In American schools there is something called Homecoming Day. Many high schools and colleges with a football team have a homecoming game. This can be the most important event of the year except graduation or commencement (毕业典礼)Day. Students plan Homecoming Day many weeks in advance.

    Several days before Homecoming, students start to decorate the school. There are signs to wish luck to the team, and many other signs to welcome all the graduates. Many people still come to Homecoming twenty or thirty years after their graduation.

    The members of school clubs build booths(售货棚）and sell lemonade(柠檬汽水), apples and sandwiches. Some clubs help to welcome visitors.

    During the day alumni and their wives will gather at the school. They like to look for teachers that they remember. Often they see old friends and they talk together about those happy years in school.

    Everyone soon comes to watch the football game. When the game is half over, the band comes onto the field and plays school songs. Another important moment is when the Homecoming Queen or King appears. All the students vote the most popular student Homecoming Queen or King. It is a great honor to be chosen.

    Homecoming is a happy day, but it is not perfect unless the football team wins the game. Even if the game loses, the students still enjoy Homecoming. Some stay at the school to dance, and others go to a party. For everyone it is a day worth remembering.

    In the traffic lights,red means "stop",green means "go",and yellow means "hurry": Why those colors, though? Why not blue,purple,and brown?The following are transponded from others WeChat.

●Red is an inherited symbol from railroads

    Red symbolizes danger in many cultures,which makes sense,considering it has the longest wavelength of any color,meaning you can see it from a greater distance than other colors.Red has meant "stop" since long before cars existed,with railway signals use of red dating bake to the days when mechanical arms lifted and lowered to indicate whether the rail ahead was clear.So that one's simple.

●Green meant "caution" at first

    Green's role in lights has actually changed dramatically over time.Its wavelength is next to (and shorter than) yellow's,meaning it's still easier to see than any color other than red and yellow.Back in the early days of railway lights,green originally meant "caution",while the "all-clear" light was,well,clear or white.Trains,of,course,take an unlimitedly long time to stop,and legend has it that several disastrous collisions happened after an engineer mistook stars in the night horizon for an all-clear.Thus,green became "go",and for a long time,railways used only green and red to signal trains.

●Yellow means "caution" because it's almost as easy to see as red

    From the earliest days of motoring up until the mid-1900s,not all stop signs were red-many were yellow, because at night it was all but impossible to see a red stop sign in a poorly lit area.The yellow stop-sign craze began in Detroit in 1915,a city that five years later installed its first electric traffic signal,which happened to include the very first amber traffic light,at the corner of Michigan and Woodward Aves.

    The first Europeans to occupy Canada's Prince Edward Island were the French in the 1500s. At that time, its name was Ile Saint-Jean. When the British took over in 1758, they changed the name to its current one in honor of Prince Edward, the first son of Britain's King George Ⅲ.

    Today many communities find their places in Prince Edward Island, but Charlottetown is the only one that can call itself a metropolitan(大都市)area, despite the fact that it is a small one. About 60,000 people live in the city and surrounding area. The city's center area remains relatively unchanged from its 19th century beginnings. Charlottetown's boardwalk runs alongside the water, past docks, boats, shops and restaurants. Historic homes line the streets. During summer months, costumed characters walk around the city and tell of it history.

    Cavendish beach welcomes beach lovers. The gulf streams makes the water warm and wonderful for swimming, and the island's 1,760-kilometer coastline means a beach is never far away.

    Nine of PEI's 63 lighthouses will welcome visitors in the summer. Besides enjoying stunning views from the tops, visitors can browse in the small museums and learn about the island's history.

The most popular time to visit PE I is July to August, when the average temperature reaches 23℃ during the day. From January to February, the average daytime high is only -3.3℃. Each winter, an average 318.2 centimeters of snow fall on the island, covering it with a white blanket.

    Considering the island's many visitors, it's no surprise that tourism is important there. Other key industries on the island are agriculture, fishing and information technology. With so much to offer, the island is naturally a desirable place to live as well.

    They train four hours a day, often waking up at 4:30 or 5:00 for before-school practices. Their evenings and weekends are eaten up by twice-weekly travel games. Every day is the same; there's no break. No, these aren't Olympic athletes; they're kids.

    The benefits of sports are obvious. So, it's not surprising that, according to CNN, 41 million American children play competitive sports. But when does this become too much of a good thing?

    Seven years ago, a survey in Sporting Kid magazine found 84 percent of athletes' parents had observed belligerent behavior in other parents at games and that 80 percent had been targets of this behavior. What does this say about sports culture, and our culture as a whole? Some parents have become so crazy about their children's winning that they don't stop to think about what example they are setting.

    If athletes are constantly surrounded by adults who scream at coaches and attack sports officials, they may think that this is acceptable behavior. They'll try to win at all costs. In other words, they won't know how to accept defeat, and learn from it.

    The amount of time some athletes spend practicing can be dangerous. According to Sports Illustrated, over 3.5 million athletes younger that 15 suffered from a sports-related injury—that's nearly one in ten! Many injuries cause permanent（永久的）damage if not treated.

    So what can we do about this situation? Some argue that there is no problem, because sports has always been and will always be competitive. But did your grandparents spend hours each day practicing tennis or volleyball? No, they probably played with the neighborhood kids after school, not worrying about winning. All they wanted was to have fun. And that's what we need to change in youth sports—focus on enjoyment.

    A Swiss airplane powered only by energy from the sun left from Abu Dhabi early on March 9. Its creators hope the plane will make the first around-the-world journey without any fuel. The plane is called Solar Impulse 2. It has one seat and is made from carbon fiber. The plane weighs only as much as a car but its wings are wider than a Boeing 747. The plane's wings stretch 72 meters across. Those wings include 17,000 solar units, or cells, which capture the sun's energy. The energy allows the plane to fly day and night.

    Two Swiss scientists built the plane. Bertrand Piccard is also an explorer who made the first non-stop flight around the world in a balloon. Andre Borschberg is an engineer and trained fighter pilot. The scientists say they are not trying to alter the airplane industry. Instead, they want to show that new energy sources and technologies can achieve what some say is impossible. “We want to show we can fly day and night in an aircraft without a drop of fuel.” Mr. Piccard said.

    Some parts of the trip will require the pilots to be in the tiny plane for five to six days and nights in a row. So it is good that the pilot's seat is also a toilet.

    The plane's route begins in the United Arab Emirates. The pilots also plan stops in Oman, India, and China. They will cross the Pacific Ocean, stop in the United States, and continue over southern Europe or North Africa. They plan to arrive back in the United Arab Emirates in late July or early August.

    Internet viewers can go to the Solar Impulse website to see the plane's location and listen to broadcasts from the pilots.

    Nowadays, most people have a device that features artificial intelligence (AI), with the likes of Siri always there to greet us with a friendly voice.

    But Microsoft's XiaoIce is different. Launched in 2014 for the Chinese market, "she" has a creative advantage over her competitors. While most AI assistants simply read out information they get online, XiaoIce has a "realness" that the others are short of. Indeed, if you asked nicely, she could read you a poem from the weekly column in China Daily.

    The newspaper has been printing XiaoIce's self-penned poetry each week since Aug 19, taken from her own book of poems, The Sunlight that Lost the Glass Window.

    To turn XiaoIce into a master of poetry, Microsoft scientists "fed" her the works of over 500 influential modern poets, reported China Daily.

    This led to her figuring out a writing style of her own and creating over 70,000 original poems. Most of the poems are so comparable to those written by humans that they cannot be easily distinguished, and XiaoIce's book even got good feedback from experts.

    "XiaoIce's work carries a strange taste. The more you chew on it, the more interesting it becomes," Scholar Zhang, a literature professor at the Nanjing University of Science and Technology, told China Daily.

    However, it seems not everyone is a fan. "The poems dissatisfied me with their slippery tone and rhythm. The sentences were aimless, lacking the inner logic for emotional expression," Yunnan-based poet Yu told China Youth Daily. This isn't the first AI to attempt poetry. Last year, Google's Parsey McParseface made some poems of its own, although they were branded "wrongly" by reviewers. While it seems like AI is becoming more "intelligent" and less "artificial" all the time, when it comes to creativity, perhaps this is one job that software should leave to us humans.