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.”

    We always knew our daughter Kendall was going to be a performer of some sort. She entertained people in our small town by putting on shows on our front porch when she was only three or four. Blonde-haired, blue-eyed, and beautiful, she sang like a little angel.

    When Kendall was five, we began to notice that she was blinking a lot and clearing her throat frequently. We took her to our local children's hospital where she was diagnosed with Tourette's Syndrome.

    It was pretty devastating（毁灭性的）because other children constantly made fun of her, and sadly, even a teacher teased her. Through all this, Kendall continued to sing and entertain. Remarkably, her tics disappeared when she sang.

    In 2005 when Kendall was sixteen, we thought she was pretty much out of the woods -- or at least heading in that direction. However, a freak accident happened.

    At a birthday party, Kendall hopped on a friend for a piggyback ride. Kendall flew over his back and landed on the cement floor -- on her neck. An ambulance rushed her to the hospital where she spent the next week, paralyzed from the neck down. Ironically, her biggest concern wasn't whether she would walk again, but whether she would be able to audition（试唱）for American Idol.

    Doctors said Kendall had central cord syndrome. Sometimes the pain was so unbearable that she had to bite down on a toothbrush to take her mind off it. As the days dragged on, we didn't know for sure how much of her movement would ever come back.

    I believe Kendall wanted the American Idol audition so much that she willed herself to move again. One of her friends brought a microphone to the hospital and put it on her bed. Every day, Kendall tried hard to pick it up with her right hand. It was more important for her to pick up that microphone than a spoon or fork.

    Sometimes we all cried because of the pain we witnessed. But on the day Kendall walked into the stadium to audition for American Idol – a mere three months after her accident -- we cried tears of joy. And our tears turned into shouts when she was given a golden ticket to Hollywood.

    Kendall is eighteen now, living every day to its fullest. She's recorded a CD with some of John Mellencamp's band members. I'm absolutely sure she's going to make it big some day. Kendall just puts it all in God's hands.

    When she was a little girl trying hard to be strong, she looked up at me, her big eyes brimming with tears, and asked me why she had to have Tourette's Syndrome. My heart ached to make the word right for my child. But I looked right back at her and told her the truth as I see it.

    “Kendall, God gave you a pure heart, an angelic voice, a strong mind, and a beautiful presence. With all of that, he had to make it fair for everyone else.”

    If you could have one superpower, what would it be?

    Dreaming about whether you would want to read minds, see through walls, or have superhuman strength may sound silly, but it actually gets to the heart of what really matters in your life.

    Every day in our work, we are inspired by the people we meet doing extraordinary things to improve the world.

    They have a different kind of superpower that all of us possess: the power to make a difference in the lives of others.

    We're not saying that everyone needs to contribute their lives to the poor. Your lives are busy enough doing homework, playing sports, making friends, seeking after your dreams. But we do think that you can live a more powerful life when you devote some of your time and energy to something much larger than yourself. Find an issue you are interested in and learn more. Volunteer or, if you can, contribute a little money to a cause. Whatever you do, don't be a bystander. Get involved. You may have the opportunity to make your biggest difference when you're older. But why not start now?

    Our own experience working together on health, development, and energy the last twenty years has been one of the most rewarding parts of our lives. It has changed who we are and continues to fuel our optimism about how much the lives of the poorest people will improve in the years ahead.

    What do you do for fun in your spare time? Do you like reading? Do you often go to a book store? There is a store that is so different from others.

    The World's Smallest Bookstore, whose official name is just these three words, sits quietly about 100 miles northeast of Toronto.

    The bookstore is about 10 feet by 10 feet, so it is easy to imagine how tiny it really is. The bookstore is open 24 hours a day. Inside the bookstore are various books, especially literary books and classic authors' works. So if you are looking for something less popular, you may get a bit disappointed there.

    Another special feature of this bookstore is that each book only costs three dollars. All the expenses are paid on the honor system, which means buyers should make a note of what they've bought and leave their money by themselves. So the tools of the trade in this bookstore are quite simple: pens, papers, light bulbs and a label-maker.

    In order to catch passers-by's attention, the billboards (广告牌) of the bookstore are several times bigger than the store itself. With these large eye-catchers, many people are willing to stop by and have a visit.

    You've heard of the fat suit and the pregnancy suit; now meet AGNES—the old person suit.

    AGNES stands for “Age Gain Now Empathy(换位体验)System” and was designed by researchers at MIT's AgeLab to let you know what it feels like—physically—to be 75 years old. “The business of old age demands new tools,” said Joseph Coughlin, director of the AgeLab. “While focus groups and observations and surveys can help you understand what the older consumer needs and wants, young marketers never get that Ah ha! moment of having difficulty opening a jar, or getting in and out of a car. That's what AGNES provides. ”

    Coughlin and his team carefully adjusted the suit to make the wearer just as uncomfortable as an old person who has spent a lifetime eating poorly and not doing much exercise. Special shoes provide a feeling of imbalance, while braces on the knees and elbows limit joint mobility. Gloves give the feeling of decreased strength and mobility in the hands and wrists, and earplugs make it difficult to hear high—pitched sounds and soft tones. A helmet with straps(带)attached to it presses the spine(脊柱), and more straps attached to the shoes decrease hamstring flexibility, and shortens the wearer's step.

    AGNES has been used most recently by a group of students working on a design of an updated walker. By wearing the suit they could see for themselves what design and materials would make the most sense for a physically limited older person. Coughlin said the suit has also been used by clothing companies, car companies and retail goods companies to help them understand the limitations of an older consumer.

    “AGNES is not the destiny of everybody,” he said. “She is a badly behaved lady who didn't eat and exercise very well. A secondary benefit we've found with AGNES is that it has become a powerful tool to get younger people to invest in their long-term health. ”

One Canada, Two Languages

    Canada is one of the few nations in the world to have two official languages: English and French. There are 10 provinces in the country but only one of these—Quebec is known as "French Canada". This is because it was founded by French explorers while British adventurers discovered the rest.

    Canada left the British empire(帝国) in 1867 to become an independent country and English and French have been recognized as the official languages ever since.

    Most people speak English as their first language and the two national television networks broadcast in English throughout the country. Apart from in Quebec and a few places on the east coast, French television is very rare.

    The same goes for traffic signs and menus, for example, outside of Quebec, there are only a few places where you'll see traffic signs in French. In restaurants, it's almost impossible to find French on the menu unless you are in the heartland (中心地带) of French Canada. However, all products sold in Canada must, by law, have labels (标签) and instructions in both languages.

    In Canada's English-speaking provinces, official bilingualism (双语) means that students can choose to complete a special French language course. Under this program, they are taught most of their subjects in French.

    If a student begins the course in kindergarten(幼儿园) or Grade One, it is likely that all their lessons will be in French. However, if they start at junior high school, 25 percent of the teaching will continue to be in English.