For a year and half, kids sent hurtful messages like “You are ugly.” or “Why are you still alive?” to Rebecca Sedwick. In 2013, Rebecca, then 12, couldn't stand it anymore. She took her own life near her home in Florida. Soon afterward, Trisha Prabhu read about the story. “I was surprised and heart-broken,” said Trisha, now 15, who is from Naperville, Illinois, “I know that I had to do something to stop this from ever happening again.”

    Trisha did some research. Studies show that one fourth to half of all teens in the US have been cyberbullied (网络欺凌). Experts say that if you are ever bullied online, you should tell a trusted adult. Tell the cyberbully to stop, and prevent him or her from contacting you again. Print and save messages to share with the police. This is good advice, agrees Trisha. But these methods all take place after the bullying has already happened. Trisha had a different idea. Why not teach cyberbullies to stop before they post these messages?

    Trisha's research won awards, including a prize in the Google Science Fair. Then, Tresah built the ReThink app (应用软件). It is programmed to recognize words or phrases that could be hurtful. When that happens, different warning messages come out. “Don't say things that you may regret later!” says one message. Others ask, “Are you sure you want to say this?” and “Are these words really yours?”

    Now Trisha is working on a version(版本) of ReThink for computers. “I am a big dreamer,” she says. “I want to stop cyberbullying before the hurt is done.”

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    With the development of the television and the Internet, many people have changed their hobbies and the way that they enjoy their free time. Because of the television and the Internet, many people spend less time reading, so the aim of this article is to give reasons why people should read just for pleasure. The reasons that I give you are quite simple: to improve your knowledge, to have more fun, to make your imagination（想象）fly, to find new ways to express your ideas, and to have a better understanding of life.

    Firstly, you can improve your knowledge when you read. There are nil kinds of good books to choose from. People who read more usually have a better idea about life than those who do not read so often.

    Secondly, you can have fun and increase your imagination by reading books Children have very good imaginations, so parents need to read lots of stories that feed their imagination. Adults should try to develop their imagination by reading books that make them think amazing things.

    Finally, no matter how old you are, it can help you to have a better understanding of life and express your ideas to others in a simple and correct form.

    So I suggest that you read more. I know that many of us like to play on the Internet when we are free, but we must also not forget to read books. Try to choose good books in the beginning, and then I'm sure that you will never stop reading.

    Dogs were living as companions to the early settlers of North America over 10,000 years ago. The oldest domestic dogs in the Americas were thought to be around 9500 years old. Angela Perri of Durham University, UK, and her colleagues have carried out fresh radiocarbon dating on the two dog skeletons that gave this date, discovered in the prehistoric Koster site in Illinois, and found they were even older: around 10,100 years old.

    A third dog from another Illinois site called Stilwell II was older still, at 10,190 years old. That makes it the oldest known domesticated dog in the Americas. The team concluded that all three dogs were domesticated as they skeletons were complete and unskinned, and so hadn't been butchered for food. They had also been carefully buried, evidence they were valued by their owners. The Stilwell II dog, which probably resembled a small English settler, was under what seemed to be the floor of a living area. It is unclear why it took so long for tame dogs to arrive in the Americas, given that they were domesticated at least 14,000 years ago in Eurasia. By this time, people were already moving into North America from Siberia; there is evidence some reached Chile 18,500 years ago. Geneticists have found signs of at least three waves of migration over the following millennia. There is no evidence that domestic dogs accompanied them. “We don't know if dogs were part of the first waves of immigration to the Americas" says Luc Janssens of Ghent University in Belgium. "It could be so, but no archaeological bones have yet been found." It is "overwhelmingly probable" that some of the early settlers did bring dogs to the Americas, but they may not have had "the time or the spiritual compulsion to bury them", says Pat Shipman of Pennsylvania State University.

    Food is extremely important to us human beings and rice is one of the main food in the world. Australian researchers have discovered a way to genetically engineer rice which would provide significant health benefits to more than half the world's population.

    A study undertaken at the University of Tasmania, published in a respected journal of the National Academy of Sciences, discovered a method to increase the resistant starch (抗性淀粉）content in rice, making it more digestible and leading to lower rate of diabetes (糖尿病）and overweight.

    Steven Smith, the lead author of the study and a foreign expert for the Chinese government who has been appointed to work on crop improvement projects by the Chinese Academy of Sciences, said increasing the higher resistant starch content gave this “designer” rice many added health benefits. “We have discovered that we can increase the amount of resistant starch in cooked rice, which could provide health benefits for a large number of people in Asia and beyond,” Smith said in a media release on Friday. “The same approach can be adapted for use in other cereals, including wheat. Not only can it have benefits for diabetes and obesity, but also for disorders of the bowel(肠）including cancer.”

    Rice is the main food for more than half the world's population, providing much of the world with most of their calories. Smith said that as the rate of diabetes and obesity in Asian countries continued to grow, his “designer” rice could provide a way to limit health problems.

    “Not only does resistant starch reduce the possibility of a 'sugar hit' but it also reduces the appetite and promotes the growth of the healthy germs.” Smith said.

Smith divides his time between the University of Tasmania and his research lab in Beijing where he hopes to make significant advance in sustainable (可持续的）living.

    Growing roses is quite a difficult task without knowing the right way. If you are attracted by the beauty of roses and need some tips for growing them, read on for some tips about taking care of rose plants.

    You have to buy a good plant, preferably around two years old.

    While most rose plants can tolerate around six hours of sunlight every day, some varieties need eight hours of sunlight exposure. The shade-loving roses need only four hours of sunlight every day.

    You will have to soak (浸泡) the roots overnight before planting. If you plant them in a container, then the watering should be done daily, whereas garden roses need water once or twice a week.

    The next point is the application of fertilizer (肥料),which is mainly needed by rose plants in containers. Most of the varieties do not need fertilizer, as they can feed on the nutrients that exist in the soil. There is no need of fertilization during November and December, and the frequency of fertilization can be reduced in summer, especially after April. It can be restarted in September and has to be increased during the growing periods.

    Cutting the stems promotes the growth of the plants and also aids flowering. It should be done regularly to remove dead or diseased leaves and stems.

    Rose plants can be successfully grown by beginners too! With some care and consideration, all your efforts would definitely be worth it once you smell the fragrance of beautiful roses.

    Why does time seem to fly by faster as we get old? You've got your aging brain to blame. This is likely due largely to the physical changes of our nerves and neurons (神经元). New research suggests 'rapid fire' abilities of the young brain allow us to process more information during youth, causing the days to seem longer earlier in life. However, as we get old, researchers say the older brain takes more time to process information.

    The new finding put forward by a Duke University researcher was published in a paper in the journal European Review this week According to Adrian Bejan, the J. A Jones Professor of Mechanical Engineering at Duke, the physical changes of our nerves and neurons play, a major role in our perception (知觉) of time as we get old. Over the years these structures become more complex and eventually begin to degrade.

    "Little babies, for example, move their eyes much more often than adults because they're processing images at a faster rate," Beian says, For older people, this means fewer images are being processed in the same amount of time, causing experiences to seem as though they're happening more quickly.