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.”

New York City Tour Guide

CENTRAL PARK PHOTO TOUR $79

With Sam L.

    Come to shoot in the Central Park of New York that will allow you to take home digital postcards. This tour is a great introduction to Central Park and combines views of the bridges, lakes and skyline.

    At each stop of the photo tour, I will provide you with explanations around photography(摄影)，camera settings etc. You will be able to put these tips to good use immediately.

NEW YORK RUNMNG TOUR $50

With Sebastien B.

    Love running? Love New York? Do you want to see the sites of the city? Contact me and we'll take a special tour. All you'll need to do is to put on your sports shoes and we'll be off. I'll show you my favorite running spots along the Hudson River or north of Central Park and away from all the tourists.

    If you re thinking of training for something, I'll give you the explanations and tips to make the best of your time training!

GREENWICH VILLAGE FOOD TOUR $75

With Manhattan W.

    Discover unbelievable places to eat. This is the real Greenwich Village gastronomic(美食的) experience. Along the way, find out how the village has kept its unique character throughout the years, from the Dutch and English controlled periods to today.

Tour runs every day from 12:30 PM—2:30 PM.

NEW YORK BY NIGHT PHOTO TOUR $115

With Sam L.

    We have already prepared NYC for the most unique points for you. During the -hour walking tour, we share these special comers of NYC.

    The night tour teaches night photography techniques while discovering the “darker” side of the city that never sleeps： the UN headquarters, 42nd street, Grand Central Terminal, the Chrysler Building, Rockefeller Center and Radio City Music Hall.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Some international languages are widely used for many purposes. Some minority languages will die out and some nations tend to keep minority languages. I reckon that most common used international languages ease our life quality and communication with different nationalities. On the other hand, we need to help improve minority languages.

    There are many languages in the entire world but two or three minority languages die out each year. Some countries try to save dying languages. For instance, Australian Government created a project to save the language and culture of Maori who are Australian aborigines. And there are other projects to keep minority languages such as American Indian language.

    However, the worldwide job market usually requires candidates who can speak English or other international languages. People who cannot speak lingua franca (共通语) could hardly be promoted at work. For example, some companies need an employee who can deal with foreign companies. So most people tend to learn at least one international language that helps them to find a better job.

    Therefore, world needs one common lingua franca that should be spoken in any country. Consequently, one common language should be a required subject in every school. So anyone speaking one common language can travel without worries to any point of the world and trade their products. People will not be forced to learn many languages.

    In conclusion, we should help minority nations to keep their languages for the cultural diversity. To ease the worldwide communication among nations, we should create a common language and provide courses of it. As a result, no one will face a language issue.

    Believe it or not, we all have an inner-child living inside of us. One of the greatest problems is people's desire to silence the inner-child. Instead, welcoming this voice to the conversation can be very beneficial and help you in many areas of your life.

    Why is it so important to listen to your inner child?

    Do you remember you wanted to be an adult more than anything else when you were young? But now you're an adult, and do you ever find yourself thinking, "I wish I were a kid again?" That's where your inner-child comes in. That's the voice inside of you telling you to have fun, be silly and let loose. Adult life is full of important responsibilities, but once in a while you just have to let go and have fun like a child. It's healthy and good for the soul to not take things so seriously all the time.

    We can tell bad choices and mistakes of the past, but unless you help your inner-child heal and recover, planning for the future will always be difficult. The inner-child will relive these painful experiences until you learn to accept them, forgive and let go. We must show love and acceptance to our inner-child, as this is the only way to heal, move on and not continue to suffer from the pain of these unpleasant times. This is the opportunity to go back in time and let you know just how wonderful, beautiful and special you truly are.

    One of the most common times your inner-child is likely to appear is when you're facing a decision you are unsure about. Naturally, when we were children, doubt and uncertainty scared many of us. So, it's no surprise that when faced with these moments as adults, the inner-child decides to show up. Don't let this scare you; instead, listen to that voice as it is trying to guide you in the decision-making process. Ask it questions, speak with it.

    When you can start to see your inner-child as your partner who helps guide you through this crazy life, it's amazing what can happen. Don't fight it. Go with it and see how it changes your life for the better.

    How often do you exercise? A new study found that most kids aged 12 to 15 weren't getting enough physical activity. The results were based on about 800 kids. As part of the study, the kids tracked and reported on their own activity levels, and took physical exams.

    U. S. fitness guidelines suggest an hour or more of physical activity every day. According to the study, only 1 in 4 U.S. kids get enough physical activity.

    "It's certainly worrying to see that our kids have such a limited amount of physical activity each day," said Dr. Stephen Pont. He is an expert on children's health.

    Few kids in the study met the guidelines on physical activity that raises the heart rate and makes people breathe harder. Overall, about 25% said they got an hour of that kind of exercise every day. Kids also reported on which activities they did most often outside of school gym class--basketball for boys and running for girls.

    The study found that fat teenagers were less active than normal-weight girls and boys. Fat girls were slightly less active than normal-weight girls, but levels were similar among overweight and normal-weight boys. The study also said that the percent of fat children aged 2 to 19 was 17%, or about 12.5 million kids.

    "There's always room for improvement," said Tala Fakhouri, who was the leader of the study. She also said the results provide useful information to help with fitness campaigns such as Let's Move, which was initiated by Michelle Obama in 2010. To inspire kids to eat right and get in shape, Michelle visits schools and holds exercise events. She also calls on schools to offer regular gym classes.

    The study also found kids who get physical education at school may get better grades.

Last August, the 900-year-old Wan'an Bridge in Pingnan County, a locality of Ningde City in the coastal Fujian province, was destroyed when it suddenly caught fire.

Wan'an, a national-level protected building, was a wooden arch corridor bridge (木拱廊桥),which for centuries was an ancient architectural calling card for the region. The bridge,98.2 meters long and 4.7 meters wide, was first built in the Song dynasty (960~1279), and was the longest wooden arch corridor bridge left standing in China. Few, however, had imagined that such an ancient bridge would attract public attention in such a way.

Amid the powerful voice of the local population for new wooden arch bridges, the traditional techniques behind the building work have well and truly been revived (唤醒), but the protection of the ancient buildings still has much room for improvement.

Currently, China's approach to the protection of national heritage sites puts protecting and rescuing endangered buildings before all else, but to keep these ancient buildings alive, preventive protection is key.

"Technically, restoring (修复) Wan'an isn't very difficult," said Li, Deputy County Mayor of Pingnan. "Along with the help of the local inheritors of the national intangible cultural heritage, the bridge's restoration looks hopeful. However, the historical value will definitely be affected."

Meanwhile, Zhan, the former Deputy Dean at the Chinese Academy of Cultural Heritage, pointed out the recent destruction of Wan'an Bridge highlights a serious shortage of warning mechanisms and preventative protection measures, which currently are supposed to be the most important part of protection. "Significant improvements have been made in the past few years in protection, but we still have a long way to go on proper planning for protection work. How to protect cultural heritage is a matter that we need to discuss as soon as possible," he added.