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.”

    A new study of 8,000 young people in the Journal of Health and Social Behavior shows that although love can make adults live healthily and happily, it is a bad thing for young people．Puppy love（早恋）may bring stress for young people and can lead to depression (沮丧，抑郁）. The study shows that girls become more depressed than boys, and younger girls are the worst of all．

    The possible reason for the connection between love and higher risk of depression for girls is “loss of self”．According to the study，even though boys would say “lose themselves in a romantic relationship”，this “loss of self” is much more likely to lead to depression when it happens to girls. Young girls who have romantic relationships usually like hiding their feelings and opinions．They won't tell that to their parents．

    Dr Marianm Kaufman，an expert on young people problems，says 15% to 20% young people will have depression during their growing. Trying romance often causes the depression．She advises kids not to jump into romance too early. During growing up，it is important for young people to build strong friendships and a strong sense of self．She also suggests the parents should encourage their kids to keep close to their friends, attend more interesting school activities and spend enough time with family．

    Parents should watch for signs of depression—eating or mood changes—and if they see signs from their daughters or sons, they need to give help. The good news is that the connection between romance and depression seems to become weak with age．Love will always make us feel young，but only maturity （成熟） gives us a chance to avoid its bad side effects．

    Most heroes are not super. They don't appear in comic books, on television, or in movies. They just do what they believe needs to be done to make their world a better place. Bike Batman is one of them.

    Bike Batman is a 30-year-old married engineer who lives in Seattle, Washington. He's a cyclist who also buys and sells bikes as a hobby.

    About three years ago, he was looking for a bike for his wife. He found one on Craigslist, a website where people list things they want to sell. As he often does, he also looked at Bike Index, a popular website that allows users to register their bikes and post reports when they're taken. The bike, which he was considering purchasing, clearly matched one reported stolen on Bike Index. Then he called the person who claimed to be the bike's owner and arranged to meet him— supposedly to complete the sale. When the two men met, Bike Batman told the thief, “You've got two options. You can wait until a police officer gets here, or you can just get out of here.” You can imagine what the thief did.

    After that first success, Bike Batman developed a safer routine. When he sees questionable bike ads on Craigslist, he cross references the image with bikes reported on Bike Index. Once he has confirmed it with the owner, he arranges a meet-up with the thief and will call the Seattle police department so that officers can participate in the action. In more than half of the 22 cases in which he has got back and returned bikes, the thieves have been arrested. In one case, Bike Batman even helped a family recover a wide range of prized possessions that suspects had stolen during a home burglary.

    His nickname came from a discussion with a police officer who suggested he be called “Robin Hood”. Since he wasn't exactly stealing from the rich and giving to the poor, “Batman” seemed a better fit. The idea of a superhero punishing criminals feels pretty silly to him, but the main reason he continues his work is to keep up Seattle's reputation as a friendly city.

    A sense of humor is something highly valued. A person who has a great sense of humor is often considered to be happy and socially confident. However, humor is a double-edged sword. Sometimes it can damage self-respect and annoy others.

    People who use bonding humor tell jokes and generally lighten the mood. They're thought to be good at reducing the tension in uncomfortable situations. They often make fun of their common experiences, and sometimes they may even laugh off their own misfortunes. The basic message they deliver is: We're all alike, we find the same things funny, and we're all in this together.

    Put-down humor, on the other hand, is an aggressive type of humor used to criticize others through teasing. When it's aimed against politicians, as it often is, it's extremely funny and mostly harmless. But in the real world, it may have a harmful effect. An example of such humor is telling friends an embarrassing story about another friend. When challenged about their teasing, the put-down jokers might claim that they are "just kidding," thus allowing themselves to avoid responsibility. This type of humor, though considered by some people to be socially acceptable, may hurt the feelings of the one being teased and thus have a bad effect on personal relationships.

    Finally, in hate-me humor, the joker is the target of the joke for the amusement of others. This type of humor was used by comedians John Belushi and Chris Farley—both of whom suffered for their success in show business. A small amount of such humor is charming, but routinely offering oneself up to be embarrassed destroys one's self-esteem, and fosters depression and anxiety.

    So it seems that being funny isn't necessarily an indicator of good social skills and well-being. In certain cases, it may actually have a negative effect on interpersonal relationships.

    It's comforting to think if you were somehow swallowed by a whale, you'd simply hang out in his stomach until he eventually spat you out, unharmed and whole. Unfortunately, your chance of ending up in this type of situation is pretty low.

    In 2012 reporter Ben Shattuck read the records at the New Bedford Whaling Museum Research Library. Despite his extensive research at one of the most comprehensive whaling archives(档案), he failed to find a single report of anyone ever being swallowed alive by a whale. He found plenty of reports of whalers who were bitten or injured by the creatures, and several who died after fighting with a whale, but none related to swallowing.

    With whales' large mouths, it certainly seems possible that a whale could swallow someone whole, so why is it so unlikely? Baleen whales, or whales without teeth, are some of the largest creatures on the planet. Despite their massive size, baleen whales could never get you into their bellies thanks to their relatively small esophagus(食道). These whales are designed to eat small sea creatures, and the opening in their throat is only about as large as a basketball, so you'd never make it that far.

    But what about toothed whales? Sperm whales eat whole seals, so you could easily fit down their throats and into their stomachs. However, once you reached the first of the sperm whale's four stomachs, your journey would probably end quickly. Not only would the whale's stomach acid make quick work of you, but you'd experience a distinct lack of air on the inside. Actually, you're more likely to get eaten or injured as you try to make it past the sperm whale's sharp teeth. Plenty of whalers, have fought with sperm whales and lost their hands or lives due to these mean teeth.

    Welcome to iusEnglish, a wonderful online school that specializes in teaching English to school, aged Chinese children from seven to fifteen. We offer lessons focusing on English reading and writing. Because of the rapid growth of our school, we are now looking for more qualified（合格的）teachers to join us to teach 3rd & 4th grade.

    Online Teachers for 3rd & 4th Grade Reading and Writing Classes

    •Teach 3rd & 4th grade reading classes in an online environment ;

    •The students are Chinese children who are able to communicate in English ;

    •Class schedule will be set up according to teachers' time frame ;

    •Teachers are expected to create lessons and grade students' homework ;

    •40 minutes for a class and one class meeting once a week.

    Desired Skills & Experience

    •A recognized degree and a teaching qualification at the graduate level ;

    •Those with the teaching background in elementary school are highly preferred ;

    •Ability to plan, deliver and motivate students to learn;

    •Strong communication skills to work with cooperation ;

    •Native American English speakers ;

    •Be able to create lessons and prepare lesson plans ;

    •Love teaching! Patience, self­management, positive attitude, and most of all, be devoted ;

    • Two ­year experience in teaching online or in classroom circumstances for programming teachers.

    Teachers are able to work from the comfort of their own homes in the hours and days of their choosing. The benefits of joining iusEnglish are great. Besides earning extra income, teachers are rewarded by watching the continual progress of their students week by week. It' s a win­win situation, and we hope you will consider joining our team.

    Don't hesitate. Please contact us: ius@iusEnglish.com.