The African elephant, which is the largest land animal remaining on earth, is of great importance to African ecosystem. Unlike other animals, the African elephant is to a great extent the builder of its environment. As a big plant-eater, it largely shapes the- forest-and-savanna (大草原) surroundings in which it lives, therefore setting the terms of existence for millions of other animals that live in its habitat.

    It is the elephant's great desire for food that makes it a disturber of the environment and an important builder of its habitat. In its continuous search for the 300 pounds of plants it must have every day, it kills small trees and under-bushes, and pulls branches off big trees. This results in numerous open spaces in both deep tropical forests and in the woodlands that cover part of the African savannas. In these open spaces are numerous plants in various stages of growth that attract a variety of other plant-eaters.

    Take the rain forests for example. In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor. By pulling down trees and eating plants, elephants make open spaces, allowing new plants to grow on the forest floor. In such situations, the forests become suitable for large hoofed plant-eaters to move around and for small plant-eaters to get their food as well.

    What worries scientists now is that the African elephant has become an endangered species. If the elephant disappears, scientists say, many other animals will also disappear from vast areas of forest and savanna, greatly changing and worsening the whole ecosystem.

    A famous teacher was speaking to the students at our school. He began his lesson by holding up a ￡100 bill. Then he said to the three hundred students, "Who would like to have this ￡100 bill?" The students began to put up their hands at once.

    Then he said, "I am going to give this bill to one of you, but first, let me do this." He then made this bill into a ball. Then he said, "Who wants it?" Hands went into the air.

    "Well," he said, "What if I do this?" and he dropped it on the floor and stepped on it. He picked up the dirty, crumpled bill and said, "Who still wants it?" Hands went back into the air.

    "My friends," he said, "You've learned a valuable lesson today. No matter what I did to the money, you still wanted it because it didn't go down in value. It was still worth ￡100.”

     “Many times in our lives, we're dropped, crumpled, and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember, no matter what has happened to you, you will never lose your value: you are always valuable to those who love you. Your value doesn't come from what you drop or whom you know, but WHO YOU ARE.”

    You are special and valuable. Don't ever forget it!

    Where will you go to escape the stress of life and the noise of traffic? To find out, we turned to question-and-answer site Quora, where users have been sharing their opinions. From an Alpine palace in Germany to some amazing English views, these dreamy destinations are so magical that it's hard to believe they're real.

    Gaudi's otherworldly imagination

    Designed by one of Spain's most famous architects, Antoni Gauldi, the Roman Catholic church Sagrada Familia is a legend in itself Construction began in 1882, but less than a quarter of the project was complete when Gaudi died in 1926. Since then, work has progressed slowly. How about the ending? Architects plan to complete the project in 2026, the centenary of Gaudi's death.

    As Barcelona's most popular tourist site, Sagrada Familia attracts three million visitors every year for one good reason: It's a masterpiece unlike anything else in the world which is largely responsible for the city's lively personality.

    A setting that could steal the spotlight from any storybook hero

    With its valleys surrounded by lakes, rivers, hills and peaks, the Lake District in England's northwest is quite literally taken out of fairy tales. This place was Beatrix Potter's inspiration for Peter Rabbit and the residence（居所）of the Lake Poets, including William Wordsworth, Samuel Taylor Coleridge and Robert Southey.

    One of nature's most magical illusions

    Once upon a time in the faraway land of the Faroe Islands, Lake Leitisvatn became known as the most striking of all the islands' lakes. At more than 6km long, it is the biggest in the Faroe Islands. In reality, Lake Leitisvatn is actually no more than about 30m above sea level. A steep cliff in front of the lake and a clever camera angle make the lake appear to be much higher than it really is.

    Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

    Sometimes, the word "green" means young, fresh and growing. For example, a greenhorn is someone who has no experience. In the 15th century, a greenhorn was a young cow or an ox whose horns(角)had not yet developed. A century later, a greenhorn was a soldier who had no experience in war. By the 18th century, a greenhorn had the meaning it has today—a person who is new in a job.

    Someone who is good at growing plants is said to have a green thumb(大拇指). The expression comes from the early 20th century. A person with a green thumb can make plants grow quickly and well.

    Green is also the color used to describe the powerful feeling , jealousy(嫉妒). The green-eyed monster （怪物）is not a dangerous animal from outer space. It is an expression used about 400 years ago by the British writer William Shakespeare in his play "Othello". It describes the unpleasant feeling when someone has something he wants. For example, a young man may suffer from the green-eyed monster if you get a pay rise and he does not.

    In most places in the world, a green light means to move ahead. In everyday speech, a green light means agree to continue with a project.

    Ivy Granstrom

    Ivy Granstrom was born with impaired vision(弱视) and got a serious back injury at the age of 60 during a car accident. She participated in cold English Bay swimming events for 76 years and was therefore sometimes known as the Queen of the Polar Bear Swims.

    Gerry Hewson

    Gerry Hewson was a member of Australian Men's National Wheelchair Basketball Team. He won a gold medal in the 1996 Summer Paralympics. He coached for the West Sydney Razorbacks from 2004 to 2006.He was named as a lifetime member in recognition of the efforts he made for the promotion of wheelchair basketball. Discussing the appeal of wheelchair basketball, he commented that,“There is a coating at the edge of the rim(轮辋) that actually lights up like a spark(火花), and it stays for about two to three seconds. That is quite exciting and great fun.”

    April Holmes

    April Holmes lost her left leg below the knee because of a train accident in 2001. Remembering it she said, “I had a life-changing accident in January, 2001. And fortunately I have been able to get back to doing what I love, and that's track and field.” Through hard work, she made records in the 100, 200, and 400 meter events. To live her life to its full potential, she has set up a non-profit(非营利的) organization, the April Holmes Foundation, to help people with learning or physical disabilities while being a role model for them.

    Shauna Maria Whyte

    Shauna Maria Whyte was born in Canada in 1967. She has won many prizes in cross-country skiing competitions since 1975. In 1991, during a horseback riding competition, Shauna broke her back. She did not surrender to this change in her life, and she started using a sit sled(雪橇).

    You've heard of the fat suit and the pregnancy suit; now meet AGNES—the old person suit.

    AGNES stands for “Age Gain Now Empathy(换位体验)System” and was designed by researchers at MIT's AgeLab to let you know what it feels like—physically—to be 75 years old. “The business of old age demands new tools,” said Joseph Coughlin, director of the AgeLab. “While focus groups and observations and surveys can help you understand what the older consumer needs and wants, young marketers never get that Ah ha! moment of having difficulty opening a jar, or getting in and out of a car. That's what AGNES provides. ”

    Coughlin and his team carefully adjusted the suit to make the wearer just as uncomfortable as an old person who has spent a lifetime eating poorly and not doing much exercise. Special shoes provide a feeling of imbalance, while braces on the knees and elbows limit joint mobility. Gloves give the feeling of decreased strength and mobility in the hands and wrists, and earplugs make it difficult to hear high—pitched sounds and soft tones. A helmet with straps(带)attached to it presses the spine(脊柱), and more straps attached to the shoes decrease hamstring flexibility, and shortens the wearer's step.

    AGNES has been used most recently by a group of students working on a design of an updated walker. By wearing the suit they could see for themselves what design and materials would make the most sense for a physically limited older person. Coughlin said the suit has also been used by clothing companies, car companies and retail goods companies to help them understand the limitations of an older consumer.

    “AGNES is not the destiny of everybody,” he said. “She is a badly behaved lady who didn't eat and exercise very well. A secondary benefit we've found with AGNES is that it has become a powerful tool to get younger people to invest in their long-term health. ”