A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

    “It's extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components.“The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.

    They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it's connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.

    While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers' fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.

    Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”

    Traditionally, across the world, boys and girls attend a mixed school, where they study together. But boys' schools are the perfect place to teach young men to express their emotions (情感) and encourage them to take part in activities such as art, dance and music.

    Boys at single-sex schools were said to be more likely to take part in cultural and artistic activities that helped develop their emotional expressiveness, rather than feeling they had to correspond to(和…相符) the "boy code" of hiding their emotions to be a "real man".

    The findings of the study go against accepted wisdom that boys do better when taught together with girls.

    Tony Little, head master of Eton, warned that boys were being failed by the British education system because it had become too focused on girls. He criticized teachers for failing to recognize that boys are actually more emotional than girls.

    The research argued that boys often perform badly in mixed schools because they become discouraged when girls do better earlier in speaking and reading skills.

    But in single-sex schools teachers can tailor (量身定做) lessons to boys' learning style, letting them move around the classroom and getting them to compete in teams to prevent boredom, wrote the study's author, Abigail James, of the University of Virginia.

    Teachers could encourage boys to enjoy reading and writing with "boy-focused" approaches such as themes and characters that appeal to them. Because boys generally have more acute vision, learn best through touch, and are physically more active, they need to be given "hands-on" lessons where they are allowed to walk around. "Boys in mixed schools view classical music as feminine（女性的） and prefer the modern genre （类型） in which violence and sexism are major themes," James wrote.

    Single-sex education also made it less likely that boys would feel that they had to be "masterful and in charge" in relationships. "In mixed schools, boys feel forced to act like men before they understand themselves well enough to know what that means," the study reported.

    It's such a happy-looking library, painted yellow, decorated with palm-tree stickers and sheltered from the Florida sun by its own roof. About the size of a microwave oven, it's pedestrian-friendly, too, waiting for book lovers next to a sidewalk in Palm Beach country Estates, along the northern boundary of Palm Beach Gardens.

    It's a library built with love.

  A year ago, shortly after Janey Henriksen saw a Brian Williams report about the Little Free Library organization, a Wisconsin-based nonprofit that aims to promote literacy and build a sense of community in a neighborhood by making books freely available, she announced to her family of four, “That's what we're going to do for our spring break!”

    Son Austin, now a 10th-grader, didn't see the point of building a library that resembles a mailbox. But Janey insisted, and husband Peter unwillingly got to work. The 51-year-old owner of a ship supply company modified a small wooden house that he'd built years earlier for daughter Abbie's toy horses, and made a door of glass.

    After adding the library's final touches (装点), the family hung a signboard on the front, instructing users to “take a book, return a book,” and making the Henriksen library, now one of several hundred like it nationwide and among more than 2,500 in the world, the only Little Free Library in Palm Beach County.

    They stocked it with 20 or so books they'd already read, a mix of science fiction, reference titles, novels and kids' favorites. “I told them, keep in mind that you might not see it again,” said Janey, a stay-at-home mom.

    Since then, the collection keeps replenishing (补充) itself, thanks to ongoing donations from borrowers. The library now gets an average of five visits a day.

    The project's best payoff, says Peter, are the thank-you notes left behind. “We had no idea in the beginning that it would be so popular.”  (317 words)

    It's AOL Jobs Week. We'll have many job listings, so settle in and get your resume ready. And be sure to check out the rest of our Jobs Week content: from resume writing and networking to day jobs and time management to getting a new restaurant off the ground. Lastly, don't forget to enter our sweepstakes (抽奖) for a chance to win a personal session with one of our career experts!

    Customer Service Workers

    Median salary: US$31,547

    Top cities for hiring: Houston, Texas; Chicago, Illinois; Atlanta, Georgia

    We've all dealt with customer service representatives, those disembodied voices (不见其人的说话声) helping you over the phone with various company or purchase - related matters. Love them or hate them, the customer service field is currently blowing up in the United States - big time.

    Warehouse Workers

    Median salary: US$29,357

    Top cities for hiring: Houston, Texas; Chicago, Illinois; Columbus, Ohio

    Without warehouse workers, everything we've ever purchased would still be sitting in a building somewhere. The rise of online shopping sites like Amazon has made warehouses a hot spot for hiring.

    Accountants

    Median salary: US$63,550

    Top cities for hiring: Chicago, Illinois; Houston, Texas; New York

    Death and taxes may be two reasons for the popularity of accounting jobs, which are frequently in high demand. You'll need to become a CPA (Certified Public Accountant 注册会计师) to get started. But while some jobs are at the mercy of the economy, the economy itself isn't going away. Neither are accountants.

    Human Resources Managers

    Median salary: US$99,720

    Top cities for hiring: Chicago, Illinois; Houston, Texas; New York

    Speaking of job security, workers in company's human resources department are always needed to find and assess new hires, along with countless other tasks essential to keeping a company well- peopled. CareeiCast named it one of the ten best jobs of 2016, because it has high income and low stress.

    A person's nose is important for breathing and smelling. The nose is also used in many popular expressions. Some people are able to "lead other people by the nose". For example, if a wife "leads her husband by the nose", she makes him do whatever she wants him to do. Some people are said to be "hard-nosed". They will not change their opinions or positions on anything. If someone is "hard-nosed", chances are that he will never "pay through the nose", or pay too much money, for an object or service.

    It is always helpful when people "keep their noses out of other people's business"—they do not interfere. The opposite of this is someone who "noses around all the time". This kind of person is interested in other people's private matters. He is considered "nosey". Someone who "keeps his nose to the grindstone "works very hard. This can help a worker "keep his nose clean" or stay out of trouble.

    One unusual expression is "it is no skin off my nose". This means that a situation does not affect or concern me. We also say that sometimes a person "cuts off his nose to spite his face". That is, he makes a situation worse for himself by doing something foolish because he is angry. More problems can develop if a person "looks down his nose" at someone or something. The person acts like something is unimportant or worthless. This person might also "turn his nose up" at something that he considers not good enough. This person thinks he is better than everyone else. He is "with his nose in the air".

    In school, some students "thumb their noses" at their teacher—they refuse to obey orders or do any work. Maybe these students do not know the correct answers. My mother always told me, if you study hard, the answers should be "right under your nose" or easily seen.

    Kulangsu Gallery of Foreign Artefacts from the Palace Museum Collection

    Location: Kulangsu, Xiamen, Fujian Province

    Dates: May 13, 2018 through September 24, 2018

    The gallery is a major place for the Palace Museum to showcase its splendid collection of international art. Most of these works have been kept in the storehouse of the museum and have never been shown to the public. Originally from Europe, East Asia, and North America, these international works date from the sixteenth to the twentieth century.

    Exhibition Commemorating the 120^th Anniversary of Zhang Boju's Birth

    Location: Hall of Martial Valor (Wuying dian)

    Dates: April 3, 2018 through May 6, 2018

    The exhibition features traditional Chinese paintings and calligraphy from state-owned museums. Divided into three sections, the exhibition displays artwork organized in order of time, which offers a comprehensive overview of Zhang Boju's collection through this impressive gathering of the collector's works.

    Discovering the Hall of Mental Cultivation

    Location: The Gate of the Correct Department (Duan men)

    Dates: April 3, 2018 through April 24, 2018

    The exhibition allows visitors new ways to explore the history of the forbidden city with a simple click and celebrates the 92^nd anniversary of the establishment of the Palace Museum, established on October 10, 1925. Adding to the museum's new displays, this exhibition combines traditional Chinese culture and contemporary technologies.

    Treasures from the Al Thani Collection

    Location: The Meridian Gate (Wu men)

    Dates: April 17, 2018 through July 18, 2018

    The Al Thani Collection allows visitors to see cultural landscapes that have been lost in the depths of history. Artefacts from Egypt and Persia throw light on mysteries known to few. Different peoples have marked these relics with their own styles, which reflect the unique sources of each culture but strike the viewers with an equally powerful charm.