As we know, DNA testing is very useful for crime fighting. But now crime fighters could have a new tool at hand. Researchers have developed a cutting-edge (前沿的) technique to identify human hair. Their test is quicker than DNA analysis techniques currently used by the police.

    DNA testing is commonly used for identification because DNA is unique to each individual. However, environmental and chemical processes can degrade(降解) DNA, limiting its usefulness over time. Protein (蛋白质) in hair, on the other hand, is more stable than DNA but can also have variations (变异体) that may be unique to the individual.

     “Our analysis process can be used universally,” says Ms. Huang, “One of our samples even included dyed hair and the test was 100 per cent accurate. The test was able to distinguish East Asians, Caucasians and South Asians.”

    Dr. Beauchemin says she has got in touch with law enforcement agencies about using the new technology. She is also planning to collect more hair samples and continue her research with a goal of finding where exactly in the world hair sample is from, to look for more races and determine specific age.

     “We are in a very similar place with protein-based identification to where DNA testing was during the early days of development,” said chemist Brad Hart. “This method will be a game-changer, and while we've made a lot of progress toward improving it, there are steps to go before this new technique is able to reach its full potential.”

    Maybe it is true that we do not know what we have got until we lose it,but it is also true that we do not know what we have been missing until it arrives.

    It takes an hour to like someone,and a day to love someone,but it takes a lifetime to forget someone.Giving someone all your love is never an assurance that they will love you back.Do not expect love in return;but if it does not,be content it has grown in yours.Do not rely on one's appearance;it can trick you.Do not rely on wealth;even that fades away.Rely on someone who makes you smile,because it takes only a smile to make a dark day seem bright.

    There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them.Dream what you want to dream;go where you want to go;be what you want to be,because you have only one life and one chance to do all the things you want to do.

    The brightest future will always be based on a forgotten past.You cannot go on well in life until you let your past failures and heartaches go off.May you have enough happiness to make you sweet,enough trails to make you strong,enough sorrow to keep you human,enough hope to make you happy.The happiest of people do not necessarily have the best of everything;they just make the most of everything that comes along their way.Happiness waits for those who cry,those appreciate the importance of people who have touched their lives.Always put yourself in others' shoes.If you feel that it hurts you,it probably hurts the other person,too.

    When you were born,you were crying and everyone around you was smiling.Live your life so that when you die, you are the one who is smiling and everyone around you is crying.

    Thirteen-year-old American Jessica Goldstone wants to be a fashion designer when she finishes school. She thinks her designs would be more exciting than clothes bought from stores. But until this month, Jessica has never touched a sewing machine(缝纫机).

    After her first class, Jessica and six other girls aged 9 to 13 said that sewing was fun, cool and challenging.

    These students at Fabrics' Sew Fun class show that the sewing machine is becoming popular again.

    "There have been a lot of teens getting excited about sewing," said a sewing company worker Donna Smith. "Some of them come from the Project Runway TV show," she said. This TV show is an exciting weekly contest to make a great fashion designer. Every week one contestant (参赛者) fails the test and has to leave the contest.

    The number of people who joined sewing class summer camps grew by 10 percent this year. That's good news for companies that make sewing machines and publish sewing magazines. The Singer Sewing Company sold nearly 3 million sewing machines in the United States last year. This is about twice as many as in 1999.

    Sewing machines have been around for more than 150 years, but they have changed a lot since your grandmother was a girl.

    Spencer Carmel started sewing lessons after getting a sewing machine for her 11^th birthday. She has sewn a lot by hand, but she wants to make more difficult things. Spencer's class recently made hats.

    Another member of the class, Kelsey Oen, 9 years old, needed time to get used to her machine, but soon she could use it well. By the end of the class, Kelsey was happy and wearing her new hat.

    Darwin noted that some human emotional expressions might have started as part of a physiological function: for example, exposing the teeth to bite food. The function, however, took on meaning and became a form of communication which signals anger.

    The same may be true for the animals. Baby monkeys cry for attention. They also cry to signal to an adult that they want to be carried.

    “Chimpanzees do make upset voice when they are being weaned (断奶) by their mothers or have lost their mothers or another individual,” says Anne Pusey, a professor at the University of Minnesota. “They whimper (呜咽) and cry and scream. When we hear these calls, the emotion involved seems obvious. However, they do not weep in the sense of producing tears. I have seen an adolescent male whimpering when he lost sight of his older brother with whom he had been traveling.”

    Babies of many mammalian species, including rats, cry. Moreover, when a baby rat cries, often his mother brings the fallen pup back into the nest. This is probably a straightforward communication, as it is with humans. However, psychologists at the University of Iowa aren't convinced.

    The Iowan researchers can cause the same crying sounds by producing large decreases and then increases in blood flow. The blood flow also goes down when baby rats get cold. Thus, they conclude baby rats cry in the same way that we sneeze. Of course the rat baby could be crying because he's cold and wants his mother to know.

    “All young mammals make cries when separated from their mother,” says Jaak Panksepp, a psychologist at Bowling Green State University. “If you're willing to call this crying, then certainly other animals show this emotional response.” he says, “Some of us take seriously that animals do have emotions.”

    The flowers are blooming and the birds are singing as Melinda sits in the rose garden of the nursing home. She is recalling old times as she waits for her family's arrival. The nursing home has been Melinda's new settlement ever since Thomas passed away a week ago. Thomas had fought a long and hard battle against lung cancer for three years. Unfortunately, he has broken the promise that he and Melinda had made: to be with each other for every birthday. Melinda knew this was unrealistic (不现实的) but agreed to the promise for Thomas's sake.

    "Thomas, you are completely a dreamerl" Melinda shouted to Thomas as he dragged on about living on an island with his beautiful wife. That's what she loved about him most-he had a vivid imagination. They got married at age eighteen and began having children right away. Mary came within the year, followed by Thomas Benjamin II, Lilly-Ann, and Joseph "Little Joey" George. The family lived an exultant life filled with laughter and love.

    "Mom!" Lilly shouted, but it really sounded like a howl. Melinda had lost herself in thinking about the life she had shared with her late husband. Lilly pushed her down the long dark halls of the nursing home until they arrived at the recreational room.

    When the doors opened, Melinda put her hand over her mouth and was completely speechless. The room was crowded with the people nearest and dearest to her and the warmth and love was felt instantly. The night went on; stories and cocktails were shared and everything was perfect.

    However, when Melinda caught a moment to herself she looked around at her family. With a smile on her face, she raised her Manhattan and called out for a toast. "This one is for you, Thomas, though you are not here."

    You've probably heard such reports. The number of college students majoring in the humanities (人文学科) is decreasing quickly. The news has caused a flood of high-minded essays criticizing the development as a symbol of American decline.

    The bright side is this: The destruction of the humanities is, finally, coming to an end. No more will literature, as part of an academic curriculum, put out the light of literature. No longer will the reading of, say, "King Lear" or D.H. Lawrence's "Women in Love" result in the annoying stuff of multiple-choice quizzes, exam essays and homework assignments.

    The discouraging fact is that for every college professor who made Shakespeare or Lawrence come alive for the lucky few, there were countless others who made the reading of literary masterpieces seem like two hours in the dentist's chair.

    The remarkably insignificant fact that, a half-century ago, 14% of the undergraduate population majored in the humanities (mostly in literature, but also in art, philosophy, history, classics and religion) as opposed to 7% today has given rise to serious reflections on the nature and purpose of an education in the liberal arts.

    Such reflections always come to the same conclusion: We are told that the lack of a formal education, mostly in literature, leads to numerous harmful personal conditions, such as the inability to think critically, to write clearly, to be curious about other people and places, to engage with great literature after graduation, to recognize truth, beauty and goodness.

    Literature changed my life long before I began to study it in college. Books took me far from myself into experiences that had nothing to do with my life, yet spoke to my life. But once in the college classroom, this precious, alternate life inside me got thrown back into that dimension of my existence that bored me. Homer, Chekhov and Yeats were reduced to right and wrong answers, clear-cut themes and clever interpretations. If there is anything to worry about, it should be the disappearance of what used to be an important part of every high-school education: the literature survey course, where books were not academically taught but thoroughly introduced—an experience unaffected by stupid commentary and useless testing.

    The literary classics are places of quiet, useless stillness in a world that despises (鄙视) any activity that is not profitable or productive. Literature is too sacred to be taught. It needs only to be read.

    Soon, if all goes well and literature at last disappears from the undergraduate curriculum—my fingers are crossed—increasing numbers of people will be able to say that reading the literary masterworks of the past outside the college classroom, simply in the course of living, was, in fact, their college classroom.