For a 400-year-old art form, opera had a bad fame: overweight actresses singing the words which were hard to understand in one of those romance languages you were supposed to learn in high school. And with tickets costing as much as＄145 a performance, opera goers also had a certain appearance in people's mind: rich, well-dressed and old.

    But now opera companies around the country are loosening their ties and kicking off their shoes in an attempt to keep opera alive and take it to a younger and not so wealthy audience.

    Opera producers have found that to attract this crowd, they need to associate opera with common people. Because young people don't or won't come to the opera, companies are bringing the opera to them, giving performances in such unusual places as parks, libraries and public schools.

    The Houston Grand Opera's choice is the public library, where it performs “mobile operas”, shortened version(剧本) of child-friendly operas. This summer's production is Hansel &Gretel. By performing smaller versions of large productions, producers are able to make people interested while keeping costs at a reasonable level. The San Francisco Opera, which will be celebrating its 75^th anniversary this year, is staging Cinderella free of charge, keeping costs down by employing students from its Young Artists' Training Program.

    Lights out, phones on. Many teenagers reach for their smartphones or tablets at bedtime, but it may be a good idea to switch off before you hit the pillow.

    According to a study by researchers at Murdoch and Griffith Universities in Australia, using mobile devices late at night could harm teenagers' sleep and lead to an increased risk of mental health problems.

    The study was carried out on more than 1,000 Australian high school students aged between 13 and 16. It lasted four years as student participants moved from Year 8 to Year 11.

    During the study, students were asked what time of the night they received or sent text messages and phone calls, and how well they slept.

    The results are impressive. When the study started in Year 8, more than 85 percent of the students had a mobile pone and around one-third of these students never used phones after lights out. In contrast, 93 percent of Year 11 students had a mobile phone and only 22 percent of then had no late night mobile use when the study concluded four years later.

    As the levels of mobile phone use increased, there was a growth in poor sleep behavior among the students. Meanwhile, mental health problems also increased. Students in Year 8 who were more likely to use phones at night were found to have higher levels of depression (抑郁) and lower self-esteem (自尊心) one year later.

    Lynette Vernon, lead author of the study, explained that phones affect our sleep patterns because of the unnatural blue light they produce. This light could affect the level of hormones (荷尔蒙) in the body, disrupting (打乱) its balance.

     “The more you sit in bed and watch TV, play with your tablet, and play with your phone at three o'clock in the morning, the more these things affect the slow waves of your sleep pattern and give your poor quality sleep,” Mark Levi, a Sydney-based sleep doctor said.

    Based on the findings, the researchers suggested parents should focus on guiding their children's use of mobile devices.

    According to Vernon, the solution is not simply to ban teenagers from using their devices, but teach them better ways of using them

     “Back when they're aged 7 to 10, you have to be a role model. If you put your phone away at night and it doesn't go into your bedroom, it becomes normalizedin the household and you have a much easier job,” he told The Guardian.

    Asking a patient to hum(哼唱)piano tunes and play fin instrument while undergoing brain surgery(手术)may sound like a strange request from a doctor．However，that is exactly what a team of brain specialists，led by Pilcher，requested Dan Fabbio to do．

    In 2015，the then 25-year-old musician was diagnosed with a brain tumor(肿瘤)，which was located in the part of the brain known to be active when people listen to and make music．“Removing a tumor from the brain can have significant consequences depending on its location，”Pilcher says．“Both the tumor and the operation can damage tissue and affect communication between different parts of the brain．”

    Fabbio，therefore，feared the surgery would cause him to lose his musical ability．To prevent that from happening，Pilcher and his colleague designed many tests，including asking Fabbio to listen to piano tunes and hum back during MRI scans．This enabled the physicians to locate the area that is vital for music and language processing and create a 3-D map of Fabbio's brain．

    Despite the great starting point，it was not a perfect way to prevent possible damage to the．The only way was to keep the patient awake and ask him to hum piano tunes during the surgery so that the surgeons could identify the areas to avoid．While the surgery went smoothly，the real test came when Fabbio was asked to play a song on his saxophone．The tunehad been simplified to ensure that it would not require too much strength and cause harm to the stitches(缝线)in the brain．He played it faultlessly，and when he finished，the entire operating room erupted in applause．

    The researchers say that a year after the groundbreaking surgery，the young musician can once again hear tunes in everything—even his electric toothbrush．

    This is not a diet. It's a simple way to lose weight. You don't have to give up the food you love or join a gym. You just follow some habits thin people have. Keep them, and you'll become thin.

    Wake-up When you wake up in the morning, sit up slowly without using your hands. With legs straight out, lean forward(前俯) until you feel sore(酸痛的) in your back. It will use up 10 calories.

    Start with soup Order a clear soup, and have it before the main food. In this way, you'll feel fuller, so you'll eat less when the main food comes.

    An apple or more a day Apples are full of fiber(纤维) and water, so your stomach will want less. Studies show that people who eat at least three apples or pears a day may lose weight.

    Talk it up Every time you use the cell phone, stand up and walk around. Heavy people sit on average two and a half hours more each day than thin people. This skill is very important as standing up and walking around will burn up 50 or more calories.

    Use these skills, and you will have a big weight loss.

    A student is learning to speak British English. He wonders: Can I communicate with Americans? Can they understand me? Learners of English often ask: What are the differences between British and American English? How important are these differences?

    Certainly, there are some differences between British and American English. There are a few differences in grammar. For example, speakers of British English say "in hospital" and "Have you a pen?" Americans say "in the hospital" and 'Do you have a pen?' Pronunciation is sometimes different. Americans usually sound theirs in words like "bird" and "hurt". Speakers of British English do not sound theirs in these words. There are differences between British and American English in spelling and vocabulary. For example, "colour" and "honour" are British, "color" and "honor" are American.

    These differences in grammar, pronunciation, spelling and vocabulary are not important, however. For the most part, British and American English are the same language.

    Nasr Majid started hunting this fall at Blackwater National Wildlife Refuge (保护区)on the Eastern Shore of Maryland in USA, He's one of the relatively few new hunters who officials hope will help stop a nearly four-decade decline nationally in what has become a hobby for fewer than 5 percent of Americans.

    Natural resources and wildlife, officials in Maryland are encouraging hunting of deer, turkeys and some other wild animals, which is believed to be good for the environment. Without hunting, they say, sika deer will overpopulate the wildlife refuge and they'll overeat the bushes and other plants that provide important habitat for birds. On the western shore of the Chesapeake Bay, hunting is also important to prevent the spread of diseases such as Lyme.

    In many families, the hunting tradition has been handed down for generations^ But as longtime sportsmen age and children lose interest, the number of hunters in the United States fell by 2 million, from 2011 to 2018, to about 11 million.

    "Everything is changing. Kids are growing up in front of video games and computers instead of going hunting." said Chris Markin, a hunting specialist for the state natural resources department. "Adults usually focus on working and providing for their families. Those pressures are preventing many other potential hunters from going out, and from raising the next generation of hunters."

    To avoid such a decline, a new approach is needed. Government agencies and nonprofit groups are now launching mentoring (指导) programs to train more hunters, which not only helps preserve an industry and a culture but also means more protection for wildlife and their habitats through deer population control and investment.

    Luckily, there are those still eager to learn, like Majid. He was just looking for an outdoor hobby he could share with his children when he came across the mentors-hip program. Now, he feels capable of hunting on his own, but also has someone he can text with questions that pop up. His new pastime has already paid off for him—on his second hunt with his mentor, in the last minutes of daylight, he bagged his first deer.