As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without any living things.

    Pollution in water is not simply a matter of “poisons” killing large numbers of fish overnight, Very often the effects of pollution are not noticed for many months or years because the first organisms（生物体）to be affected are either plants or plankton. But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die too. In this way a whole food chain can be wiped out, and it's not until dead fish and water birds are seen at the river's edge or on the seashore that people realize what is happening.

    Where do the substances which pollute the water come from? There are two main sources of sewage（污水）and industrial waste . As more detergent（洗涤剂）is used in the home, so more of it is finally put into our rivers, lakes and seas . Detergents harm water birds, dissolving the natural substances which keep their feathers water - proof. Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful as there are many highly poisonous things in it, such as copper and lead（铅）.

    So, if we want to stop this pollution, the answer is simple: sewage and industrial waste must be made clear before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

    After the examination, the doctor told my parents my sight would get worse and that I would lose my sight finally. On the way home from hospital, no one said a word. One day, would I only imagine the scenery beyond the glass rather than see it?

    That September, I entered middle school. Most nights I had homework that included an armful of books to read. To keep up with other children, I took great trouble to finish the task. With my nose a couple of inches from the page, I was tired easily. What's worse, after I had read several pages on my own, the words slipped off the page into inky pools.

    However, then I did not have audio books and electric devices like kids do now. Instead, Mum volunteered to read out loud. Mum worked part-time, cleaned the house, cooked and spent time with Grandma. In spite of being so busy, she showed up in my room like clockwork. She put on her reading glasses. Mum always thought those glasses made her look old. To me, she looked like a teacher.

    In my room, Mum's voice raced with the ticking of the clock. Being forced to focus on listening, I found a way to keep my marks up and compete with the other kids. When the teacher asked a question, I raised my hand with confidence. Teachers praised me for having a good memory. Reading removed my fear for my failing sight, reading also made me curious about other people's challenges and how they managed. Though I could not use my eyes to fix on each passage, my mind lit up with every new book.

    True to what the doctor said, the worst came, but thanks to Mum, my sense of hearing now allows me to “see”. This was the most precious gift from a mother to her child.

    Archerfish(射水鱼), a species famous for spitting (吐) water to shoot insects out of the air, can recognize one human face from another.

    In the laboratory, instead of shooting insects, the fish were taught to spit at pictures of human faces showed on a computer screen outside their aquarium. The fish were first introduced to two faces, and taught to spit at one of them in exchange for a food reward. The researchers then tested whether the fish would recognize and spit at the face they had learned from among 44 new ones. And they were right more than 80% of the time.

    To the researchers' surprise, even when they did that with faces that were in black and white, the fish were still able to find the face they were trained to recognize.

    Telling one human face from another is a surprisingly difficult task. As we all have two eyes above a nose and a mouth, doing so depends on recognizing some extremely small differences.

    “It has been supposed that this task is so difficult that it can only be completed by higher animals, which have a large and complex brain,” said Newport, whose study was published in the journal Scientific Reports. “But the archerfish were able to do this without having a neocortex, the most recently developed part of the brain. In humans, the neocortex governs our sense and language.”

    “Fish have a simpler brain than humans and they don't have the section of the brain that humans use for recognizing faces,” Newport said. “Even though, many fish show amazing visual (视力的) behaviors and therefore make the perfect subjects to test whether simple brains can complete complex tasks.”

    John Michael Thomas, 14, Florida

When John Michael Thomas decided to honor his friend and classmate Elizabeth Buckley, who died from cancer, he remembered how much she loved peacocks(孔雀).

He wanted to build a lifesized peacock fountain(喷泉) in Elizabeth's favorite park in the city. He thought it could be a place for people to relax and be inspired.

    John Michael raised $52,000 to build the fountain.

    Barrett England, 13, Utah

    The wheels began to turn for Barrett England when he heard about Karma Bike Shop, a place where young people can earn a free bike by reading and performing community(社区) service.

    Barrett visited Karma's owner with his idea: He would collect and repair used bikes and donate(捐赠) them to the shop.

    He expected to get about 10 donated bikes. In the end, Barrett received 39.

Zachary Blohm, 15, Wisconsin

    The 25­year­old playground at an elementary school near Milwaukee, Wis., was so small that only 70 of its 575 students could play on it at a time.

    That's when Zachary Blohm saved the day: He and some volunteers built a huge playground. To raise money, Zac planned T-­shirt and bake sales, sold tickets and more. He held monthly money­raising events for more than a year. Overall, he collected $130,000—enough to finish his project.

    Jack Zimmerman, 16, New Jersey

    For some people, finding a meal is as simple as opening the refrigerator. For more than 366,000 hungry kids in New Jersey, it's not that easy.

    That fact didn't sit well with Jack Zimmerman, who organized a drive to lessen childhood hunger in his state. His goal: create 40,000 packaged meals that could be donated to those in need. On game day, Jack and his volunteers started their work. After the final count, the team had packaged 47,124 meals—well above Jack's goal.

Washington, D.C. Bicycle Tours

    Cherry Blossom Bike Tour in Washington, D.C.

    Duration: 3 hours

    This small group bike tour is a fantastic way to see the world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability—and the cherry blossoms—disappear!

    Washington Capital Monuments Bicycle Tour

    Duration: 3 hours (4 miles)

    Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water.

    Capital City Bike Tour in Washington, D.C.

    Duration: 3 hours

    Morning or Afternoon, this bike tour is the perfect tour for D.C. newcomers and locals looking to experience Washington, D.C. in a healthy way with minimum effort. Knowledgeable guides will entertain you with the most interesting stories about Presidents, Congress, memorials, and parks. Comfortable bikes and a smooth tour route (路线) make cycling between the sites fun and relaxing.

    Washington Capital Sites at Night Bicycle Tour

    Duration: 3 hours (7 miles)

    Join a small group bike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as you bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All riders are equipped with reflective vests and safety lights.

    Thirteen hours later we just arrived in Paris after many dramas (戏剧性事件).

    I rented a car, filled it up and moved ahead to Bristol airport that morning. We set off at 8:00 a.m. and all was going well until we got to the turn for Bristol airport. The airport sign (指示牌) suggested we went out from the M5, but Suri asked me to continue going straight ahead, so against my better judgment, I let the airport turn pass us by.

    Next we left for South Wales, the car was back and we had a plane to Paris to catch in a couple of hours. It was about then that I realized we were heading for Wales on a six­road highway. I felt very bad. We turned off the highway and turned into a country road, as directed by Suri and there was a sign saying that the road to the airport was closed. I saw a lady watering her garden and asked her about the best way to the airport. She said we were at least 30 minutes from the airport, but she couldn't help us with the right directions (方向).

    I was so worried as we really were out in the country without any guidance. All I could think of was to turn Suri off and follow the signs myself.

    Then finally after many butterflies in the stomach and feeling like my heart was going to burst (爆裂) out of my chest, there was a proper green sign to the airport and we followed it with so much joy.

    Driving from the airport into Paris was a shock, Lots of homeless people were sleeping under the highways with rubbish everywhere.

Anyway we're now in Paris. The experience of getting lost is now almost laughable. In another 24 hours will be my 50th birthday. I have a big party planned for myself in Paris.