twitter, and Instagram accounts with these pictures, sometimes with puckered (翘起) lips or large smiles. In fact, the selfie has become so widely known that over 31 million photos on Instagram are taken with the selfie.

    Let's think about it. Someone takes about 10 selfies each time they do, and they only end up posting one or two of those. They pick the one that they feel makes them look the best. Isn't that beautiful? In that one picture, someone has given himself or herself confidence. Self-image is important. In society today, we are often so consumed with the feeling that what society tells us is perfect. But maybe, with that one selfie, we feel that we fit that bill. We feel handsome, beautiful, confident, smart, happy and content. For that moment, everything bad or terrible that has ever happened to us is erased (消除), because that smile or that pucker is what gives us the determination to love ourselves.

    I saw a spoken word poem recently and the young man said: If I ask you what you love, the answers will most likely roll off your tongue. You love to read. You love to write. You love birds, music, your mom, your brother, your sister, your daughter, your best friend, your dog. How long do you think you can go on and on before you say “I love myself”.

    That statement hit me like a ton of bricks. I've struggled with confidence all of my life. I still do. And in no way am I saying that taking a selfie is a gateway to that confidence. However, the selfie does deserve some credit for allowing individuals to express themselves. Pamela Rutledge agrees, stating, “There are many more photographs available now of real people than models.”

    You might think that “global warming” means nothing more than a rise in the world's temperature. But rising sea levels caused by it have resulted in the first evacuation (撤离) of an island nation, the citizens of Tuvalu will have to leave their homeland.

    During the 20th century, sea level rose 8~12 inches. As a result, Tuvalu has experienced lowland flooding of salt water that has polluted the country's drinking water.

    Paani Laupepa, a Tuvaluan government official, reported to the Earth Policy Institute that the nation suffered an unusually high number of fierce storms in the past ten years. Many scientists connect higher surface water temperatures resulting from global warming to greater and more damaging storms.

    Laupepa expressed dissatisfaction with the United States for refusing to sign the Kyoto Protocol, an international agreement calling for industrialized nations to reduce their greenhouse gas emissions (排放), which are a main cause of global warming. “By refusing to sign the agreement, the US has effectively taken away the freedom of future generations of Tuvaluans to live where their forefathers have lived for thousands of years.” Laupepa told the BBC.

    Tuvalu has asked Australia and New Zealand to allow the gradual move of its people to both countries.

    Tuvalu is not the only country that is vulnerable (易受影响的) to rising sea levels. Maumoon Gayoon, president of the Maldives, told the United Nations that global warming has made his country of 311,000 an “endangered nation”.

    WeChat, the Chinese social media smartphone app, saw an increase in user numbers of 41 percent year on year to 500 million at the end of last year, in a sign that parent company Tencent is extending its reach for the mobile Internet. As one of the largest Internet integrated service providers in Chinaand one of the most Internet users in China, Tencent's profit grew 24 percent to RMB 20.98 billion per year, slightly higher than forecasts, driven mainly by online gaming profits. It is unclear how much WeChat contributed to Tencent's profits but the app's growth is a strong indicator of the company's long-term health as it tries to adjust its business to be more suitable for mobile devices.

    "We extended our leadership in games and online media, and made breakthroughs in emerging platforms such as online security and mobile payments." Ma Huateng, Tencent chairman, said in a statement. WeChat is the second highest ranked social app in China, behind QQ, Tencent's another chatting app, which claimed to have 815 million registered monthly users at the end of 2014.

    Tencent has been unwilling to earn money through WeChat by flooding it with advertising, which could influence the users' experience. But this is expected to change. Some analysts anticipated(预期) that advertising would be introduced on a large scale later this year. Early attempts to test ads on the service have not always gone smoothly. After a BMW ad was introduced on some users' feedbacks in January, many users who were not targeted by the brand's marketing complained of "discrimination" by Tencent's data mining algorithm(数据挖掘算法). They claimed it unfairly treated them as not wealthy or successful enough to view the BMW ad.

    Throughout history scientists have risked their health and their lives in their search for the truth.

    Sir Isaac Newton, the seventeenth century scientist, was very smart, but that didn't stop him from doing some pretty stupid things. In his laboratory in Cambridge he often did the strangest experiments. Once, while testing how light passes through lenses (晶状体), he put a long needle into his eye, pushed it to the back, and then moved it around just to see what would happen. Luckily, nothing long-lasting did. On another occasion he stared at the sun for as long as he could bear, to discover what effect this would have on his sight. Again he escaped suffering permanent damage, though he had to spend some days in a darkened room before his eyes recovered.

    In the 1750s the Swedish chemist Karl Scheele was the first person to find a way to produce phosphorus (磷). He in fact discovered eight more chemical elements including chlorine (氯), though he didn't get any praise for them. He was a very clever scientist, but his one failing was a curious habit of tasting a little of every substance he worked with. This risky practice finally caught up with him, and in 1786 he was found dead in his laboratory surrounded by a large number of dangerous chemicals, any of which might have been responsible for his death.

    Eugene Shoemaker was a respected geologist. He spent a large part of his life studying craters (火山口) on the moon, and how they were formed, and later did research into the comets of the planet Jupiter. In 1997 he and his wife were in the Australian desert where they went every year to search for places where comets might have hit the earth. While driving in the Tanami desert, normally one of the emptiest places in the world, another vehicle crashed into them and Shoemaker was killed on the spot. Some of his ashes (骨灰) were sent to the moon aboard the Lunar Prospector spacecraft and left there — he is the only person who has had this honor.

    A new study has found the amount of antibiotics(抗生素)given to farm animals is expected to increase by two-thirds over the next 15 years. Researchers are linking the growing dependence on the drugs to the increasing need for meat, milk and eggs. However, the drugs could quicken the development of antibiotic-resistant infections(感染). Such infections are already a major public, health concern in the United States.

    The World Health Organization notes when people stop living in poverty(贫困), the first thing they want to do is eat better, rather than earn more money. For most people, that means their diet should contain more meat. With the rapid development of Asia, people there are eating nearly four times as much meat, milk and other milk products as they did 50 year ago.

    To meet the need, farmers have put many animals into smaller spaces. As the animals are crowded together, the easiest way to deal with some of the problems of crowding is to give them antibiotics. It's clear that antibiotics help animals stay healthy in a crowded environment and grow faster. But bacteria can develop resistance to the drugs gradually.

    Nowadays, doctors find antibiotics that once worked against the infections no longer work. The bacteria have learned ways to fight against the drugs. The heavy use of antibiotics in animals is responsible for the growth of antibiotic resistance worldwide. In the United States, at least two million people get drug-resistant infections each year and at least 23,000 die from an infection.

    Europe has banned the use of antibiotics to increase animal growth. And the United States is hoping to persuade farmers to stop using antibiotics for that purpose.