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.”

    Many Years ago three soldiers,hungry and tired of battle,came upon a small village.The villagers,suffering a bad harvest and the many years of war,quickly hid what little they had to eat and met the three in the village square, shaking their heads and sighing,"Well,we are starving."The soldiers communicated with each other quietly and then the first soldier turned to the villagers.“Your poor fields have left you nothing to share,so we will share what little we have: the secret of making soup from stones.”

    Naturally the villagers were intrigued and soon a fire was built to the village's greatest pot,and then the soldiers dropped in three smooth stones.

“Now this will be a fine soup,”said the second soldier,"but a handful of salt and some parsley（香芹）would make it wonderful!"Up jumped a villager,crying “What a piece of luck!I've just remembered where some has been left!”

    And off she ran,returning with parsley.As the pot was boiling,the memory of the villagers improved: soon carrots,beef and cream had found their way into the great pot.They ate and danced and sang well into the night, thrilled about the feast and their new-found friends.In the morning the three soldiers awoke,finding all the villagers standing before them.At their feet lay a bag of the village's best bread and cheese.“You have given us the greatest gift,”said an elder,“and we shall never forget.”The third soldier turned to the crowd,and said,“There is no secret,but this is certain: people working together can accomplish great things.”At last the light dawned on villagers.Off the soldiers wandered,down the road.

    As the saying goes, “Without music, life would be a mistake.” Music is very important in our lives and here are four of the greatest musicians in history.

    Ludwig van Beethoven(1770-1827)

    Born in Bonn, Germany, Beethoven never held an official position in Vienna. He supported himself by giving concerts, teaching piano, and the sale of his compositions(作曲). The last 30 years of Beethoven's life were filled with a lot of hard times, the first of which was his deafness. Beethoven's music greatly influenced the next generation of musicians.

    Johann Sebastian Bach(1685-1750)

    Bach, “the father of modern music”, was born in Eisenach, Germany. His parents died when he was nine years old, and in 1695 he went to live with his brother Johann Christoph, who was an organist(风琴手) in Ohrdruf. He stayed there until 1700. Seven years later, he moved back to Weimar, where he served as court(宫廷) organist for nine years. His music greatly influenced classical music.

    Frederic Chopin (1810-1849)

    Chopin was born in Zelazowa Wola, Poland. He showed a talent for the piano at a very young age. Chopin began composing when he was still a child, but some of his early works have been lost. He gave his first public concert in 1818. Chopin was considered as the leading musician of his time.

    Franz Schubert(1797-1828)

    Schubert was born and died in Vienna. Unlike most of his predecessors(前辈),Schubert was not a great performer. He never had much money but he was very productive. He wrote his first masterpiece when he was only sixteen. However, he died young, before his talents had even been known.

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    Are you looking for a different place to visit this summer? Why not take a magical trip to an Earth-size planet beyond our solar system with NASA's Planet Travel Center?

    We live in a universe full of planets outside our solar system. Unluckily, even the nearest of those planets are light-years away, so sending spaceships and humans to these attracting worlds remains a distant dream. But on NASA's Planet Exploration website, you can start a journey on an imagined globe of a new world through 360-degree visualization（可视化）. As you land onto each globe's ground, you'll discover amazing views, like the blood-red sky of TRAPPIST-1d, or stand on a moon of the huge planet Kepler-16b, which appears larger than either of the planet's two suns. The view from each planet's ground is an artist's impression based on the limited information that is reachable; no real photos of these planets exist.

    The newest planet with such 360-degree visualization is Kepler-186f, an Earth-size planet rounding a star much cooler and redder than the Sun. “Kepler-186f is also so distant, and it is till now impossible to recognize their atmospheres—if they exist at all—or characterize their atmospheric qualities,” said Martin Still, scientist for NASA's newest space-based planet-hunting program, wondering people's reaction to their creation. “Though with such challenges unsettled, using the NASA visualization tool, you can see how the existence and disappearing of an atmosphere would change the view of the sky from the planet's ground.” Still added.

    Aaron, head of Planet Travel Center, points out that their present and future schedules of the globe visualization will find the nearest planets to our solar system and characterize their atmospheres, bridging the gap between our imagination and what's really out there. In the near future, all the 360-degree visualizations are viewable on desktop and mobile devices, like smartphones, allowing all readers a wonderful enjoyment from the possibilities of a new world.

    These days, tall modern buildings are everywhere. But if you want to see how life was back in the old days, China still has many beautiful water towns to visit. And now, CNN has chosen five of the country's most beautiful ones.

    The village of Zhouzhuang in Jiangsu calls itself the “oldest water town in China”. The village was built in 1086and is crossed with canals. Taking a boat ride through town, the red lanterns might make you think of China's romantic past.

Hongcun in Anhui is 900 years old. It was built to look like a big ox. Huangshan Mountain is the head; the town is the body and the bridges are legs. Hongcun is filled with lakes and beautiful Anhui-style buildings.

    Fenghuang in Hunan doesn't look like a bird, but its name means “phoenix” in Chinese. The town is really as beautiful as the mythical bird. The stilted buildings on each side of the Tuojiang River make the area look like a scene from a postcard.

    Huangyao in Guangxi is known for its natural fengshui. The town lies in a river bend. People say it can prevent the villagers' good fortune from flowing away

    While most water towns are in the south, Shangdong's Tai'erzhuang stands out in the north. The town lies on the bank of the Beijing-Hangzhou Grand Canal. It was a busy trading center during the Ming and Qing dynasties. In the town, there are ancient bridges, a canal and temples, making you think of its past glory.

    Imagine possessing something that you loved so much. Imagine what it would feel like if you lost it. While that item may be something as simple as a doll, you would still feel very upset, but you could replace it with a new one. Now imagine losing something that you depend on for survival and cannot be replaced. That is what it would be like if we lost the natural environment around us.

    Firstly, I believe the environment should be preserved because it supports human life. One of the largest examples is that we get all of our food and drinks from the environment. If the environment were to be destroyed beyond revival, then the human race would be over in months. Scientists have yet to find another planet with similar conditions to the Earth, and if it's found, we don't have the technology to get to that planet on time.

    Secondly, I believe that the environment serves as an amazing educational tool for students. When I was in second grade, I had an absolute interest in animals. When we had a field trip to the Daggerwing Nature Center, I was very excited. When we got there, I could hardly believe what I was seeing. There was a bridge to get to the main building, and under the bridge was a small swamp (沼泽) with turtles, fish, and my personal favorite, alligators. I was so surprised that I almost ran into the tour guide. We walked into the building and saw various animals in their habitats. I was so inspired by this visit. Six years later, I have taken an animal behavior class for three weeks. Meeting by chance with the environment can inspire people, and if preserved it will continue to inspire people.

    In conclusion, the environment is so valuable because it can't be replaced, keeps us alive, and serves as a great educational tool.