French surgeons have performed what they said on Wednesday was the world's first partial face transplant— 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 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 the transplant.

It is hardly surprising that clothing manufacturers(生产商) follow certain uniform standards for different features of clothes. What seems strange, however, is that the standard used for women is the opposite of the one for men. Take a look at the way your clothes button. Men's clothes tend to button from the right, and women's from the left. Considering most of the world's population—men and women—are right-handed, the men's standard would appear to make more sense（更有道理） for women. So why do women's clothes button from the left?

    History really seems to matter here. Buttons first appeared only on the clothes of the rich in the 17th century, when rich women were dressed by servants. For the mostly right-handed servants, having women's shirts button from the left would be easier. On the other hand, having men's shirts button from the right made sense, too. Most men dressed themselves, and a sword（剑） drawn from the left with the right hand would be less likely to get caught in the shirt.

    Today women are seldom dressed by servants, but buttoning from the left is still the standard for them. Is it interesting? Actually, a standard, once it is set, resists change. At a time when all women's shirts buttoned from the left, it would have been risky for any single manufacturer to offer women's shirts that buttoned from the right. After all, women had grown so used to shirts which buttoned from the left and would have to develop new habits and skills to switch. Besides, some women might have found it socially awkward to appear in public wearing shirts that buttoned from the right, since anyone who noticed that would believe they were wearing men's shirts.

    There's no doubt that water is vital to any life. About 60 percent of the average adult human body is made of water. This includes most of your brain, heart, lungs, muscles and skin, and even about 30 percent of your bones. Yet there's little scientific agreement about the exact amount of the stuff an individual should consume each day. So how much water do you actually need to drink to be healthy?

    You may have heard that you should drink eight 8-ounce glasses of water a day. Yet, the downside of this rule, researchers say, is that drinking water by the glass is not the only way that humans take in it. The “8 X 8” rule essentially overlooks two big sources of daily water consumption. One such source is food. Everything you eat contains some water. Watermelons, for example, are more than 90 percent water by weight. Different diets naturally contain different amounts of waters, and the counts. The other key water sources are other beverages. Non-alcoholic drinks such as coffee, and tea, contain mostly water and all contribute to your hydration（水量）.

    So, between all the food, water and other fluids you consume in a day, how much water should you aim to take in?

    The National Academics of Sciences suggests that woman consume a total of approximately 2.7 liters (91 ounces) of warm from all beverages and foods each day and men 3.7 liters (125 ounces). But these are just general guidelines.

    The truth is, there is no magic standard for hydration—everyone's need vary depending on their age, weight, level of physical activity, general health and even the climate they live in. The more water you lose, the more water you'll need to replace with food and drink. If you are looking for concrete advice, though, the best place to look is within. Drink up when you're thirsty.

Your 2018 Reading List, Provided by Bill Gates

    Most of us can't live like billionaire Microsoft co-founder Bill Gates, but we can read like him. Gates recommended four books in 2018—though some were published earlier.

    Leonardo da Vinci, by Walter Isaacson (2017)

    The bestselling biographer of Steve Jobs and Albert Einstein researched deeply into da Vinci's contributions beyond art, highlighting the breadth of his scientific, technological, and creative output. “Leonardo nearly understood almost all of what was known on the planet at the time. That's mostly because of his curiosity about every area of natural science and the human experience,” said Gates.

    The Best We Could Do: An Illustrated Memoir, by Thi Bui (2017)

    Gates calls this graphic novel “really impressive”. Bui is the daughter of Vietnamese refugees who came to America after the fall of Saigon, and becoming a parent inspired her to look into her own parents' miserable history. “I was struck by how the experiences Bui illustrates manage to be both universal and specific to their circumstances,” said Gates.

    Lincoln in the Bardo, by George Saunders (2018)

    Saunders, a long-time short story writer, won high praise for this novel. The book imagines the ghosts that haunt (萦绕) the basement of Willie Lincoln, Abraham Lincoln's son, who died at 11 in real life. “Willie's death after the Civil War made the president have a new understanding of the grief he's creating in other families by sending their sons off to die in battle,” said Gates.

Origin Story: A Big History of Everything, by David Christian (2018)

    This new book is by the creator of Big History, a free, online social studies course. It traces history in wide, sweeping movements, starting with the Big Bang, and it provides, in effect, a short course in modern science. This is a brief history of the universe. “David gets a little stuck on the current economic and political problems in the West, and I wish he talked more about the role innovation will play in preventing the worst effects of climate change,” said Gates.

    The Children's Groundwater Festival, first organized by the Groundwater Foundation 19 years ago, is celebrated every year in Nebraska, a state of the central United States in the Great Plains. After organizing the festival for 16 years, the foundation passed the program on to the local community of Grand Island, Nebraska. The festival is an annual event for fourth and fifth graders of Nebraska. It is an interesting and energetic day filled with hands­on education. Water magic, folk singers and musicians, storytellers, and bird shows add to the happy atmosphere during the festival. There are also some educational activities:

    Gooey Garbage: Children build a landfill (废物填埋场) and learn how a properly­built landfill can protect groundwater.

    Water Races: Children learn about water pollution by racing a drop of water through a model.

    Well in a Cup: By building a small aquifer (蓄水层) in a cup, children learn about aquifers and drinking water wells.

    Taster's Choice: Children drink different types of water, from tap water to bottled water. Then they are taught about the treatment process of each type of water.

    There's No New Water: Students are taught to make a special glass container and learn about the water cycle.

    The Children's Groundwater Festival not only has a great influence on Nebraska's people. So far, similar festivals have been held in nearly 40 American states, Mexico City, several provinces in Canada, and New Delhi, India. People everywhere are realizing the importance of educating young people to learn and care about groundwater.

    For more information about this festival, remember to watch our program tomorrow evening. I'll be waiting for you.

Most parents are worried the first time they catch their kids out in a lie. According to child and teen psychiatrist Gayani DeSilva, lying can actually be a sign of healthy development in young children. "Kids lie for many reasons, and much of it is normal," DeSilva says. "People are not born with the knowledge of communicating with others and getting their needs met. They'll experiment with different communication styles and techniques until they find the ones that work best for them. Lying is one of those techniques."

As kids get older, they become more aware of how their actions affect others, and many will lie less frequently. In spite of this, parents still need to Lead their kids to form a habit of not lying. According to DeSilva, when children lie, look at them directly and ask what they need. After they tell you, gently remind them that telling you directly will be more effective than lying.

It's also a good idea to model the behavior you want to see in your kids. In other words, don't lie to your children. This will set you and your children on a course of open communication and trust.In some cases, lying is a sign of a deeper issue. A child who is neglected will lie more than a child who has attentive and responsive parents. He's not sure whether he's loved. He may lie to please others. The same goes for a child who has experienced something unpleasant. He may lie to try to hide his shame, avoid admitting his needs, or to control his surroundings to ensure his safety.

By paying attention to the reasons behind a lie, parents can figure out what need to be done. For example, while Jack might lie about completing his homework in order to play video games, he also might be trying to avoid negative feelings connected with school work, and this is just where parents should start, says therapist Gideon Javna.