A qualified doctor who rarely practiced but instead devoted his life to writing．He once said: “Medicine is my lawful wife, and literature is my lover．” Russian writer Anton Pavlovich Chekhov, was a great playwright and one of the masters of the modern short story．

    When Chekhov entered the Moscow University Medical School in 1879, he started to publish hundreds of comic short stories to support his family．After he graduated, he wrote regularly for a local daily newspaper．

    As a writer he was extremely fast, often producing a short story in an hour or less．Chekhov's medical and science experience can be seen through the indifference (冷漠) many of his characters show to tragic events．In 1892, he became a full time writer and published some of his most memorable stories．

    Chekhov often wrote about the sufferings of life in small town Russia．Tragic events control his characters who are filled with feelings of hopelessness and despair．

    It is often said that nothing happens in Chekhov's stories and plays．He made up for this with his exciting technique for developing drama within his characters．Chekhov's work combined the calm attitude of a scientist and doctor with the sensitivity(敏感) of an artist．

    Some of Chekhov's works were translated into Chinese as early as the 1940s．One of his famous stories, The Man in a Shell, about a school teacher's extraordinarily orderly life, was selected as a text for Chinese senior students．

    Here's an interesting fact: Every teenager American seems to have, at some point, appeared drunk or rude online. This generation didn't invent stupidity, of course; it's just the first to post the picture online the entire world to see. And that's the rub: Employers are getting clever at looking you up online. They look at what people post and wonder. Is that new salesperson, the one who made a strange face on collegehumor.com,likely to do the same at a conference?”

    Anything that you put online is public information. This should seem pretty obvious to the generation who grew up on these sites, right? But it's not. When it comes to the Net, young people tend to fell for two traps. One:“ Many of them believe it's truly private, and they'll determine who gets to sec what, and it will stop there.” Wrong! And two: “Their sense of what things will be like in the next stage of their life is not realistic.”

    So what do you do about that picture? Take it down! But what if it is now on other sites? After all, a friend can post your photo elsewhere, and from there, it can be posted on another site. This problem is so common that a new industry has appeared: identity management, which helps people remove embarrassing material.

    The new industry serves to remind us that we've got to be careful out there. Most of us have got drunk or done something we regret. But putting it online is another matter. And for some, it's even become an addiction, one with a nickname: Crackspace. Young or old, students and managers alike turn into exhibitions, putting every aspect of their lives on public display(展示).

    Yes, it can be great fun. But should those of us posting pictures of ourselves dancing in our underwear be given a good comment? In a forgiving, kindly environment, yes. But what about in a business environment? Well, you decide.

    AlphaGo is a computer program that plays the board game Go.

    In March, 2016, the pride of humankind was crushed (粉碎) by a computer. Google's AlphaGo defeated the South Korean grandmaster (围棋大师) Lee Sedol four games to one, as the world looked on with shock and awe (敬畏). Artificial intelligence (AI, 人工智能) had suddenly reached a new and unexpected height.

    But as smart as AlphaGo is, it's no longer the best Go “player” in the world. Google's artificial intelligence group, DeepMind, has created the next generation of its Go-playing program, called AlphaGo Zero. The new AI program is unique in the way it learned to play Go. Instead of learning from thousands of human matches, as its predecessor (前任) did, AlphaGo Zero mastered Go in just two days without any human knowledge of the game and defeated AlphaGo by day three, reported The Guardian. It then went on to defeat AlphaGo 100 games to zero.

    To learn how to play Go, AlphaGo Zero played millions of matches against itself using only the basic rules of the game to rapidly create its own knowledge of it. Like the previous version, it used “reinforcement (增强) learning to become its own teacher,” according to DeepMind's website.

    “It's more powerful than previous approaches,” David Silver, AlphaGo's lead researcher, told The Guardian, “because by not using human data, or human expertise in any fashion, we've removed the constraints (约束) of human knowledge and it is able to create knowledge itself.”

    AlphaGo Zero's approach to self-learning is a significant advancement in AI that could be applied to help solve some of the world's biggest problems, according to a recent research report published in the journal Nature. For example, DeepMind co-founder Demis Hassabis argues that AlphaGo Zero could probably find cures for a number of serious diseases within weeks, according to The Telegraph. Indeed, the AI is now being used to study protein folding, which is connected to diseases such as Parkinson's and Alzheimer's.

    So now that AI has exceeded (超过) the bounds of human knowledge, perhaps the question is not about what AI can learn from humans, but what humans can learn from AI. We can only wait and see.

    “Sesame Street” has been called “the longest street in the world”. That is because the television program by that name can now be seen in so many parts of the world. That program became one of American's exports soon after it went on the air in New York in 1969.

    In the United States more than six million children watch the program regularly. The viewers include more than half the nation's pre-school children, from every kind of economic, racial, and geographical group.

    Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from “Sesame Street” are in the same class with children who have not watched the program.

    Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional（偶然的）viewers. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly.

    The programs all use songs, stories, jokes, and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters.

    Why has “Sesame Street” been so much more successful than other children's shows? Many reasons have been suggested. People mention the educational theories（理论）of its creators, the support by the government and private（私人的）businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more.

    Why can some people sleep through noises like a honking car or flushing toilet, while others are awakened by the lightest sound?

    To find the answer, sleep researchers at Massachusetts General Hospital conducted an unusual study of 12 self-described deep sleepers. After tests confirmed that the healthy volunteers were solid sleepers, they took part in a three-night study in the university's sleep laboratory. The participants spent the night in a big and comfortable room. But the room also included four speakers positioned near the top of the bed.

    During the night, the deep sleepers were subjected to 14 different recorded sounds, like street traffic, toilets flushing, and an airplane flying overhead. Next door, the researchers monitored their sleep patterns and brain waves.

    As expected, all of the participants slept relatively well, but there were differences in how they responded to the noisy interruptions. Some of the sleepers didn't wake up even when a sound was blasted at 70 decibels（分贝）; others were awakened by sounds at 40 or 50 decibels.

    The researchers discovered that the difference in a sleeper's reaction to noise could be predicted by the level of brain activity called "sleep spindles（纺锤体）". A sleep spindle is a burst of high-frequency brain activity coming from deep inside the brain during sleep. The source of the spindles is the thalamus（丘脑）, a part of the brain that sends sensory information to the rest of the cortex（皮层）.

    Before the study, the Massachusetts researchers theorized that the spindles are the brain's way of preventing sensory information from passing through the thalamus and waking the rest of the brain during sleep. They found that sleepers who experienced the most sleep spindles during the night were also the soundest sleepers and were least likely to be awakened by noise.

    Scientists already know that most people become lighter sleepers with age, most likely because older people experience less "slow wave sleep", which is the deepest stage of sleep. People also produce fewer sleep spindles as they age. But even when controlling for the stage of sleep a person was in, the number of sleep spindles still predicted their risk for awakening because of noise.

    More research is needed, but the findings suggest that a better understanding of sleep spindles could lead to new behavioral or drug therapies for people with sleep disorders. For example, future studies may try to determine whether diet, exercise or other behaviors may influence the number of sleep spindles a person produces during the night.

Summer Holiday Fun 2019!

    The summer holidays are upon us again. Here is our guide to summer holiday fun in Peterborough!

    Peterborough Museum

    The Age of the Dinosaurs is the museum's main attraction this summer. Get up close to prehistoric creatures via some great hands-on exhibits! Watch out for monsters lurking around every ember! The museum is open from 10: 00 a. m. to 5: 00 p. m. Monday to Saturday, and from 12: 00 p. m. to 4: 00 p. m. on Sundays in August.

    Call 01733 864663 for details.

    Saxon Youth Club

    School holiday fun: Young people aged 13-19 will be able to produce their own music, compete in sports activities, or try their hand at cooking at Saxon Youth Club, Saxon Community Centre, Norman Road, Peterborough every Monday and Wednesday from 3: 00 p. m. PLUS an aero ball tournament will take place on Thursday, 12th August between 3:30 pm and 6: 30 p. m.

    Call 01353 720274 for details.

    Houghton Mill

    Through the Looking Glass—a new production of the family favorite on Monday 30th, August. Bring rugs or chairs to sit on and a picnic if you wish to eat during the play. Gates open 5:30 p. m., performance 6: 30 p. m.—8: 30 p. m. Tea room will be open until the end of the interval. Adult ￡10. Child ￡7. Family ￡20.

    Booking advisable on 0845 4505157.

    Farmland Museum and Denny Abbey

    Farmland Games: From Wellie Wanging to Pretend Ploughing matches, come and join the Farmland Team. Collect your sporting stickers and create a colorful rosette that is fit for a winner! No need to book, just turn up between 12: 00 p. m. and 4: 00 p. m. on Thursday, 19th August. Suitable for children aged four and above, each child should be accompanied by an adult and all activities are included in the normal admission price. Tickets Cost: ￡7 per child.

    For further information, call 01223 810080.