Love to sink into your chairs and relax when you get to school? Then you will not be happy to hear that schools all over the world are seriously considering exchanging traditional desks for ones with no seats at all — Yes, that means you will be encouraged to stand through those already too long math and science lessons! Why would anyone even think of putting kids to such cruelty? Experts say it improves their health and helps fight obesity. While that may seem a little far-fetched (牵强的), the officials at the few schools around the world seem to agree.

    Among them are educators from the College Station Independent School District in Texas, who recently completed aweek-long experiment involving 480 students across three elementary schools. The 374 kids that agreed to participate in the study were provided with adevice that helped record step count and calorie consumption over the entireperiod.

    All 25 teachers involved in the study reported that students appeared to be more alert and concentrate better, when allowed to stand. The one thing that did surprise the researchers was that younger kids were more willing to stay standing than kids in higher grades. They believe this may have something to do with the fact that after years ofbeing asked to “sit still”, older kids have a harder time adjusting to this unexpected freedom.

    American schools are not the only ones reporting success with stand-up desks. Four Catholic schools in Perth,Australia, which have been testing them since October 2013, have seen similar results. In May 2014, Grove House Primary School in Bradford, West Yorkshire,became Europe's first test one, with a seven-week trial that involved the useof desks made by Ergotron in their fifth-grade classrooms. While official results are not out yet, early reactions from both teachers and students, have been extremely encouraging.

    The findings of these studies and othersdone previously, all seem to mean that allowing kids to move around in classrooms is a win-win for students and teachers — it helps kids get healthier and provides educators with a more engaged audience.

    Breakthroughs in science and technology are paving the way for modern cities to support bigger populations. Now, we see the most exciting urban innovations to show you exactly how they'll improve your city's infrastructure(基础设施).

Lighting Up The Night

    Anthony Di Mari dreamed up an electric tree to help irrigate public parks and light them at night. These electric trees contain a special infill (填充物) that collects water from rainfall. The water is then distributed through a shallow underground irrigation system with the help from the trees' swaying movement. An electric motor turns energy from the waving of the artificial trees into electricity, which is used to light up the trees' outer LEDs.

Thinking Outside The Box

    As more people flock to urban areas, city planners will need to get increasingly creative about how to satisfy residents' health and transportation needs within decreasing available space. One way to achieve this is by updating infrastructure to support biking and walking by building suspended(悬浮的) roundabouts like hovering in the Netherlands. By lifting bicycle and pedestrian traffic above busy roadways, cities can significantly decrease over-crowded traffic condition.

Waving Hello To Clean Energy

    Cities that don't receive enough sunlight may find an attractive alternative in wave power. Since ocean waves rarely experience disruption(中断), electric engines driven by their clockwork push-and-pull can reliably provide power throughout the year. Further, thanks to advances in wave power technology, engineers have been able to move wave power engines farther offshore, where the waves pack the most punch, making the engines extremely efficient. So in the future, heavily populated coastal cities may use wave to meet their energy needs.

How to find the perfect career

    Too many people are not satisfied with their professional career (事业) and are “stuck” in situations that do not make them happy. Here are some wonderful actions you can take to begin the path to a truly happy career.

Talk to your friends.

    Ask them, “what do you think I am best at”, or “what do you think I enjoy doing most”. {#blank#}1{#/blank#}However, their advice may help you decide what you should do.

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    Read some interesting magazines, books, newspapers or novels. They will give you a constant flow of ideas and keep the mind rich.

Talk to the happiest and most successful people you know.

    {#blank#}3{#/blank#} Be serious with your questions. And see if there is anything you can learn from them. Have these people become your teachers and friends.

Keep a journal（日记）.

    Writing down your ideas is an important practice for your career growth. {#blank#}4{#/blank#}You never know when great ideas will come to your mind!

Develop patience.

    You may want a change in your career right now. {#blank#}5{#/blank#}Anyway, doing the practices mentioned above will bring about the right chance much faster.

    Is your school good for the environment?

    Being green wasn't easy for Kermit the Frog(a famous cartoon character)—but it is for a growing number of schools around the country.A "green" school is an environmentally friendly building that uses less energy by depending on earth's natural resources for heat,light,and power.Green schools have clean air,a lot of natural light,and renewable power sources.

    New studies show that green schools are not only good for the environment,but good for you too!Kids in classrooms with a lot of daylight scored 25 percent higher on reading and math tests than students who studied in rooms with less natural light.Students in schools with more natural light took three to four fewer sick days than students exposed to artificial classroom lighting.The further study found that those students had less dental decay（龋齿）because they were exposed to more of the vitamin D produced by the sun.

The Willow School in N.J. is a school that was built as a green building in 2002.Parts of the building are made wholly from recycled materials.To help trap heat,for example,building workers filled the walls with material from old blue jeans instead of the traditional insulation（绝缘物）made of chemicals.Every classroom has skylights to allow most sunlight,and solar panels（太阳能电池板）line the south end of the building.It uses about 70 percent less energy than a non-green school.This helps the school cut down on high energy costs.

    Kate Burke Walsh,head of the Willow School,says,"Sunlight has an impact—you're happier."The clean,natural surroundings help both students and teachers "handle stress and stay relaxed and focused…it's a very calming atmosphere."

Why Mars (火星) is New Settlement

    Is it possible to live on other planets? The United States government is taking a serious look at the moon and Mars as potential places for future human settlement. The moon could serve as a training ground for later journeys to Mars. Currently, with Mars becoming the eventual long-term goal, serious questions exist as to whether the dangers of the settlement on the moon are too extreme and unnecessary.

    One major reason the settlement on the moon is too dangerous is the difference between the atmosphere environment of the moon and Mars. Atmosphere is important because it protects humans and all other life from a continuous attack of radiation (辐射) caused by sources such as the sun. This radiation is especially dangerous to humans because it increases the risk of cancer and can negatively change DNA. The fact that the moon has no atmosphere can cause great harm to human beings. Although Mars' atmosphere is significantly thinner than Earth's, at least it has one and would create some sort of protective barrier for humans.

    Another important characteristic necessary for human settlement is natural resources like water, of which the moon is believed to have none. Mars, however, contains vast quantities of water ice, dry ice, and also snow. There is also sufficient evidence that water once existed at the surface of Mars and might return in the future if the planet warms. With increased technologies, the potential for settlers to remain on Mars by being increasingly self-sufficient makes Mars a much more attractive goal as the space settlement than the moon.

    Future settlers will not only benefit from potential water on Mars; the planet is also rich in other natural resources such as oxygen, hydrogen, and minerals, which can be well used in productive ways.  For example, hydrogen can be used as fuel, and it can be combined with nitrogen (氮气) to form new materials necessary for human settlement. Due to these advantages,

    Mars would be a more successful planet for exploration and settlement because it contains the basic resources necessary for humans to survive.

    Since the environment of Mars is more similar to that of Earth and it contains resources necessary to  help  life  exist,  it should  be  the  only option for any kind of long-term human settlement. The settlement on Mars would not only be a milestone in space but also an excellent chance for mankind to improve itself from past adventures on Earth and preserve and make the best use of the natural resources Mars has to offer.

    My grandmother often said to me, "You can count the number of your true friends on the fingers of one hand." For a long time I thought this was true. However, I've now discovered my grandmother was only half right. Maybe we do only make a few "best" friends in our lifetime, but those aren't the only people that we can call friends. There are many different types. Let me tell you about a few of them.

    One type of friends is the type I call the "football mom friends". My neighbour Sally is a good example. We both have kids who play football in a football club, and someone has to take them to practise and pick them up. Sally and I and two other mothers do this. We meet sometimes and have tea and talk about what our kids are doing, but those are the only times that we meet each other. I enjoy being with these women, but we don't do anything else together.

    Another type is called the "hobby friend". That's the person you share an interest or a hobby with. Michael and Cater, who are brothers, are a good example of this type. We're all in a bird watching club. Every few weekends the members of the club go on a trip to watch different kinds of birds. There's nothing romantic about my relationship with Michael and Cater, of course. We just share interest in birds.

    Then there's the "other half the couple" type of friends. Jim is married to Rose, a friend that I have known since college. When Rose married Jim, I realized that I would have to be Jim's friend if I want to continue to be Rose's. Jim and I don't share so many interests, but we do have a friendly relationship.