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 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 a bunch of individual components (零件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. “The added difficulty with such a project is that actually none of those components are off the shelf and so we have to make 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 individual components, each of which individually has to perform well, and 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.

    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 (应用). “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.”

    Wedding is one of the most universal traditions in the world. But it's celebrated differently by people around the world. Now let's know something about these traditions.

       In Jamaica, weddings are a community affair, with the whole village often coming together to help plan the big day. People in the village gather in the street to see the bride and if she isn't in perfect shape, she will be publicly criticized. And while women wear the typical white wedding dress，men wear a bush jacket for the event. Several cakes are baked for the ceremony and on the wedding day married women wearing white dresses carry the confections (甜点) to the wedding. The reception is often held at the groom's house, in a booth specially built for the event. The wedding celebration also includes a lot of dancing.

    In Welsh wedding tradition, a man carves a spoon out of wood and gives it to the woman he loves. H she wears it, they are engaged (订婚）. Brides are often hidden by their families just before their wedding day. The groom and his family follow and whoever finds her will be the next to get married.

    In her bouquet, a Welsh bride carries a small tree with shiny green leaves and white flowers that smell nice as a symbol of love, and gives a cutting of the plant to her bridesmaids as well. If the bridesmaid plants the cutting in her yard and it blooms, she will soon marry, according to Welsh tradition.

    In Czechoslovak, before the wedding, the bride's friends traditionally plant a tree in her yard and decorate it with colored ribbons and eggshells, because, according to the legend, the bride will live as long as the tree. Before the marriage vows, a baby is placed in the couple*8 bed to bless their fertility. During the wading ceremony, Czech women surround the bride*, dancing and singing. They then remove her veil (面纱）and make her put on a handrnade babushka ( a woman's head scarf).

    I can proudly say that last year I broke the record for the oldest person in the world to ride a roller-coaster. I'm 105, but I feel younger. Even the doctor agrees I'm in good condition. I'm a bit deaf and my legs feel weak, but they are the only issue.

    I rode the Twistosaurus at Flamingo Land, which spins you round quite fast. I didn't choose to go on that. I'd have preferred a really fast one that went upside down. But I was told I couldn't ride something like that, because my blood pressure could drop and I might have some danger.

    I wasn't nervous — I don't get frightened of anything. I was securely fastened, so I knew I wouldn't fall out. The roller-coaster ride went on for three or four minutes, and it couldn't be a better experience. And I raised a lot of money for the Derbyshire, Leicestershire & Rutland Air Ambulance fund, which was fantastic.

    People were saying I'd got a place in the Guinness World Records. Later, someone came to present me with the certificate. I had it on the wall in my living room, with another one that got a year earlier.

    My record-breaking ways really began a couple of years ago, with the ice-bucket challenge. It turned out that I was probably the oldest person in the world to do it, and the video was very popular. After that, I started to think about what else I could do to raise money for different charities.

    I'm not sure if anyone admires all the fun I'm having. They just say I'm daft and that's about it. But I've had many good days and many exciting times. I've had a really good life. I don't think I've wasted any of it.

    When it comes to learning a foreign language, many people wonder if they will be able to memorize enough vocabulary. But this question never happens about their mother tongue, and yet, it was a foreign language once. However, among all the questions that new parents ask, no doctor has ever heard: "Will my baby be able to learn my language?" Be honest, do you know all the words of your mother tongue? The answer is: "no".

    New words, and new ways of using old words, appear every day. Twenty years ago, who could have been able to understand a sentence like this: "Click here to download your digital book."? Nobody. You never stop learning new vocabulary and you never know how long you will need it.

    Sometimes, you have the word on the tip of your tongue...and it sticks there! But you do know this phenomenon(现象) and don't think that it is because of a bad memory. You should not give this phenomenon more importance in the language you are learning than in your mother tongue.

    You need to learn only 2000 or so basic words to be able to create any phrase you need. You can't avoid some work in order to learn these necessary words and all the more if you want to learn quickly. And before you consider buying into any method, be sure it is right for you. It is not wise to depend on any method based upon mnemonics(记忆群). The first few words seem very easy to learn, so you buy the course, but then you discover quickly, though too late, that a dozen words later, it is all the more difficult to learn a new word when you have also to learn the trick to memorize it.

    Jimmy is an automotive mechanic (汽车修理技工), but he lost his job a few months ago. He has a good heart, but always feared applying for a new job.

    One day, he gathered up all his strength and decided to attend a job interview. His appointment was at 10 a.m. and it was already 8:30. While waiting for a bus to the office where he was supposed to be interviewed, he saw an elderly man wildly kicking the tyre of his car. Obviously there was something wrong with the car. Jimmy immediately went up to lend him a hand. When Jimmy finished working on the car, the old man asked him how much he should pay for the service. Jimmy said there was no need to pay him; he just helped someone in need, and he had to rush for an interview. Then the old man said, "Well, I could take you to the office for your interview. It's the least I could do. Please, I insist." Jimmy agreed.

    Upon arrival, Jimmy found a long line of applicants waiting to be interviewed. Jimmy still had some grease (油渍) on him after the car repair, but he did not have much time to wash it off or have a change of shirt. One by one, the applicants left the interviewer's office with disappointed looks on their faces. Finally his name was called.  The interviewer was sitting on a large chair facing the office window. Rocking the chair back and forth, he asked, "Do you really need to be interviewed?" Jimmy's heart sank. "With the way I look now, how could I possibly pass this interview?" He thought to himself.

    Then the interviewer turned the chair and to Jimmy's surprise, it was the old man he helped earlier in the morning. It turned out that he was the General Manager of the company.

    "Sorry I had to keep you waiting, but I was pretty sure I made the right decision to have you as part of our workforce (职工) before you even stepped into this office. I just know you'd be a trustworthy worker. Congratulations!" Jimmy sat down and they shared a cup of well-deserved coffee as he landed himself a new job.

In 2011, Nancy Ballard went for a routine check-up that turned into something extraordinary. In fact, she was carrying a painting of a plant she'd done when she arrived at her doctor's San Francisco office. "It would be great if we had artwork like that for our chemotherapy(化疗) rooms," the nurse said. Ballard asked to see one. 

She was shocked by what she found. The walls were dull and bare, and the paint was falling. It was a depressing room for a depressing routine—patients were restricted to chemo drips for perhaps several hours, often with nothing to look at other than those sad walls. Ballard didn't have cancer herself, but she could sympathize with the patients. "I couldn't imagine how anyone could even think about getting healthy in a room like that," she says. As it happened, Ballard's physician, Stephen Hufford, was ill with cancer himself, so finding time to decorate the rooms was low on his to-do list. So Ballard made it her task to brighten up the place. 

She started by emailing 20 local designers. "I wrote, ‘You don't know me. But my heart hurts after seeing these rooms,'" she remembers. She then asked whether they would donate their time and money to transform just one of Dr Hufford's rooms each. 

As it happened, six of them wrote back almost immediately. Six rooms got new paint, light fixtures, artwork and furniture. Dr Hufford was delighted. "All the patients feel relieved of the pain because of it," he said. He even noted that his own tone of voice was different in the rooms and that he was better able to connect with his patients. 

Ballard was so encouraged by the patients' reactions that she created a non-profit organization to raise money and decorate more spaces. Since then, she has worked on 20 projects, including one in Pennsylvania. "We were in Philadelphia for a ribbon-cutting(剪彩), and a woman was there on her third battle with cancer," says Ballard. "When she saw what we'd done, she said, ‘I'm gonna beat it this time. I thought I wasn't going to, but now I know I'm gonna beat it.'"