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    FLORENCE, Italy—Svetlana Cojochru feels hurt. The Moldovan has lived here seven years as a caregiver to Italian kids and the elderly, but in order to stay she's had to prove her language skills by taking a test which requires her to write a postcard to an imaginary friend and answer a fictional job ad.

    Italy is the latest Western European country trying to control a growing immigrant(移民) population by demanding language skills in exchange for work permits, or in some cases, citizenship.

    Some immigrant advocates worry that as hard financial times make it more difficult for natives to keep jobs, such measures will become more a vehicle for intolerance than integration(融合). Others say it's only natural that newcomers learn the language of their host nation, seeing it as a condition to ensure they can contribute to society.

    Other European countries laid down a similar requirement for immigrants, and some terms are even tougher. The governments argue that this will help foreigners better join the society and promote understanding across cultures.

    Italy, which has a much weaker tradition of immigration, has witnessed a sharp increase in immigration in recent years. In 1990, immigrants numbered some 1.14 million out of Italy's then 56.7 million people, or about 2 percent. At the start of this year, foreigners living in Italy amounted to 4.56 million of a total population of 60.6 million, or 7.5 percent, with immigrants' children accounting for an even larger percentage of births in Italy.

    Cojochru, the Moldovan caregiver, hoped obtaining permanent residence(居住权) would help her bring her two children to Italy; they live with her sister in Moldova, where salaries are among the lowest in Europe. She was skeptical that the language requirement would encourage integration.

    Italians always “see me as a foreigner,” an outsider, even though she's stayed in the country for years and can speak the local language fluently, she said.

    Visitors must present all carried items for inspection upon entry. After inspection, all bags, backpacks, umbrella, parcels and other items as determined by security officers must be left at the checkrooms, free of charge, close to each entrance. All oversized bags, backpacks and luggage must be left at the checkrooms near the 4^th Street entrance of either the East or West Building. These items will have to be x-rayed before being accepted. Items of value, such as laptop computers, cameras and fur coats, may not be left in the checkrooms but may be carried into the gallery. We regret that the museum doesn't have enough space for visitors items larger than 17*26 inches in the gallery.

    Additional security procedures and checks may be taken according to the decision of the gallery.

    *For the safety of the artworks and other visitors, nothing may be carried on a visitor's back. Soft front-baby carriers are allowed, but children may not be carried on shoulders or in a child carrier worn on the back. Wheelchairs are available free of charge near each checkroom.

    *Smoking is prohibited. Food and drink are not permitted outside the food service areas. Unopened bottled water may be carried only in a visitor's bag. Cell phones may not be used in the gallery.

    *Animals, other than service animals, are not permitted.

    *Skateboarding is prohibited.

    *Picture-taking(including video) for personal use is permitted except in the special exhibits.

    *Please don't touch the works of art.

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Plastic-Eating Worms

    Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

    Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms' stomachs. Their findings were published in Current Biology in 2017.

    Federica Bertocchini, co-author of the study, says the worms' ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂

    Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

    Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂

The Museum of Science and Industry

    The Manchester Museum of Science and Industry will give us a more wonderful interpretation of the museum. The 2.8 hectare museum was rebuilt on the site of a huge Victorian warehouse and the world's oldest passenger train station. The number and type of collections are ranked first, and in the power exhibition hall, steam engines used during the Industrial Revolution can still be seen. The display of the railway here is rich and vivid in content. Understanding the history of the Industrial Revolution, the Manchester Museum of Science and Industry is a good choice.

    Power is the central theme of the museum, whether it is a bicycle or a steam engine, not to mention an old car. The history of mankind, as this museum shows, has been constantly running. All human inventions can't be separated from this idea. Life is also about exercise. All the exhibits in the museum are alive. The workers oil and wipe every day. Finally, steam is imported into the machinery to make them run as usual as they did a hundred years ago. Time is also reversed.

    In the power exhibition hall, the steam engine that had been used during the Industrial Revolution was still roaring, and the influence was not reduced. If you want to understand the Industrial Revolution and the role of Manchester in it, you must come and visit it, and you will find answers from the many wonderful exhibitions here.

    The Manchester Museum of Science and Industry completely reproduced the British Industrial Revolution, and ensured that the machines of its scientific and technological inventions operated daily, so that visitors and school children could experience the Industrial Revolution. Therefore, the museum has become an outstanding model for preserving industrial heritage.

    Manchester was known as Cotton Capital, Northern Capital, Second City, and Warehouse City for the Industrial Revolution. The Manchester Museum of Science and Industry is located in the center of Manchester City. It records the cradle (摇篮) of the Industrial Revolution with historical details. Manchester City's history, textiles, energy, communications, aviation, transportation and other industries have risen and fallen with the development of science and technology.

    More information: visit https://www.msichicago.org/

    Address: 150 Deansgate Manchester M3 3EH

    Main traffic: Bus 255 to Manchester City Centre

    Open daily: from 10:00 to 17:00

    Tour tickets: free

    I'm a storyteller. And I would like to tell you a few personal stories.

    I grew up reading British and American children's books. When I began to write, I wrote exactly the kinds of stories I was reading: All my characters were white and blue-eyed, they ate apples and talked a lot about the weather, despite the fact that I lived in Nigeria. We ate mangoes, and we never talked about the weather. Because all I had read were books in which characters were foreign, I had become convinced that books by their very nature had to have foreigners in them. Things changed when I discovered African books. Because of writers like Chinua Achebe and Camara Laye, I went through a mental shift in my idea of literature. I realized that people like me, girls with skin the color of chocolate, could also exist in literature. I started to write about things I recognized. So what the discovery of African writers did for me was this: It saved me from having a single story of what books are. The year I turned eight, we got a new house boy Fide from a nearby rural village. The only thing my mother told us about him was that his family was very poor. And when I didn't finish my dinner, my mother would say，"Finish your food! Don't you know? People like Fide's family have nothing." So I felt enormous pity for Fide's family. Then one Saturday, we went to his village to visit, and his mother showed us a beautifully patterned basket that his brother had made. I was astonished. It had not occurred to me that anybody in his family could actually make something. Their poverty was my single story of them.

    Years later, when I left Nigeria to go to university in the United States, my American roommate asked where I had learned to speak English so well, and was confused when I said that Nigeria happened to have English as its official language. What struck me was this: She had felt sorry for me even before she saw me. My roommate had a single story of Africa: a single story of catastrophe.

    Of course, Africa is a continent full of catastrophes. But there are other stories that are not about catastrophe, and it is very important, it is just as important, to talk about them. The consequence of the single story is this: It robs people of dignity. It makes our recognition of our equal humanity difficult. It emphasizes how we are different rather than how we are similar.

    So what if my mother had told us that Fide's family was poor and hardworking? What if we had an African television network that broadcast diverse African stories all over the world? What if my roommate knew about my Nigerian publisher, Muhtar Bakare, a remarkable man who left his job in a bank to follow his dream and start a publishing house? What if my roommate knew about my friend Funmi Iyanda, a fearless woman who hosts a TV show, and is determined to tell the stories that we prefer to forget?

    My Nigerian publisher and I have just started a non-profit called Farafina Trust, and we have big dreams of building libraries and providing books for state schools, and also of organizing lots of workshops in reading and writing, for all the people who are eager to tell our many stories.

    Stories matter. Many stories matter. Stories can break the dignity of a people, but stories can also repair that broken dignity. When we realize that there is never a single story about any place, we regain a kind of paradise.

    Runners never forget crossing the finishing line at their first marathon, and that will be especially true for Mike Kohler. When Kohler crossed the starting line in Fargo last Saturday, he thought he was going to run 13.1 miles, his first half marathon. Six hours later, he had "mistakenly” completed his first full marathon, 26.2 miles.

    Kohler, a 26-year-old plumber (水管工) who now lives in West Fargo, had lined up for the half marathon that he hoped to complete in 150 minutes. He didn't realize he was in a starting fence with the full marathoners. Several miles later, Kohler began to realize he was on the course for the full marathon. "The 8-mile mark was when I figured out that I had made a mistake," he said. "Between then and 13.1, I debated with myself about what I should do."

    At some point — he doesn't remember when — he doubled down on the distance. "After I decided I was going to keep going, the thought of quitting didn't come back. Run, walk, or crawl, I wanted to finish," he said.

    Until Saturday, Kohler's longest race was a 10-kilometer run, just over 6 miles. Even the most casual marathoners do a training run of 18 miles before the race. From his experience, he said he learned one thing: sometimes people can do more than they think they can.

    After his long race, he went right back to work, put in a 10-hour day and then boarded a flight to Scotland for a vacation. "I was pretty sore, but I found the more I kept moving, the less sore I was, so I tried my best to go about life normally — minus running,” Kohler said from Glasgow. "I needed a break from that for a bit."

    Not for too long, though. He's already considering the Bemidji Blue Ox Marathon in October.