French surgeons have performed what they said on Wednesday was the world's first partial face transplant（移植）— giving a new nose, chin and lips to a woman attacked by a dog.

    Specialists from two French hospitals carried out the operation on a 38-year-old woman on Sunday in the northern city of Amiens by taking the face from a brain-dead woman, who had hanged herself just hours before the operation. Her family agreed on the operation.

    “The patient is in an excellent state and the transplant looks normal,” the hospitals said in a brief statement after waiting three days to announce the pioneering surgery.

    The woman had been left without a nose and lips after the dog attacked her last May, and was unable to talk or chew properly. Such injuries are “extremely difficult, if not impossible” to repair using normal surgical techniques, the statement said.

    The statement did not say what the woman would look like when she had fully recovered, but medical experts said she was unlikely to resemble the woman who had been the source of her new face.

    The operation was led by Jean-Michel Dubernard, a specialist from a hospital in Lyon who has also carried out hand transplants.

    Skin transplants have long been used to treat burns and other injuries, but operations around the mouth and nose have been considered very difficult because of the area's high sensitivity（敏感） to foreign tissue.

    Teams in France, the United States and Britain had been developing techniques to make face transplants a reality

    There was a short-term risk for the patient if blood vessels became blocked, a medium-term danger of her body rejecting the new skin and a long-term possibility that the drugs used could cause cancers.

    Experts say that although such medical advances should be celebrated, the transplant had thrown up moral（道德的）and ethical(伦理的)issues. Little is known about the psychological effect of three transplant.

    Last year DeepMind's AlphaGo programme took on and beat two of the world's best players of the Chinese game of Go（围棋）-an unbelievable achievement seen as a milestone in the development of artificial intelligence (A). That programme was trained by first giving it vast amounts of data from amateur and professional games.

    The new AlphaGo Zero began with a blank board and nothing but the rules of Go and set about playing against itself. Within three days it was so advanced that it took on the previous version, which had taken months to develop, and defeated it by a hundred games to zero.

    DeepMind says that creating knowledge from first principles without learning from human expertise（专门技能）is an important step in developing artificial intelligence. The company's founder Demis Hassabis said this breakthrough could help in real world problems such as designing new drugs or discovering new materials.

    In 1997, Garry Kasparov was defeated by Deep Blue, a computer program written by IBM, running on a supercomputer. This was the first time that a ruling world chess champion was defeated by a computer program in tournament conditions. Superficially, AlphaGo's win against Lee Sedol can be compared to Deep Blue's win against Gary Kasparov, which happened almost 20 years ago. So: what's the big deal? We have to understand the differences between chess and Go.

    In chess, each player begins with 16 pieces of six different types. Each piece of type moves differently. The goal of the game is to seize the other player's king. Go starts with an empty board. The goal of the game is to gain as much territory（领地）as possible.

    Although the rules of Go might appear simpler than those of chess, the complexity of Go is higher. Also, games usually last longer for lots of moves. A typical game in Go might last for 150 moves vs.80 in chess.

    Work started this week on next season's flu vaccine (疫苗), with experts working off forecasts about which types of the flu virus will be making the rounds. But don't expect any improvements. Flu experts are already admitting that most vaccines will give at best basic protection, because they're based on old-fashioned technology. It's not a new problem, but one that the slow-moving world of drug and vaccine production seems helpless to improve upon.

    Every flu vaccine is a cocktail, aimed at either three or four of the most common flu types. Flu vaccines must be recreated every year because flu viruses develop constantly in a process called antigenic drift. In February, global flu experts gather to trade notes on what viruses are circulating in different countries and to come to an agreement on which types the next vaccines should be made to target.

    In recent years, flu vaccines have been based on H1N1, H3N2 and either one or two types of influenza B virus. Each of these has a "reference" type, which is used to make seed virus. Producers add the seed types to eggs and incubate (孵) them as the virus grows. Then they purify the virus, and either weaken it or kill it to make a vaccine.

    Using eggs is a tricky (=difficult) and unpredictable process. Sometimes the virus doesn't grow well in eggs, which can mean less vaccine than expected. The result is a flu vaccine that doesn't offer much protection. "As long as we have eggs we are going to have this problem," said Scott Hensley, a flu virus expert, "The only solution is not to depend on eggs."

    Flu is a major killer. The 2017-2018 season has been a severe one, hitting the entire U. S. with widespread influenza infection (感染) at once for weeks on end, and killing 97 children so far. Against this threat, even a less satisfying flu vaccine will definitely help. "Even when you have these mismatches it will not prevent infection but likely prevent disease severity," said Hensley.

    When I was eight, I got my first pair of glasses. Far from being made fun of at school, the only struggle I got was endless requests to try on my new glasses. Hearing about what happened at school, my father once looked at me and asked whether I had pretended to be the blindness just to look like Harry Potter?

    With my strange hair and glasses, I did nothing to avoid it, either. The Harry Potter books were the great pop cultural event of my generation, who began reading again. My school librarian, both confused and annoyed by us Potter fans, dealt with fights over the schools few old copies by setting a new rule: Harry Potter could be borrowed for only three days, instead of the whole week of borrowing period every other title was allowed.

    In the 20 years since the first book arrived on shelves, publishers and parents have been asking what has made J.K. Rowling's books so loved. It is better to look at the influence they have had on their readers. Yes, the books were about a boy taking on a dark and powerful enemy in the magical world, but they were also about love defeating hate, determination and choosing" between what is easy and what is right". Rowling's entire magical characters were all people we want to be.

    I grew up with Harry and together we became children with our own opinions, teens easy to get angry and young adults thinking of everything as normal. When the final book came out in 2007.I read it for 12 hours without a break and cried as I finished it. I felt something sad: the end of Harry's story signaled the end of my childhood. I was suddenly aimless. Meanwhile, my now Potter-mad father walked impatiently nearby, waiting for the proper moment to take the book away from his daughter.

    Harry Potter did shape my generation. As a girl who grew up mostly in peacetime, many of the ideas I found in these books were ones we had never come across before. The magical world's terrible treatment of non-human beings was the first description of slavery I knew. The treatment of Harry's teacher Remus Lupin, who hides his condition at work, is a metaphor(比喻) for the shame surrounding those who suffer from AIDS. And all settings like this may have real-world reflections .A study found that teenage Harry Potter readers showed more tolerance (包容) towards those who were suffering. Is it possible that Jeremy Corbyn's popularity among the young had anything to do with their literary education? Is it possible that Harry Potter, in the 20 years he has been with us, has inspired a generation to be more empathetic （感同身受）， welcoming and socially open－minded than those before it? We will see, if not, at least my glasses are still cool.

    We can make mistakes at any age. Some mistakes we make are about money. But most mistakes are about people. "Did Jerry really care when I broke up with Helen?" "When I got that great job, did Jim, as a friend, really feel good about it?" "And was Paul friendly just because I had a car?" When we look back, doubts like these can make us feel bad. But when we look back, it's too late.

    Why do we go wrong about our friends or our enemies? Sometimes what people say hides their real meaning. And if we don't really listen we miss the feeling behind the words. Suppose someone tells you, "You're a lucky dog." That's being friendly. But "lucky dog"? There's a bit of envy in those words. Maybe he doesn't see it himself. But bringing in the "dog" bit puts you down a little. What he may be saying is that he doesn't think you deserve your luck.

    "Just think of all the things you have to be thankful for" is another noise that says one thing and means another. It could mean that the speaker is trying to get you to see your problem as part of your life as a whole. But is he? Wrapped up in this phrase is the thought that your problem isn't important. It's telling you to think of all the starving people in the world when you haven't got a date for Saturday night.

    How can you tell the real meaning behind someone's words? One way is to take a good look at the person talking. Do his words fit the way he looks? Does what he says agree with the tone of voice? His posture(姿态)? The look in his eyes? Stop and think. The minute you spend thinking about the real meaning of what people say to you may save another mistake.

For about three years now, I have been writing poetry. It was not until my junior year in high school that I developed an interest, love and skill for writing poetry. 

Back in elementary school, I loved to write stories. I would write stories on post-it notes and anywhere I could. Yet when I had to write a limerick(五行打油诗) for an assignment, I could not wrap my head around poetry. I had a very hard time figuring out how to rhyme words and have the words make sense. I eventually tossed the paper with the attempted limerick in the trash. I did not try my hand at poetry again until several years later. 

Many years later in my freshman year of high school, my English teacher gave my class a poetry project as an assignment. I still remember my limerick assignment and was afraid of doing the poetry project. For the project, we had to analyse a poem and write a response to it. I chose to respond to Robert Frost's poem Fire and Ice. I also wrote my own poem first. I became really excited when writing the poem. 

Two years later, I started writing poetry as a hobby and for fun. To learn how good or bad my poems were, I handed them in to some magazines and contests. I won the second place in the North Carolina Poetry Society's Sherry Pruitt Award Contest, and had my two poems published as high quality poems. I have continued to write poetry, and have even self-published three collections of poetry in both print and e-book formats, which can be found in my store on Lulu. 

Now, I love writing poetry, but I don't hate writing short stories. I just find it more difficult and not my style of writing, even though I still write short stories occasionally.