Mark Twain has been called the inventor of the American novel. And he surely deserves additional praise: the man who popularized the clever literary attack on racism.

    I say clever because anti-slavery fiction had been the important part of the literature in the years before the Civil War. H. B. Stowe's Uncle Tom's Cabin is only the most famous example. These early stories dealt directly with slavery. With minor exceptions, Twain planted his attacks on slavery and prejudice into tales that were on the surface about something else entirely. He drew his readers into the argument by drawing them into the story.

    Again and again, in the postwar years, Twain seemed forced to deal with the challenge of race. Consider the most controversial, at least today, of Twain's novels, Adventures of Huckleberry Finn. Only a few books have been kicked off the shelves as often as Huckleberry Finn, Twain's most widely read tale. Once upon a time, people hated the book because it struck them as rude. Twain himself wrote that those who banned the book considered the novel “trash and suitable only for the slums (贫民窟).” More recently the book has been attacked because of the character Jim, the escaped slave, and many occurences of the word nigger. (The term Nigger Jim, for which the novel is often severely criticized, never appears in it.)

    But the attacks were and are silly—and miss the point. The novel is strongly anti-slavery. Jim's search through the slave states for the family from whom he has been forcibly parted is heroic. As J. Chadwick has pointed out, the character of Jim was a first in American fiction—a recognition that the slave had two personalities, “the voice of survival within a white slave culture and the voice of the individual: Jim, the father and the man.”

    There is much more. Twain's mystery novel Pudd'nhead Wilson stood as a challenge to the racial beliefs of even many of the liberals of his day. Written at a time when the accepted wisdom held Negroes to be inferior (低等的) to whites, especially in intelligence, Twain's tale centered in part around two babies switched at birth. A slave gave birth to her master's baby and, for fear that the child should be sold South, switched him for the master's baby by his wife. The slave's lightskinned child was taken to be white and grew up with both the attitudes and the education of the slave-holding class. The master's wife's baby was taken for black and grew up with the attitudes and intonations of the slave.

    The point was difficult to miss: nurture (养育), not nature, was the key to social status. The features of the black man that provided the stuff of prejudice—manner of speech, for example— were, to Twain, indicative of nothing other than the conditioning that slavery forced on its victims.

    Twain's racial tone was not perfect. One is left uneasy, for example, by the lengthy passage in his autobiography (自传) about how much he loved what were called “nigger shows” in his youth—mostly with white men performing in black-face—and his delight in getting his mother to laugh at them. Yet there is no reason to think Twain saw the shows as representing reality. His frequent attacks on slavery and prejudice suggest his keen awareness thattheydid not.

    Was Twain a racist? Asking the question in the 21st century is as wise as asking the same of Lincoln. If we read the words and attitudes of the past through the “wisdom” of the considered moral judgments of the present, we will find nothing but error. Lincoln, who believed the black man the inferior of the white, fought and won a war to free him. And Twain, raised in a slave state, briefly a soldier, and inventor of Jim, may have done more to anger the nation over racial injustice and awaken its collective conscience than any other novelist in the past century.

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    Typing with one hand when the other one is occupied can be a real pain, so imagine having to type with just one foot. It's got to be a nightmare, but 21-year-old Hu Huiyuan from China's Anhui Province is using her only functional foot to write not just a few sentences, but an entire fiction novel!

    Born prematurely(过早地), Hu was diagnosed with cerebral palsy(脑瘫) when she was only 10 months old. This left her permanently paralyzed—the only parts of her body she can move are her head and left foot. As she grew older, she learned how to perform everyday tasks using her foot.

    Despite not having received formal education, Hu is surprisingly well-spoken. Over the years, with the help of her mother, she taught herself to read and write. “I'm not a genius, but I'm very focused,” she said, modestly. “When I watched TV in my childhood, I often learned words on the screen.”

    “When I was teaching her how to speak, I had to repeat every single word a thousand times before she got it, ”Hu's mother said. “But once she mastered the word. I felt satisfied.”

    With time going by, Hu's language got so proficient that she set out to write a story about the pursuit of dreams and love. She's doing this by typing out every single word on her computer using only one foot.

    In spite of all these setbacks, Hu is able to type 20 to 30 words a minute. She has already written six chapters—that's 60,000 words—and says she only has two more chapters to go before the novel is complete.

    Getting rid of dirt, in the opinion of most people, is a good thing. However, there is nothing fixed about attitudes to dirt.

    In the early 16^th century, people thought that dirt on the skin was a means to block out disease, as medical opinion had it that washing off dirt with hot water could open up the skin and let ills in. A particular danger was thought to lie in public baths. By 1538, the French king had closed the bath houses in his kingdom. So did the king of England in 1546. Thus began a long time when the rich and the poor in Europe lived with dirt in a friendly way. Henry IV, King of France, was famously dirty. Upon learning that a nobleman had taken a bath, the king ordered that, to avoid the attack of disease, the nobleman should not go out.

    Though the belief in the merit of dirt was long-lived, dirt has no longer been regarded as a nice neighbor ever since the 18^th century. Scientifically speaking, cleaning away dirt is good to health. Clean water supply and hand washing are practical means of preventing disease. Yet, it seems that standards of cleanliness have moved beyond science since World War Ⅱ. Advertisements repeatedly sell the idea; clothes need to be whiter than white, cloths ever softer, surfaces to shine. Has the hate for dirt, however, gone too far?

    Attitudes to dirt still differ hugely nowadays. Many first-time parents nervously try to warn their children off touching dirt, which might be responsible for the spread of disease. On the contrary, Mary Ruebush, an American immunologist(免疫学家)，encourages children to play in the dirt to build up a strong immune system. And the latter position is gaining some ground.

    "Hope has proved a powerful predictor of outcome in every study we've done so far," said Dr. Snyder, a psychologist.

    In research with 3,920 college students, Dr. Snyder found that the level of hope among freshmen at the beginning of their first term was a more accurate predictor of their college grades than were their S.A.T. scores or their grade point averages in high school. "Students with high hope set themselves higher goals and know how to work to attain them," Dr. Snyder said. "When you compare students with equal learning ability and past school achievements, what sets them apart is hope."

    In seeking a way to assess hope scientifically, Dr. Snyder went beyond the usual belief that hope is merely the sense that everything will turn out all right. "This idea is not concrete enough; it fails to clarify two key components of hope," Dr. Snyder said.

    "Having hope means believing you have both the will and the way to accomplish your goals, whatever they may be."

    Despite the wisdom in the old saying "where there's a will there's a way," Dr. Snyder has found that the two are not necessarily connected. In a study of people from 18 to 70 years old, Dr. Snyder discovered: only about 40% of people are hopeful in the technical sense of believing they typically have the energy and means to accomplish their goals; about 20% of the people believed in their ability to find the means to attain their goals, but said they had little will to do so; another 20% have the opposite pattern, saying they had the energy to motivate themselves but little confidence that they would find the means; the rest had little hope at all, reporting that they typically had neither the will nor the way.

    "It's not enough just to have the wish for something," said Dr. Snyder. "You need the means, too. On the other hand, all the skills to solve a problem won't help without the willpower to do it."

    You may probably meet most of the powerful graduation speakers, here who are well-known people in their fields. I think the schools couldn't have picked better speakers than them, because they set good examples, deeply inspiring us in our daily life.

    1）Steve Jobs, Stanford University:

   "Remembering you're going to die, and the best way I know is to avoid the trap of thinking that you have something to lose. There is no reason not to follow your heart. Your tine is limited, so don't waste it living someone else's life. Don't let the noise of others' opinions drown out your own inner voice. …"

    2）Oprah Winfrey, Stanford University：

   "I consider the world, this Earth, to be like a school. And the secret I've learned to get ahead is being open to the lessons from the grandest universe of all. Don't react against a bad situation. And the solution will arise from the challenge. So don't give up easily, acting with responsibility. …"

    3）Bono, University of Pennsylvania：

   "For four years you've been buying, trading, and selling everything you've got in his market-place of ideas. Your pockets are full, even if your parent's are empty, and now you've got to figure out what to spend it on…The world is more flexible than you think and it's waiting for you to hammer it into shape…"

    4）Michael Del, University of Texas at Austin;

   "Now it's time for you to move on to what's next and obtain your desire. But you much must not let anything prevent you from taking those first steps. Don't spend so much time trying to choose the perfect opportunity, or sometimes you'll miss the right opportunity. Recognize that there will be failures obstacles. But you will learn from your mistakes and the mistakes of others."