Researchers in China and the United States have developed a new cataract(白内障)treatment with cells that has restored vision in babies in a trial and may eventually be used in adults.

    The treatment- by doctors and staff members at the University of California, San Diego School of Medicine and Sichuan and Sun Yat-sen universities in China-was published in March 9 edition of the scientific journal Nature.

    A cataract is a clouding of the normally clear lens(晶体)of an eye. Typical cataract operation involves the removal of the cloudy lens and the insertion of an artificial one. The new operation has been tested in animals and during a small, human trial. It resulted in fewer complications(并发症)than the current harmful operation, and in regrown lenses with superior visual function in all 12 of the baby cataract patients who received the procedure.

    A congenital cataract- lens clouding that occurs at birth or shortly after- is important cause of blindness in children. In the new research, Kand Zhang, head of ophthalmic genetics at US San Diego's Shiley Eye Institute, and his colleagues relied on the regrown potential of endogenous(同源的)stem cells.

    According to Zhang, endogenous stem cells are different from other stem cells that are typically grown in a laboratory, transplanted into a patient, and can have risks of immune（免疫的）rejection, infection or cancers. Zhang told CBS News, “We invented a new operation to make a very small opening at the side of a cataractous lens bag, remove the cataract inside, allow the opening to heal, and promote potential lens stem cells to regrow an entirely new lens with vision.”

    The human trial involved 12 babies under the age of 2 who were treated with the new method, while 25 babies received thee standard operation care.. The latter group experienced a higher incidence of pos- operation danger, early- onset eye high blood pressure and increased lens clouding. The scientists reported fewer complications and faster healing among the 12 babies who has the new procedure.

    You can love them or hate them, but no matter which tourist destination you visit, chances are you'll see someone with their head buried in a Lonely Planet guidebook.

    Lonely Planet is one of the world's largest travel guide brands, publishing more than 500 different guides in eight languages. The popular brand also produces television shows, websites and podcasts (播客) all devoted to travel.

     Some people praise Lonely Planet books because they make traveling easy and affordable. They also save time and make sure you don't miss the best things.

    They also provide the reviews of hostels, hotels, restaurants and ticket information about your destination.

    This can be great if you're a nervous traveler, or if you haven't traveled by yourself before. If you're in a country where you don't speak the language, sometimes there's nothing better than getting into a taxi and opening up a guidebook. You simply point to a map that directs the taxi driver to a hostel that's cheap and clean, with friendly staff and cold beer.

    But others criticize Lonely Planet and other travel guide publishers like them. They say guidebooks take the fun and spontaneity (自发性) out of traveling, and that part of the enjoyment of travel comes from the fact that anything can happen. They also regret that if you follow a guidebook, you'll end up doing the same thing and having the same experience as everyone else. You might end up seeing the same group of people over and over, because everyone is reading the same book and following the same route.

    Another criticism of travel guides is that they have a large impact on local communities. For example, some locals devote their lives to behaving in ways that attract tourists. They pretend to live a traditional lifestyle, wear traditional clothes and live in traditional houses in order to attract the tourist dollar.

    In agreement with the Agenda of the First Global Employment of Beijing Organizing Committee for the 2022 Olympic and Paralympic, the applicants from Hong Kong, Macao, Taiwan and overseas who have passed the first qualification review will take a written examination. Below lists the relevant information:

    ⒈Date & Time

    April 15th, 2017 (Saturday), 9:00 – 12:30.

    The applicants are required to enter the examination room before 8:30 am.

    ⒉Location

    No. 23 Baiduizijia, Haidian district, Beijing (Capital Normal University Dongyi Zone)

    Exam Site No.6; Exam Room: C206

    ⒊Notice

    ⑴All applicants who have passed the first qualification review please log on Personal application center of the recruitment page (http://recruit.beijing2022.cn) to download and print the admission ticket from April 7th -15th 2017.

    ⑵All candidates shall bring the admission tickets and valid IDs (Mainland Travel Permit for Hong Kong and Macao Residents, Mainland travel permit for Taiwan residents, Foreign passport and etc.)

    ⑶Please prepare one's own writing materials including 2B pencil, eraser and black/blue pen.

    ⑷The candidates will not be allowed to enter the examination room if late for 30mins, and will be also prohibited to leave within 60mins since the entering into the room or 15mins earlier than the deadline.

    Kind reminder: Due to the heavy traffic near the exam location, parking space will be so limited that all candidates should take public transport.

    ⒋Transport Route

    ⑴Subway: No.9 subway to Baiduizi station exit A, 50 meters to North.

    ⑵Bus: No. 61 / 92 bus to Shouti South Road South Gate station, and 3 minutes' walk to the destination.

    Kind reminder: Capital Normal University Dongyi Zone is not located in the main campus of Capital Normal University, please plan your route properly.

Beijing Organizing Committee for the 2022 Olympic and Paralympic Winter Games

    April 7, 2017

    Three miles is short by car, but when the three miles consists of an old wooden fence on a cattle farm that requires a fresh coat of paint, it's not a short distance any more. For the final week of summer heading into my first year of college, painting this fence was a disaster for me. At first it seemed like the most boring way to spend the last week of my wonderful freedom from school, but it actually turned out to be something intriguing.

    Luckily, I wasn't alone in this task; I got the help of Rob, the farm manager. When two people were stuck under the sun of August in the middle of rural Kentucky for ten hours a day, there wasn't much to do to help pass the time. Standing in front of this fence was the last thing on Earth I wanted to do. I worked with Rob all these days, spending over hours with him with nothing to do but a boring task, and all we had for amusement was conversation. In a society filled with constant entertainment, this was a huge contrast.

    It started out simply, and we talked about the weather, sports, and how annoying it was to get the fence painted. As the week progressed, so did our topics of discussion. From family and funny childhood stories to our hobbies and dreams, we began to know more about each other. We shared personal stories with each other, little pieces of our past and ourselves. I had spent plenty of time with people whether it was about sporting events, movies, or concerts, but never had I spent so much time with one person with absolutely nothing to break the silence. It was uncomfortable at first, but things changed.

    Sometimes we tried to keep ourselves busy, entertained, or from getting bored. There is a deeper connection you get with people when all you're doing is talking. For a moment, you get an inside look into their mind, heart and soul. This is what humans are good at—sharing themselves. Whether we realize it or not, this is happening all the time all around us.

    In Western countries people have been using the installment plan since the first half of the twentieth century. Today, a large number of families in Great Britain buy furniture, household goods and cars by installments In the U. S. A, the figure is much higher than in Great Britain, and people there spend over 10 percent of their income on the installment plan.

    The price of an article bought on installments is always higher than the price that would be paid by cash. There is a charge for interest. The buyer pays one quarter or one third of the price as a down payment when the goods are delivered to him. He then makes regular payments, weekly or monthly, until the full price is paid up. The legal ownership of the goods remains with the seller until the final payment has been made.

    Installment buying has advantages and disadvantages. It can help couples with small incomes to furnish their homes and star housekeeping. It increases the demand for goods, and in this way helps business and employment. There is, however, the danger that when business is bad, installment buying may end suddenly, making business much worse. This may result in a great increase in unemployment. If the people on the installment plan lose their jobs, they will probably not be able to make their payments. If great numbers of people are not able to pay their installment debts, there is a possibility that businessmen cannot collect their debts and will therefore lose money. If businessmen lose money or fail to make a satisfactory profit, it becomes more likely to have a depression. This is why, in some countries,the government controls the installment plan by fixing the amount of the down payment and installments to discourage people from buying more than they can pay for on the installment plan.

    Moving flight times from night to day could reduce air travel's contributions to global warming, a new study suggests. Scheduling more (lay time flights may reduce the influence of contrails ——the visible lines of white steam that many planes leave behind them in the sky.

    The role of contrails in climate change is still being studied, but some scientists believe they contribute to the greenhouse effect by trapping heat in the atmosphere.

    Nicola Stuber, first author of the study, suggests that contrails' overall impact on climate change is almost as big as that of aircraft^? s carbon dioxide emissions (排放)over a hundred-year period. Aircraft are believed to be responsible for 2-3% of human carbon dioxide emissions. Like other high, thin clouds, contrails reflect sunlight back into space and cool the planet. However, they also trap energy in the atmosphere and increase the warming effect.

    Stuber and other scientists believe that the effect of the contrails is big. "On average, the green-house effect controls the effects of contrails, said Stuber, a meteorologist at England's University of Reading." The warming effect is far greater for contrails left by night flights," Stuber added. "The cooling effect only happens (luring the day when the sun is up. During the night the greenhouse warming is no longer balanced and that is why the contribution of night-flight is so large."

    Most commercial airline traffic occurs during daylight hours. For example, only one in four United Kingdom flights is a night flight, but those flights create some 60% of the warming created by contrails, the study reports.