Bursting into the classroom from recess, 15 children take their seats and face the woman they know as Ms. Yang.

    “What day is it today?” she asks, in Mandarin Chinese.

    “Confucius' birthday!” the fifth graders shout in Mandarin.

    “Why do we celebrate Confucius' birthday?”

    “Because he's the greatest teacher in the history of China!” exclaims a brown-haired girl. She is speaking Mandarin.

    English is rarely heard in Lisa Yang's class at the Chinese American International School(CAIS), despite the fact that few students are native speakers of Mandarin.

    The United States is actively trying to increase the group of students in “critical languages” such as Mandarin. The students at CAIS are way ahead in such a trend.

    Founded 25 years ago, this small private school in San Francisco, USA, does what few other American schools do: It produces fully fluent speakers of Mandarin Chinese, by far the most commonly spoken language in the world.

    Mandarin Chinese is suddenly hot in American schools. As China becomes the world's leading economy sometimes this century, schools in the U. S. are scrambling to add Mandarin to their list of foreign languages or expand Chinese programs already in place.

    “It really is almost unprecedented. People are looking at China as a force to be reckoned with… And to ensure that the U. S. has the ability to conduct trade, and to work with the Chinese. Certainly having an understanding of Chinese language and culture is an advantage,” said Marty Abbott of the American Council on the Teaching of Foreign Languages(ACTFL).

    To develop Chinese-language programs has not been smooth. A shortage of trained teachers has made it difficult for some schools to join the race. When schools do get teachers, they often hire them straight from China, and the teachers usually suffer culture shock when they come to the U. S.

    Robert Liu remembers his first two years in an American classroom It was not an easy adjustment. “In China, students respect their teachers,” he said. Liu found that American students, however, expect an active teaching style. He had to use games to engage them rather than lectures.

    To avoid many of the problems with foreign teaching styles, the CAIS has been working with the Chinese government to improve training of teachers who are sent to the U. S.

    World Expo 2010 will be held in Shanghai. It will last from May 1st to October 31st, 2010. The Expo site covers a total area of 5.28 km². It spans(横跨) both sides of the Huangpu River, with 3.93 km² in Pudong and 1.35 km² in Puxi. There are five functional zones marked A, B, C, D and E. Each of them has different functions.

    Zone A will host the national pavilions(国家馆) of Asian countries except southeast Asian ones.

    Zone B will be home to the China Pavilion(中国馆) and Oceania (大洋洲的) countries, Pavilions for International Organizations, Theme Pavilions(主题馆), Expo Centre, and Performance Centre etc.

    Zone C will host the national pavilions of European, American and African countries. A large public amusement park will be built at the entrance of this zone.

    Zone D is home to Corporate Pavilions(企业馆), the land is one of the original places of modern China's national industry. So some of the old industrial buildings will be kept and renovated(修复) into Expo pavilions.

    Zone E will host stand-alone(独立的) Corporate Pavilions, Urban Civilization Pavilion (城市文明馆), and Urban Best Practices Area.

    Are you so sure your mistakes are just mistakes? Or could they be building blocks to a success beyond any you imagined?

    When my friend Dorothy goes home to visit her family each Thanksgiving, her mother serves the traditional “mistake salad”. The dish was born many years ago, Dorothy explains, when mother was using a cookbook to make a salad. In the process, by mistake, mother included half the salad ingredients (原料) from a recipe (食谱) on the left side of the open cookbook, and half the ingredients from a different salad recipe on the opposite page. Everyone enjoyed the salad so much that she continued to serve it every year. So it was really not a mistake at all.

    Then there was the man named Alfred, who invented dynamite (炸药). When Alfred's brother died, the city newspaper mistook his brother for him, saying in the news that the dead's most famous act was the creation of bombs (炸弹). Surprised to consider that his name would forever be connected with destruction, Alfred wanted to leave a more positive impression on people. So he set a prize for people who made contributions to world peace. Now the Nobel Prize, set up by Alfred Nobel, is the most respected prize in the world.

    Everything is part of something bigger, and so are mistakes. In his brilliant book Illusions, Richard Bach explains that every problem comes to you with a gift. If you only fix your attention on what went wrong, you miss the gift. If you are willing to look deeper and ask for the bright, the problem will disappear. You are left only with the learning, and you go forward on your path.

    The search engine Google celebrated on Thursday the 110th birthday of the first Native American woman engineer. Google honored Mary Ross with a special Google Doodle on its homepage.

    Ross was born on August 9, 1908, in the state of Oklahoma. She was the great-granddaughter of John Ross, the longest—serving chief of the Cherokee Nation. Her work is considered important to the early stages of the age of space travel.

    Ross showed special abilities in math and science from an early age. As a student, she developed an interest in aviation, or the practice of flying aircraft. She went on to earn a master's degree in mathematics from Colorado State Teachers College, now called the University of Northern Colorado.

    During World War II, Ross began working for the Lockheed Aircraft Corporation as a mathematician. She earned a special certification in the field from the University of California in1949.Ross was later chosen to join Lockheed's top—secret Skunk Works team that worked on aircraft designs. The name refers to a group that is permitted to work independently on advanced projects. She was the only female engineer among the team's 40 members.

    Early on, she researched defense systems. By the late 1950s, her work centered on satellites and a series of space rockets called Agenda. The rockets were extremely important in the 1960s during the Apollo moon program.

    Ross also helped develop early design ideas for space travel between planets, including flyby space flights to study Venus and Mars. Ross retired from Lockheed in 1973.But she continued to give talks at high schools and colleges to encourage more women and Native Americans to study engineering. She died in 2008, a few months before her 100th birthday.

    Many celebrated Ross' life on social media. Twitter user Aaron Perez, for example, wrote: “Mary Ross was an engineer who pioneered in the field of satellites. I never would have known if it wasn't for the doodle. Women engineers deserve more recognition.”

    Have you ever thought of quitting your job when you feel exhausted? Maybe most of you would say "yes". After a particularly busy period at work, I decided to get away from it all by going on a hike in the mountains in southern France.

    Before I left, I read an interesting story in a magazine. It read, "Once, while I was riding on a crowded bus, the man sitting next to me threw his cell phone out of the window when his phone rang. I was surprised. He looked at me, shrugged (耸耸肩) and looked away. I had no idea whether it was his or stolen or whether he even knew what a cell phone was or not, but he clearly wanted to be free of it, because it clearly troubled him."

    Billions of people across the world use cell phones. Though cell phones are a wonderful way for communication, they often do the exact opposite. Using cell phones can increase stress within families and friends.

    So when I recently returned home, I got rid of my cell phone. Now I go outside without taking my phone with me. I've noticed things in my neighborhood I never noticed before, such as gardens. I've met new people, started conversations with neighbors I didn't speak to before and talked with some of my friends face to face instead of chatting over the phone.

    Instead of keeping me off from the world, stopping using my cell phone has helped me get even closer to my family and friends.

    Donna Strickland is a professor in the Department of Physics and Astronomy. Professor Strickland is one of the recipients(受领者) of the Nobel Prize in Physics 2018 with Gérard Mourou, her PhD supervisor at the time. They published this Nobel-winning research in 1985 when Strickland was a PhD student at the University of Rochester in New York state. Together they paved the way toward the most intense laser pulses ever created.

    Professor Donna Strickland is only the third woman ever to have won a Nobel Prize in physics. She and her fellow winners were honored for what the Nobel Committee called ground-breaking inventions in laser physics. Professor Strickland devised a way to use lasers as very precise drilling or cutting tools. Millions of eye operations are performed every year with these sharpest of laser beams.

    "How surprising do you think it is that you're the third woman to win this prize?"

"Well, that is surprising, isn't it? I think that's the story of Maria that people want to talk about — that why should it take 60 years? There are so many women out there doing fantastic research, so why does it take so long to get recognized?"

    Physics still has one of the largest gender gaps in science. One recent study concluded that at the current rates it would be more than two centuries until there were equal numbers of senior male and female researchers in the field.

    The last woman to win a physics Nobel was German-born Maria Goeppert-Mayer for her discoveries about the nuclei of atoms. Before that it was Marie Curie, who shared the 1903 prize with her husband, Pierre. This year's winners hope that breaking this half century hiatus will mean the focus in future will be on the research, rather than the gender of the researcher.