Hummingbirds(蜂鸟) are one of nature's most energetic fliers and the only birds to hover(盘旋) in the air by relying on their strength alone.

    Now scientists have found that it is the ratio(比值) of the bird's wing length to its width that makes them so efficient. The discovery is helping experts compete with 42 million years of natural selection to build helicopters that are increasingly efficient.

    David Lentink, an assistant professor at Stanford University in California, tested wings from 12 different species of hummingbirds, which he sourced from museums. He placed them on a machine used to test the aerodynamics(气力学) of the helicopter blades(桨叶). Professor Lentink's team used the same machine to test the blades from an advanced micro-helicopter used by the UK's army. They found that the micro-helicopter's blades are as efficient at hovering as the average hummingbirds.

    But while the micro-helicopter's blades kept pace with the average hummingbird wings, they could not keep up with the most efficient hummingbird's wing. The wings of Anna's hummingbird were found to be about 27 percent more efficient than the man-made micro- helicopter's blades.

    While Professor Lentink wasn't surprised at nature's superiority, he said that helicopter blades have come a long way. “The technology is at the level of an average hummingbird,” he said. “A helicopter is really the most efficient hovering device that we can build. The best hummingbirds are still better, but I think it's amazing that we're getting closer. It's not easy to match their performance, but if we build better wings with better shapes, we might match hummingbirds.”

    Professor Lentink said that we don't know how hummingbirds maintain their flight in a strong wind, how they navigate(确定方向) through branches, or how they change direction so quickly. He thinks that great steps could be made by studying wing aspect ratios-the ratio of wing length to wing width. Understanding these abilities and characteristics could be a benefit for robotics and will be the focus of future experiments.

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    It's generally believed that people act the way they do because of their personalities and attitudes. They recycle their garbage because they care about the environment. They pay $5 for a caramel brulee latte because they like expensive coffee drinks.

    It's undeniable that behavior comes from our inner dispositions(性情), but in many instances we also draw inferences about who we are, as suggested by the social psychologist Daryl Bern, by observing our own behavior. We can be strangers to ourselves. If we knew our own minds, why should we need to guess what our preferences are from our behavior? If our minds were an open book, we would know exactly how much we care about the environment or like lattes. Actually, we often need to look to our behavior to figure out who we are.

    Moreover, we don't just use our behavior to learn about our particular types of character — we infer characters that weren't there before. Our behavior is often shaped by little pressures around us, which we fail to recognize. Maybe we recycle because our wives and neighbors would disapprove if we didn't. Maybe we buy lattes in order to impress the people around us. We should not mistakenly believe that we always behave as a result of some inner disposition.

    Whatever pressures there can be or inferences one can make, people become what they do, though it may not be in compliance(符合) with their true desires. Therefore, we should all bear in mind Kurt Vonnegut's advice: “We are what we pretend to be, so we must be careful about what we pretend to be.”

    Like many other of our lives today, education has become a global enterprise. In microcosm（微观世界）, my school is proof of how global. Monkseaton High School is an ordinary state-funded school of 850 students in the unfashionable part of northeastern England. Over the past seven years it has sent 12 students to American universities — two of them to Harvard. Monkseaton has, in turn, attracted students from other countries, including Germany and Latvia. Monkseaton now almost routinely receives inquiries from students in Eastern European countries. Obviously, learning English is a big draw, but his pattern ofstudent movement was unheard of five years ago.

    The brain drain is a universal phenomenon, and countries that don't face up to the new reality will be losing some of their most precious resources. The northeast of England is its poorest region, and has experienced a severe loss of highly qualified professionals-to-be. Some of the most able 18-year-olds are going to other parts of Britain, even to other countries. What is happening here is happening to Britain as a whole. Most noticeably, there is a growing trend of British students taking degrees in American universities. This year the number will break the psychological barrier of 1,000 students for the first time.

    And what is happening at the secondary-school level is happening to higher education. Wherever they come from, today's students have a very different perspective on education from their parents. Because of television, the Internet and their travels, these students see the world as a much smaller place than their parents once did. They are more confident in accepting the challenge of moving from one country to another, from one culture to another; in many cases they can even apply to schools over the Internet. Students are also more aware of the overall cost of education and are looking for value for money. Plus, for many, education linked to travel is a better option than education at home.

    If you want to get something done, you might want to put your mobile phone back in your pocket. Researchers have found that the mere presence of a phone is distracting (分心) — even if it is not your own. And the devices (设备) are likely to distract you, even if they are not ringing or “pinging” with text messages. People asked to carry out electronic tests of their attention spans were found to perform worse when a mobile phone was present than other people performing in the presence of a paper notepad.

    Scientists from Hokkaido University in Japan said that their findings show that it is harder to concentrate when one of the electronic devices is present. The effect was most marked on people who are not regular users of phones. In tests on 40 undergraduates. Associate Professor Junichiro Kawahara and a colleague divided the subjects into two groups — one asked to carry out tests in the presence of an Apple iPhone next to a computer monitor, and the other in the presence of a notebook.

    The test involved asking the participant to search for a particular character among a mess of other characters on the screen. Researchers measured the time it took to find the target. The results of the experiment found that those with the mobile phone took longer to find the character, indicating that participants were automatically distracted by the presence of the phone. The researchers suggest that people are drawn to the presence of a mobile phone, although there are individual differences in how one attempts to ignore it. In conclusion. Professor Kawahara said. “The mere presence of a mobile phone was a distraction among infrequent internet users.”

    Another finding is that listening to one half of a mobile phone conversation also distracts people, and other studies have found that placing a mobile phone in view has a negative impact on the quality of face-to-face communications. Holding a mobile phone makes you less likely to get a fair hearing from others.

    The theatre in Shakespeare's time was much different than it is today. Authors wrote plays for the masses, especially those who couldn't read or write.

    The theatre changed a lot during Shakespeare's lifetime. The authorities didn't like it and didn't allow acting in the city itself: They thought it had a bad influence on people and kept them from going to church. Queen Elizabeth, on the other hand, loved acting and helped the theatre become popular.

    The theatre in Shakespeare's time was full of life. People did not sit all the time and it was not quiet during the performance. The audience could walk around, eat and drink during the play.

    Theaters were open arenas or playhouses that had room for up to three thousand people. There was almost no scenery because the dialogue was the most important part of the play. Colourful and well-designed costumes were very important and told the people about the status of a character. Women never performed in plays, 80 young boys played female characters. The performances took place in the afternoon because it was too dark at night.

    There was no stage crew as there is today. Actors had to do everything themselves-from making costumes to setting the stage. Plays were organized by acting companies. They performed about 6 different plays each week because they needed money to survive. They had almost no time to rehearse (排练).

    The companies in Shakespeare's time had a rank system. The company belonged to shareholders and managers. They were responsible for everything and got most of the money when the company was successful. Sometimes they even owned their own buildings. Actors worked for the managers and after some time became a permanent member of the company. Apprentices (学徒) were young boys and were allowed to act in unimportant role. They also played female characters in plays.

Max Du emerged victorious at the Canada-Wide Science Fair with an innovative project that could revolutionize emergency response: a drone designed to assist individuals experiencing cardiac arrest. His creative spark was ignited during the Christmas break of the previous year when he received a toy drone from his parents. Due to the snowy conditions, Max was unable to fly his new gadget outdoors, prompting him to explore its potential as an indoor robot that could be of service to people in need.

In Canada, approximately 35,000 individuals suffer from cardiac arrests annually, with the majority of these incidents occurring outside of hospital settings. Sadly, less than 10 percent of these individuals survive. Max was convinced that a drone could provide more rapid assistance and deliver life-saving medication, but he knew he had to construct one himself to validate his hypothesis.

The process of testing his drone spanned six months, during which Max's parents had to tolerate their son's persistent drone flights and mishaps within their home. Each innovative feature Max developed, such as a deployable arm, added weight to the drone, causing it to disintegrate. This necessitated the purchase of new components. Through experimentation, Max eventually discovered a more lightweight material, leading to a better-balanced design.

After a series of trials and adjustments, the 14-year-old successfully perfected his drone. It is now capable of opening door handles, navigating through the air, and landing gently on the ground. The drone features a new extendable arm designed to administer injections or deliver crucial medication to a patient. Additionally, an integrated camera allows for direct communication with an emergency response team, enabling remote monitoring of the patient.

Max is looking forward to filing for a patent to establish connections within the healthcare sector and bring his invention to fruition. He spent his summer acquiring knowledge in artificial intelligence at Stanford University in California, where he was one of only 32 students chosen globally. Following this, he will attend the University of Pennsylvania to enroll in a college-level robotics course before resuming his high school studies in September.