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.”

    {#blank#}1{#/blank#} When a starving man gets a meal, he begins to think about an overcoat; when a manager gets a new sports car, visions of country clubs dance into view.

    The many wants of mankind might be regarded as making up several levels. {#blank#}2{#/blank#}.

    The first and most basic level of wants is food. Once this want is satisfied, a second level of wants appears: clothing and some sort of shelter. By the end of World War II these wants were satisfied for a great majority of Americans. {#blank#}3{#/blank#} It included such items as cars and new houses.

    By 1957 or 1958 this third level of wants was fairly well satisfied. Then, in the late 1950s a fourth level of wants appeared: the “life-enriching” level. While the other levels mean physical satisfaction－the feeding, comfort, safety, and transportation of the human body－this level stresses mental needs for recognition, achievement and happiness. It includes a variety of goods and services, many of which could be called “luxury” items(奢侈品). Among them are vacation trips, the best medical care, and entertainment. {#blank#}4{#/blank#}

    On this level, a greater percentage of consumer spending goes to services, while on the first three levels more is spent on goods. Will consumers raise their sights to a fifth level of wants as their income increases, or will they continue to demand luxuries and personal services on the fourth level?

    A fifth level probably would be wants that can be achieved best by community action. Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime and prejudice. {#blank#}5{#/blank#} In this way, we can enjoy more fully the good things on the first four levels.

 A．Then a third level appeared.

 B．Human wants seem endless.

 C．When there is money enough to satisfy one level of wants, another level appears.

 D．There are several levels of wants in one's life.

 E．At this stage, we now may seek to ensure the health, safety, and leisure.

 F．Also included here are fancy foods and the latest styles in clothing.

 G．Different people have different wants on each level 

    My 17-year-old daughter went off to college and having her away from home brought back memories of watching Peter Pan when she was little. In the classic TV production, one scene in particular impressed me: when Mrs. Darling puts her children into bed. As she turns off the last of the night light, she takes one last look at the bedroom and says, “Dear night lights, protect my sleeping children.” As a mother, I know how much she loves her children.

    It has been several weeks since we took our daughter to college and she seems to be adjusting  well after a short period of homesickness. For us, though, it's another story. Like most parents, I love checking in on my children at night. But now she's gone, and I find night times the hardest. I miss her most at night.

    In my neighborhood, most of the parents whose kids are off to college are dealing with similar melancholy. My husband is filled with anxiety. One friend talked about getting this sick feeling in her stomach as she prepared for the college drop-off. We complained that many of us were too busy to truly enjoy being with our children while we had them.

    For us moms, seeing Toy Story 3 only made the sadness worse as we watched the character Andy, who is the same age as our kids, say goodbye to his childhood as he prepares to leave for college. And it's not just “first-time” parents like me. Two moms who have kids already well into college said the separation didn't get any easier. “You feel like something has been taken away from inside you” said one of them.

    I imagine things will get easier with time, especially as I see my daughter adjust to college life. Meanwhile, as I keep my cell phone close to me in bed and text my daughter goodnight and sweet dreams every night, I like to think that messages serve as a night light that keeps her safe.

    When I graduated from high school, I wanted to major in comparative literature. But, once I found out my friends were going into "real" majors, like marketing, nursing, and engineering, I figured I needed to do the same to ensure a good career. So I changed my mind and chose Business Management as my major. I forced myself to believe that I would enjoy it and succeed in the future, but eventually I exhausted myself understanding the economy and trying new marketing techniques. Coming out of this experience, I realize it is ok to be different from others and to study things like art history and other majors offered in the College of Humanities(人文学科)!

    The worries most people have about a Humanities degree and finding a career afterwards are that the majors are too abstract, and one will not obtain any applicable skills. Actually ideas discussed in Humanities classes, which are occasionally different from what people commonly believe, offer a broad perspective(视角). How could one effectively be an unbiased(无偏见的)writer with only a knowledge of the popular opinion of society? How could one speak persuasively with closed minds? Only seeing the world through a single perspective leads to missed learning, missed friendships, and missed growth! With a broader perspective, we'll be freer, more open-minded, and less limited in what we can become!

    STEM (science, technology, engineering, and mathematics) graduates learn actual skills in their studies, while humanities majors learn “soft skills” like communicating effectively through writing critically and speaking persuasively, synthesizing(综合)ideas through gathering and interpreting information, and developing cultural awareness. Do those soft skills sound useless and inapplicable to you? Think of it. How often do you communicate with others? Produce ideas? Encounter people from other cultures? Every day. Every SECOND of every day. So why not master these skills?

    If you choose a major in the College of Humanities, you will be needed. The job market is quietly creating thousands of openings a week for people who can bring a humanist's grace to our rapidly evolving high-tech future. Your skills will be valuable to any workplace you hope to be in. Chase after your dream major with all your energy, no matter what other people think.

    Can you trust your very first childhood memories? Maybe not, a new study suggests.

    Past researches show that people's earliest memories typically form around 3 to 3. 5 years of age. But in a recent survey of more than 6,600 people, British scientists have found that 39 percent of participants claimed to have memories from age 2 or younger. These first memories are likely false, the researchers said. This was particularly the case for middle -aged and older adults.

    For the study, researchers asked participants to describe their first memory and the age at which it occurred. Participants were told they had to be sure the memory was the one that had happened. For example, it shouldn't be based on a photograph, a family story or any source other than direct experiences. Then the researchers examined the content, language and descriptive details of these earliest memories and worked out the likely reasons why people would claim to have memories from an age when memories cannot form.

    As many of these memories dated before the age of 2, this suggests they were not based on actual facts, but facts or knowledge about their babyhood or childhood from photographs or family stories. Often these false memories are fired by a part of an early experience, such as family relationships or feeling sad, the researchers explained.

    "We suggest that what a rememberer has in mind when recalling fictional early memories is …a mental representation consisting of remembered pieces of early experiences and some facts or knowledge about their own babyhood or childhood," study author Shania Kantar said in a journal news release, "Additionally, further details may be unconsciously inferred or added. Such memory-like mental representations come over time, to be collectively experienced when they come to mind, so for the individual, they quite simply are memories, which particularly point to babyhood."

    "Importantly, the person remembering them doesn't know this is fictional," study co-author Martin Conway said "In fact, when people are told that their memories are false they often don't believe it."

Elephants might be the most well－known and well－loved animal in African wildlife. But conservation (保护) of the African elephant faces special difficulties. While the elephant population is half of what it was 40 years ago, some areas of Africa have more elephants than populated areas can support. That's why AWF scientists are studying elephant behavior, protecting habitats and finding ways for humans to live peacefully with elephants in Africa.

Years ago, overhunting and the ivory trade were the biggest threats to elephants' survival. Luckily, ivory bans (禁令), hunting rules and protected areas protect elephants from these dangers today.

The 21st century brings a different challenge to elephant conservation—land－use. Elephants walk across borders and outside parks and other protected areas. So they often destroy crops, causing conflicts (冲突) between local farmers and these big animals.

Successful conservation strategies (策略) must allow elephants to walk freely in their natural habitats while reducing conflicts between elephants and local people.

AWF researchers are searching for a way to give both elephants and people the space they need. The AWF is collecting information on elephant habitats and behavior. The information they gather will help to develop the widest possible space for elephants.

The AWF is helping elephants by protecting their habitats. And they also work with local farmers to improve their life in order to encourage them to protect rather than destroy elephants.