Disposing(处理) of waste has been a problem since humans started producing it. As more and more people choose to live close together in cities, the waste-disposal problem becomes increasingly difficult.

    During the eighteenth century, it was usual for several neighboring towns to get together to select a faraway spot as a dumpsite. Residents or trash haulers(垃圾托运者) would transport household rubbish, rotted wood, and old possessions to the site. Periodically(定期的) some of the trash was burned and the rest was buried. The unpleasant sights and smells caused no problem because nobody lived close by.

    Factories, mills, and other industrial sites also had waste to be disposed of. Those located on rivers often just dumped the unwanted remains into the water. Others built huge burners with chimneys to deal with the problem.

    Several facts make these choices unacceptable to modern society. The first problem is space. Dumps, which are now called landfills, are most needed in heavily populated areas. Such areas rarely have empty land suitable for this purpose. Property is either too expensive or too close to residential(住宅区的)neighborhoods. Long-distance trash hauling has been a common practice, but once farm areas are refusing to accept rubbish from elsewhere, cheap land within trucking distance of major city areas is almost nonexistent.

    Awareness of pollution dangers has resulted in more strict rules of waste disposal. Pollution of rivers, ground water, land and air is a price people can no longer pay to get rid of waste. The amount of waste, however, continues to grow.

    Recycling efforts have become commonplace, and many towns require their people to take part. Even the most efficient recycling programs, however, can hope to deal with only about 50 percent of a city's reusable waste.

Time:2017-01-24     From:kekenet.com        Editor: clover

    The head of China's largest online seller Alibaba does not think China and the United States will have a trade war despite comments from the Trump administration.

    Jack Ma is the chairman of the Alibaba Group. At the World Economic Forum meeting in Davos, Switzerland, he said, "China and (the) U.S. will never have a trade war. Give Trump some time. He's open-minded, he's listening."

    The Chinese billionaire said he would do all he could to prevent trade relations between the countries from getting worse.

    Last week, Ma met with Trump at the Trump Tower in New York City. The Chinese billionaire is said to have discussed a plan to permit one million small U.S. businesses to sell goods on Alibaba's online shopping platform.

    During the campaign and after winning the presidential election, Trump strongly criticized the Chinese government's support for its businesses. He blamed unfair trade policies for taking away U.S. jobs. And he said that China unfairly controls the exchange value of its currency, the yuan.

    Trump also has threatened to place import taxes on goods from China and other countries in response to their trade policies.

    According to the South China Morning Post, Ma said, "American international companies made millions and millions of dollars from globalization." He added that the U.S. should not blame the loss of jobs and companies on globalization.

    However, a new study by an American business group says many U.S. businesses feel unwelcome in China. The companies say the cost of doing business in China is increasing. They add that rules and regulations are unclear or not enforced in a consistent way.

    The American Chamber of Commerce in China led the study, which looked at responses from 462 companies.

    William Zarit is chairman of the chamber. He says trade policies in China make it difficult for American companies. He says, "we feel that over the last few years that we've been taken advantage of to some extent, with our open market and the lack of open areas in the Chinese market."

    Another major concern for U.S. companies in China is fake products. Fake products are copies of the originals that cost businesses with the legal right to sell them millions of dollars each year.

    Ma defended Alibaba's efforts to fight fake products on its shopping platform. He said his company is doing all it can to fight the problem.

    "Fighting against fake products is a war against human greediness," Ma said.

    I'm Mario Ritter.

    During the cold winter days, there are some interesting festivals in the world. Look at the following ones.

    Harbin Ice and Snow Festival

    Place: China

    Time: January 5 to February 5

    People build incredible things out of ice and snow, decorating them with lights.

    The Carnival of Venice

    Place: Italy

    Time: between February and March

    One of the most beautiful festivals in the world, people wear masks and elaborate costumes to hide differences among classes, and there are contests for the best costumes.

    Holi Festival

    Place: India

    Time: late February/ March, on the last full moon day

    Hindus and Sikhs, in India, Nepal, and Sri Lanka celebrate the main day of this incredibly fun 16-day festival by throwing colored powder and water at each other.

    Sundance Film Festival

    Place: Utah, the US

    Time: end of February

    The largest independent film festival in the US. Watch both feature films and shorts. You need to buy a ticket.

    What do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be unclear. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or the birth of a new baby.

    How might this inability to recall early experiences be explained? The passage of time does not account for it; adults have excellent recognition of pictures of people who attended high school with them 35 years earlier. Another seemingly reasonable explanation—that infants do not form enduring memories at this point in development—also is incorrect. Children two and a half to three years old remember experiences that occurred in their first year, and eleven month olds remember some events a year later.

    However, three other explanations seem more promising. One involves physiological changes relevant to memory. Maturation of the frontal lobes (额叶) of the brain continues throughout early childhood, and this part of the brain may be critical for remembering particular episodes in ways that can be recalled later. Demonstrations of infants' and very young children's long-term memory have involved their repeating motor activities that they had seen or done earlier, such as reaching in the dark for objects, putting a bottle in a doll's mouth, or pulling apart two pieces of a toy. The brain's level of physiological maturation may support these types of memories, but not ones depending on clear verbal descriptions.

    A second explanation involves the influence of the social world on children's language use. Hearing and telling stories about events may help children store information in ways that will endure into later childhood and adulthood. Through hearing stories with a clear beginning, middle, and ending children may learn to take out the idea of events in ways that they will be able to describe many years later. Consistent with this view parents and children increasingly engage in discussions of past events when children are about three years old. However, hearing such stories is not sufficient for younger children to form enduring memories. Telling such stories to two year olds does not seem to produce long-lasting verbalizable memories.

    A third likely explanation for infantile memory loss involves mismatch between the ways in which infants encode information and the ways in which older children and adults recall it. Whether people can remember an event depends critically on the fit between the way in which they earlier encoded the information and the way in which they later attempt to recall it. The better the person is able to reconstruct the perspective from which the material was encoded, the more likely that recall will be successful.

    A new discovery may change how scientists think about prehistoric humans. Human history is more of a war movie than a romantic comedy, at least as far as other animals are concerned; we may be causing one of the planet's great extinction events at the moment. But a recent discovery means humans might not be as destructive as we thought.

    Large animals have a history of disappearing when humans move to their areas. Scientists have long believed that humans simply hunted big animals because people are really good at hunting. For example, scientists thought humans arrived in Madagascar around 4,000 years ago, but only two thousand years later, giant lemurs, giant tortoises and elephant birds disappeared from the island. Many scientists thought humans had something to do with that rapid drop in biodiversity(生物多样性).

    At least, that's what scientists thought until a group of researchers dug up a lot of bones in Madagascar recently. These bones belonged to the elephant bird, a kind of extinct bird that weighed up to 1,000 pounds. The huge bones were covered in cuts that clearly came from a human hunter. The researchers found that the humans had killed the birds 10,000 years ago...Thousands of years before scientists believed humans had come to the island.

    "Our research provides evidence of human activity in Madagascar more than 6,000 years earlier than suspected, which shows that a different extinction theory is required to understand the huge biodiversity loss that has happened on the island." explained James Hansford, one of the researchers. "Humans seem to have coexisted with elephant birds and other now-extinct species for over 8,000 years, clearly with limited negative influence on biodiversity for most of this period."

    If humans lived among large animals for thousands of years without wiping them out, then maybe our species can't wipe other species out. Rather, extinction is more of a habit we've learned. Perhaps we can unlearn it too.

    The clock always seems to be ticking rather too fast in the doctor's office and the queue of patients outside the door seems to be pressing rather too hard. Some say it's high time for the model of short, sharp one-to-one appointments to give way to shared medical appointments (SMAs共享医疗预约).

    SMAs are doctor-patient visits in which a group of patients receive patient education and counseling (咨询), physical examination and medical support in a group setting. Typically SMAs are designed to have one or more doctors attend to a group of patients who share a common illness or medical condition. In contrast to one-to-one visits, SMAS provide a longer appointment time-frame as well as the opportunity for patients to have improved access to their physicians and meanwhile pick up additional information and support from peers.

    However, doctors who have pioneered the shared appointment approach report that there are significant challenges involved. Dr. Sumego, director of shared medical appointments, Cleveland Clinic, identifies culture change as the most significant challenge. Physicians and nurses are trained in a model of personal service and privacy; the SMA approach is a fundamental challenge to those fixed ideas. They need shared goals and a way of testing the innovation against agreed standards. Dr. Sumego says, "The physicians may be worried about the possible chaos and efficiencies that are marketed. They also have to make the patients understand what their appointment is, and what the expectation is."

    "So, if an organization was looking to start shared medical appointments, I would advise them to start the buy-in from a few champion physicians, develop the work-flow and develop some experience. Provide some support behind what that best practice should look like. Create some standards so that, as the concept spreads, you can employ that experience to start the next shared medical appointments and the next."