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.”

    Winter running is the best way to lose winter weight. But before heading out, make sure you have a solid plan. You don't want to come across accident along the way.{#blank#}1{#/blank#}

Wear the Right Shoes

    The right shoes will depend on the road. You want shoes that are made for the kind of surface you run on. For example, if you are running on slippery surfaces, you want shoes with great friction(摩擦力). {#blank#}2{#/blank#}When trying out a pair of running shoes, check the fit, feel and ride of the shoes. These elements(要素) are important once you take your new shoes out for a run.

Warm Up

    Warm up is an important part to keep fit. Especially if temperatures drop and your muscles are stiff(僵硬的) from the cold! {#blank#}3{#/blank#} It also prepares the muscles for the intense (激烈的) activity ahead. The cold climate won't feel as cold when you do warm ups. This is because blood flows much faster after a good warm up!

Deal with Wind

    {#blank#}4{#/blank#}The key is to run into the wind and finish by running against it. This keeps icy wind from blasting(用力撞击) your face. To prevent any injuries or accidents, break your run into small parts. {#blank#}5{#/blank#} You can use certain creams on the nose and cheeks to prevent frostbite(冻疮).Don't skip your sun-block if you're running during the day. UVB(紫外线)passes through the clouds. Running for an extended period on a cloudy day will still damage the skin!

A．Don't run in the wind.

B．Running makes you warm.

C．Warming up prevents injuries.

D．It's hard to run if it's too windy.

E．Your shoes should fit very well so you don't slip.

F．Here we are giving you important tips to remember.

G．It also helps to keep the skin protected from the wind.

    Spanish River Park

    Location: 3001 Ocean Blvd.,Boca Raton.

    Admission: $16 per vehicle on weekdays,$18 on weekends and major holidays.

    Special Comments: About 95 acres,more than a half-mile of beach with lifeguards.No pets.1,680-foot nature path and large playground area.

    Food/Dining: Picnic areas with barbecue grills（烤肉架）.Phone: (561)393-7811

    Restores: Restrooms and showers available.

    Red Reef Park

    Location: 1400 N.Ocean Blvd.,Boo2 Raton.

    Admission: $16 per vehicle on weekdays,$18 on weekends and major holidays.

    Special Comments: Developed beach (67 acres) with lifeguards.No alcohol or pets permitted.It offers grills and a small playground area.

    Food/Dining: Picnic areas available.Phone: (561) 393-7812

    Restrooms: Restrooms and showers available.

    South Beach Park

    Location: 400 N.Ocean Blvd.,Boca Raton.

    Admission: $15 per vehicle on weekdays,$17 on weekends and major holidays.

    Special Comments: 1,670 feet of beach,25 acres,lifeguards,955 feet of developed beach south of Boca Inlet with lifeguards.

    Food/Dining: Picnic areas available.Phone: (561) 393-7813

    Restrooms: Restrooms and showers available.

    Coconut Cove Waterpark

    Location: 11200 Park Access Road,Boca Raton.

    Admission: Adult $7; Children(4~12)$5; 3 and under free.

    Special Comments: The waterpark offers Sea Monster（怪物）walk pool,Meandering River,a waterslide and a waterfall.No alcohol or pets permitted.

    Food/Dining: Concessions.Phone: (561) 274-1140

    Restrooms: Restrooms and showers available.

    For thousands of years, we have looked for ways to measure time. Early humans found that the regular movements of the sun, the earth> the moon, and the stars made good ways to measure time. The rising and setting of the sun were used to distinguish (辨别) day from night.

    But, eventually, people needed to tell time more accurately, or exactly. So, by using the sun's position in the sky, they divided the day into dawn, morning, midday and evening.

    Then it was noted that the sun cast a changing shadow as it moved across the sky. Time could be told more accurately by setting up a stick and marking the positions of the sun's shadow. It was the ancient Greeks who divided each position of this “sundial (日晷)” into hours.

    But the sun doesn't always shine. So, for the past 6,000 years, many other ways of keeping time have been tried. Slow-burning candles were divided into hours, and the hourglass was invented. When all the sand in the top of an hourglass has shifted to the bottom, an hour has passed.

    Later, the pendulum (摆钟), with its regular back-and-forth movement of weights, was used to move the hands on a clock. Pendulums are still used in grandfather clocks.

    Today, even more accurate clocks are in use, such as battery-operated quartz clocks (石英钟), digital clocks, and clocks run by electrical tuning forks and tiny atoms. These atomic clocks are the most accurate clocks ever invented. The exact time can be kept to within 1 second a century.

    Are you so sure your mistakes are just mistakes? Or could they be building blocks to a success beyond any you imagined?

    When my friend Dorothy goes home to visit her family each Thanksgiving, her mother serves the traditional “mistake salad”. The dish was born many years ago, Dorothy explains, when mother was using a cookbook to make a salad. In the process, by mistake, mother included half the salad ingredients (原料) from a recipe (食谱) on the left side of the open cookbook, and half the ingredients from a different salad recipe on the opposite page. Everyone enjoyed the salad so much that she continued to serve it every year. So it was really not a mistake at all.

    Then there was the man named Alfred, who invented dynamite (炸药). When Alfred's brother died, the city newspaper mistook his brother for him, saying in the news that the dead's most famous act was the creation of bombs (炸弹). Surprised to consider that his name would forever be connected with destruction, Alfred wanted to leave a more positive impression on people. So he set a prize for people who made contributions to world peace. Now the Nobel Prize, set up by Alfred Nobel, is the most respected prize in the world.

    Everything is part of something bigger, and so are mistakes. In his brilliant book Illusions, Richard Bach explains that every problem comes to you with a gift. If you only fix your attention on what went wrong, you miss the gift. If you are willing to look deeper and ask for the bright, the problem will disappear. You are left only with the learning, and you go forward on your path.

Most parents are worried the first time they catch their kids out in a lie. According to child and teen psychiatrist Gayani DeSilva, lying can actually be a sign of healthy development in young children. "Kids lie for many reasons, and much of it is normal," DeSilva says. "People are not born with the knowledge of communicating with others and getting their needs met. They'll experiment with different communication styles and techniques until they find the ones that work best for them. Lying is one of those techniques."

As kids get older, they become more aware of how their actions affect others, and many will lie less frequently. In spite of this, parents still need to Lead their kids to form a habit of not lying. According to DeSilva, when children lie, look at them directly and ask what they need. After they tell you, gently remind them that telling you directly will be more effective than lying.

It's also a good idea to model the behavior you want to see in your kids. In other words, don't lie to your children. This will set you and your children on a course of open communication and trust.In some cases, lying is a sign of a deeper issue. A child who is neglected will lie more than a child who has attentive and responsive parents. He's not sure whether he's loved. He may lie to please others. The same goes for a child who has experienced something unpleasant. He may lie to try to hide his shame, avoid admitting his needs, or to control his surroundings to ensure his safety.

By paying attention to the reasons behind a lie, parents can figure out what need to be done. For example, while Jack might lie about completing his homework in order to play video games, he also might be trying to avoid negative feelings connected with school work, and this is just where parents should start, says therapist Gideon Javna.