Dear Anne,

    I like your column very much. I met a girl four years ago at a gym. She was the one who originally approached me and we became good friends. Then one day, she made me really angry, so angry that I just left and we never saw each other again.

    Looking back, I really regret ending things that way. It was a cowardly act on my part, but I had a terrible temper at that time and let the smallest thing get to me. Recently, I've started thinking about her again and I looked up her e-mail address. I thought about writing to say “Hi” and apologize for what I did but I'm not sure. She could still be angry with me, or maybe she has forgotten me. I feel very lonely and I want to see her again. What should I do?

Tom

Dear Tom,

    She may still be angry with you, and she may have forgotten the friendship between you, but that doesn't mean she doesn't deserve an apology. Tom, how many of us have wished for the day that someone who treated us badly saw the light and finally owned up? But we rarely get that kind of expected result. So sure, e-mail her and say “Hi”.

    Tell her you have been thinking about her and just want to apologize for getting angry and being a coward by walking out on her. But you should remember if she thinks you're apologizing just because you are lonely, she might dismiss your sincerity. Therefore, don't mention that. If she wants to see you again, she'll make sure that happens.

    Even if she doesn't want to be your friend, I can assure you, she'll appreciate the gesture. And it might make you think twice next time you get angry.

Anne

    Killer whales in Alaska's Bering Sea have figured out an easy way to get fed. Instead of seeking out the fish them- selves, the clever whales chase down fishing boats and steal the entire catch of the day, as much as 20,000 to 30,000 pounds.

    Killer whale “thieves” are not a new phenomenon. Japanese fishermen have reported being followed by killer Whales since the 1950s. However, the increasing frequency of whale fish theft in the Bering Sea's continental shelf is now threatening the livelihood of fishermen.

    Paul Clampitt, a local fisherman, says his crew tried to keep the whales away with loud sounds. Though that worked for a short time, the whales now consider the noise “ a dinner bell”. Jay Herbert tried using sonar to keep the whales away. He also met with little success. According to the experienced fisherman, the smart whales deliberately seek out longliners (延绳钓渔船）, and, all the first opportunity presented to them, steal the fish, leaving behind just the lips of the fish caught!

    NOAA Fisheries biologist John Moran is not surprised at the whales' thieving skill. The expert says whales are skilled hunters who can distinguish the sounds of different boats and even recognize the sounds of the operating system that places the fishing equipment into the ocean. The expert jokes, “ Grabbing a fish off a line is nothing.” Since they are social animals, it is easy for whales to pass their skills on to others.

    Killer whales are not the only whale species that have learned to steal from humans. In the Gulf of Alaska, sperm whales also conduct similar thefts. Longline fishermen off Washington, Chile, Australia, Hawaii, and many other countries have reported similar incidents. There is, unfortunately, no easy fix to this problem. One of the possible solutions is using pot traps similar to the ones used to catch crabs. However, the cost of switching from longline to pot fishing is too high, especially for small-scale fisheries. There is also no guarantee that the catch will be safe from the intelligent whales which, many fear, will eventually figure out how to open the pots!

C

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.＂

    Jack Ma, whose Chinese name is Ma Yun, became the richest man in China, when the company he founded floated on the stock market last year with a value of around ￡140 billion. Here are some interesting stories about him.

    ⒈"Beer" was the first word that Jack Ma searched for on the Internet

    In 1995 Ma made his first trip to the US and used the Internet for the first time. After searching for "beer" and then "China", he saw that no results came up relating to China. He decided to set up a Chinese website一the seed for Alibaba had been sown.

    ⒉Jack Ma applied to study at Harvard 10 times and was rejected (拒绝) each time

Ma failed the entry exams for colleges in China three times and was also rejected for many jobs in China, including one at KFC. He was turned down by the Harvard 10 times after applying.

    ⒊Jack Ma learnt English by giving tourists free guides一every day for nine years.

    Limited resources meant it was difficult to learn English when Ma was young. However, he found that he could learn the language by giving tourists free tours around his hometown of Hangzhou一something that he did during his teenage years every morning for nine years. He found everything they said and did was so different from what he had been taught at school and by his parents, which opened his mind.

    ⒋Jack Ma named his company Alibaba because it's a globally known story

Ma simply wanted his company to have a global and interesting name, and realised that Alibaba is a story known across the world and it begins with A, appearing top of lists.

    The company was founded in 1999 and since then has grown from 15 employees to more than 30,000. Ma hopes to keep expanding Alibaba outside of China.

Riding School:

    You can start horse-riding at any age. Choose private or group lessons any weekday. There are 10 kilometers of tracks and paths for leisurely rides across farmland and open country. You will need a riding hat.

    Opening Hours: Monday through Friday: 9:00 a.m.-8:30 p.m. (3:30 p.m. on Saturdays)

    Phone: (412)396-6754 Fax:(412)396-6752

Sailing Club:

   Our Young Sailor's Course leads to the Stage 1 Sailing qualification. You will learn how to sail safely and the course also covers sailing theory and first aid. Have fun with other course members afterwards in the clubroom. There are 10 weekly two-hour lessons.

    Opening Hours: Tuesdays: 6:00 p.m.-8:00 p.m.

    Phone:(412)396-6644    Fax:(412)396-6644

Diving Centre:

    Our experienced instructors offer one-month courses in deep-sea diving for beginners. There are two evening lessons a week, in which you learn to breathe underwater and use the equipment safely. You only need swimming costume and a towel. Reduced rates for couples.

    Opening Hours: Monday and Friday: 6:30 p.m.-8:30 p.m.

    Phone:(412)396-6312    Fax:(412)396-6706

Medical Center:

    The staff of the Medical Center aim to provide convenient and comprehensive medical care to students and staff of the university. The center is well equipped and the staff here are trained to deal with a broad range of medical problems. Both female and male doctors as well as nursing staff are available for consultation. Also, all kinds of medicines are sold here and are cheaper for students than other drugstores.

    Opening Hours: 24 hours from Monday to Sunday

    Phone:(412)396-6649    Fax:(412)396-6648

Water sports Club:

    We use a two-kilometer length of river for speedboat racing, and water-skiing. A beginners' course consists of ten 20-minute lessons. You will learn to handle boats safely and confidently, but must be able to swim. The club is in a convenient central position and is open daily from 9 a.m. to 4 p.m., with lessons all through the day.

    Opening Hours: Monday through Friday: 9:00 a.m.-4:00 p.m.

    Phone:(412)396-6899    Fax:(412)396-6890

    A campaign is being launched to encourage children to surrender 30 minutes of screen time a day to head for the great outdoors.

    The newly formed Wild Network—a collaboration of nearly 400 organizations—is attempting to attract youngsters away from television and computer screens to fields, woods and parks. Members of the network include the National Trust, RSPB, Play England and the NHS. Organizers say it is the UK's biggest ever campaign to reconnect children with nature and outdoor play, and claim it could help improve fitness, mental alertness and general well-being.

    A documentary film, Project Wild Thing, will forecast the launch at more than 50 cinemas across the UK from Friday. It looks at the increasing link between children and nature.

    Andy Simpson, chairman of the Wild Network, said, "The tragic truth is that kids have lost touch with nature and the outdoors in just one generation. Time spent outdoors is decreasing, roaming (漫步) ranges have fallen largely, activity levels are declining and the ability to identify common species has been lost."

    Suggestions on how to get more time in nature include collecting conkers (七叶树果), camping, snail racing, and observing autumn colour on trees.

    From January, the network will aim to make suggestions on how the government can do more to get children muddy and bright-eyed.

    This is not the first time the message of less screen time, more play has been brought up. Children in the 1980s were requested to do the same by the BBC TV series Why Don't You, which somewhat confusingly called on its viewers to "switch off the TV set and go to do something less boring instead".