Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.

    The gene comes in two versions, one of which is found in 99 percent of Europeans. The other is found in 93 to 100 percent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.

    Scientists have changed the color of a dark-striped zebra-fish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebra-fish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.

    It appears that, like the golden zebra-fish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.

    However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra-fish genes.

    Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.

    But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.

    Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.

    The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.

    What is success?I am not going to try to define success.I think a precise definition is impossible!Is it winning a Gold Medal at the Olympic Games or winning Wimbledon,or being awarded a Nobel Prize?What else?I believe personal success could be anything at all—it does not have to involve public recognition.Who is more successful?A millionaire who is unhappy,or an unnoticed person,who has led a simple,quiet,sincere and happy life?The simplest definition of success,I think,is "to set out to do something and to succeed in doing it".

    The first step on the road to success starts with belief.Believe you can succeed and you will.Achieving success in whatever endeavor（努力）you choose may be the goal of life;because it gives you freedom from worry.Could that be?

Success means different things to every one of us.Some people believe it is measured in financial terms,others believe it is helping others rather than helping themselves.However,most people are motivated to a great extent by public recognition.How many people are really happy?How many people are really doing what they want to with their lives?Incidentally,the ability to imagine makes us different from animals.

    Most important of all,I believe success is a matter of personal growth.If every day you are developing or growing just a millimeter,I believe one is successful.Just being a slightly better person each day for me is success. I've got a very long way to go then!

    Finally,always remember success is a process and is not simply a matter of arriving at a destination.It's the journey that really matters.Success is what you become in the often very difficult and dangerous journey down the river of life.

    The boss of a big company needed to call one of his employees about a serious problem with one of the main computers.

    He dialed the employee's home phone number and was greeted with a child's whisper, "Hello?" The boss asked, "Is your daddy at home?" "Yes," whispered the small voice. "May I talk with him?" The man asked.

    To the surprise of the boss, the small voice whispered, "No." Wanting to talk with an adult, the boss asked, "Is your mommy there?" "Yes," came the answer. "May I talk with her?" Again the small voice whispered, "No."

    Knowing that it was impossible that a young child would be left home alone, the boss decided he would just leave a message with the person who should be there watching over the child. "Is there anyone there besides you?" The boss asked the child. "Yes," whispered the child, "a policeman."

    Wondering what a policeman would be doing at his employee's home, the boss asked, "May I speak with the policeman?"

    "No, he's busy," whispered the child. "Busy doing what?" asked the boss. "Talking to daddy and mommy and the fireman," came the whispered answer.

    Growing concerned and even worried as he heard what sounded like a helicopter(直升机)through the earpiece on the phone, the boss asked, "What is the noise?" "A helicopter." answered the whispered voice. "What is going on there?" asked the boss, now alarmed.

    In a serious whispering voice the child answered, "The search team just landed the helicopter." Alarmed and concerned and more than just a little disappointed, the boss asked, "Why are they there?" Still whispering, the young voice replied along with an unclear giggly(窃笑), "They are looking for me."

    In 1812, the year Charles Dickens was born, there were 66 novels published in Britain. People had been writing novels for a century—most experts date the first novel to Robinson Crusoe in 1719—but nobody wanted to do it professionally. The steam-powered printing press was still in its early stages; the literacy（识字） rate in England was under 50%. Many works of fiction appeared without the names of the authors, often with something like “By a lady.”Novels, for the most part, were looked upon as silly, immoral, or just plain bad.

    In 1870, when Dickens died, the world mourned him as its first professional writer and publisher, famous and beloved, who had led an explosion in both the publication of novels and their readership and whose characters — from Oliver Twist to Tiny Tim— were held up as moral touchstones. Today Dickens' greatness is unchallenged. Removing him from the pantheon（名人堂） of English literature would make about as much sense as the Louvre selling off the Mona Lisa.

    How did Dickens get to the top? For all the feelings readers attach to stories, literature is a numbers game, and the test of time is extremely difficult to pass. Some 60,000 novels were published during the Victorian age, from 1837 to1901; today a casual reader might be able to name a half-dozen of them. It's partly true that Dickens' style of writing attracted audiences from all walks of life. It's partly that his writings rode a wave of social, political and scientific progress. But it's also that he rewrote the culture of literature and put himself at the center. No one will ever know what mix of talent, ambition, energy and luck made Dickens such a singular writer. But as the 200th anniversary of his birth approaches, it is possible — and important for our own culture—to understand how he made himself a lasting one.

    A company in San Francisco, California, has found a way to turn used plastic bottles into women's shoes.

    Every day, millions of Americans drink water and other liquids from plastic bottles. More than 60 million of them are thrown away each day. Many of the plastic bottles end up in landfills or are burned with other waste products.

    A San Francisco start-up company called Rothy's, however, turns this plastic waste into environmentally friendly shoes. Roth Martin is the company's co-founder. He explains how they turn plastic into soft material for women's feet. They take the plastic, clean it, and break it down into small pieces. Then they press them through a device that makes soft fibers. Those fibers arc then combined together. This is done by a 3D machine. It is designed to reduce waste while making the shoes. The knitted stuff and the inner part of the shoe arc then attached to the shoe's outer part, called the sole (鞋底).This outer sole is also made from environmentally friendly material: responsibly responsibly sourced no-carbon rubber.

    Rolhy's shoes are sold online. They are flat shoes, with either a rounded or pointed toe. They come in different colors and designs. They cost either $ 125 or $ 145 per pair, depending on the design. After American actress Gwyneth Paltrow discovered them last year, the demand for the shoes grew. Martin says there is no shortage of material to fill that demand. "We're not going to run out of water bottles any time soon. So we have a limitless supply of material, and I think that is a good sign for our future." When the environmentally friendly shoes wear out, customers can return them at no cost to a company that uses the recycled material to make other products.

    For now, the shoes are only available to be shipped in the United States. However, the company says it will add international shipping in the near future.

    For the past few months, my three-year-old daughter has spent an hour every week learning a foreign language. She walks into a small room in a local school, where she and a handful of three and four-year-old spend the next hour dancing to ^“La Vaca Lola”, a song about a Spanish cow, creating finger puppets(木偶) to voice what they like and don't like (me gusta, no me gusta) and shouting out which animals are big (grande) or small (pequeno).

    She tells us little about the classes. In fact, for the first few weeks, nothing at all. I begin to wonder if it was a huge mistake (each lesson works out at about £9) but then I show her “La Vaca Lola” on YouTube. She shouts vaca with enthusiasm and with what I hope is a Spanish accent.

    The wish to enroll(使……加入) her in language lessons came, like most things, gradually and then in a sudden rush. In my day job, I read and edit stories about the Chinese economy. For a long time, I felt that it would be good for her to learn another language but I had no great plan as to when.

    Then I read Edward Luce's The Retreat of Western Liberalism and all my thoughts and worry about the economy combined into a panic. Waking in a sweat, it seemed obvious that if my daughter was to have any kind of future, she would have to learn another language. Ideally (理想地) immediately.

    I thought about Mandarin Chinese, one of the top 10 languages most important for our future, according to the British Council (others include Arabic, French, German, Portuguese, Italian, Russian, Dutch and Japanese). But there were no classes for young children nearby. There were, however, local Spanish classes—the number-one language on the list. When she started to sing "Incy Wincy Spider" in Spanish and English—helped by a Spanish nursery worker-our decision was made.