A study published in Child Development,the top－ranked educational psychology journal,provides some of the strongest evidence yet that gesturing may have a unique effect on learning.Teachers in the United States tend to use gestures less than teachers in other countries.

     "Gesturing can be a very beneficial tool that is completely free and easily employed in classrooms," said Kimberly Fenn,study co－author and assistant professor of psychology at Michigan State University."And I think it can have long－lasting effects."

    Fenn and Ryan Duffy of MSU and Susan Cook of the University of Iowa conducted an experiment with 184 second－,third－ and fourth－graders in Michigan elementary classrooms.

    Half of the students were shown videos of an instructor teaching math problems using only speech.The others were shown videos of the instructor teaching the same problems using both speech and gestures.In the speech－only videos,the instructor simply explains the problem.In the other videos,the instructor uses two hand gestures while speaking,using different hands to refer to the two sides of the equation.Students who learned from the gesture videos performed better on a test given immediately afterward than those who learned from the speech－only video.

    Another test was given 24 hours later,and the gesture students actually showed improvement in their performance while the speech－only students did not.

    While previous research has shown the benefits of gestures in a one－on－one tutoring－style environment,the new study is the first to test the role of gestures in equivalence learning in a regular classroom.

    The study also is the first to show that gestures can help students transfer learning to new contexts—such as transferring the knowledge learned in an addition－based equation to a multiplication－based equation.

    Fenn noted that U.S.students lag behind those in many other Western countries in math and have a particularly hard time mastering equivalence problems in early grades."So if we can help them grasp this foundational knowledge earlier," she said,"it will help them as they learn algebra and higher levels of mathematics."

    People often ask which is the most difficult language to learn, and it is not easy to answer because there are too many factors to take into consideration. Firstly, in a first language the differences are unimportant as people learn their mother tongue naturally, so the question of how hard a language is to learn only makes more sense when learning a second language.

    A native speaker of Spanish, for example, will find Portuguese much easier to learn than a native speaker of Chinese, for example, because Portuguese is very similar to Spanish, while Chinese is very different, so first language can affect learning a second language. The greater the differences between the second language and our first, the harder it will be for most people to learn. Many people answer that Chinese is the hardest language to learn, possibly influenced by the thought of learning the Chinese writing system, and the pronunciation of Chinese does appear to be very difficult for many foreign learners. However, for Japanese speakers, who already use Chinese characters in their own language, learning writing will be less difficult than for speakers of languages using the Roman alphabet.

    Some people seem to learn languages easily, while others find it very difficult. Teachers and the circumstances in which the language is learned also play an important role, as well as each learner's motivation for learning. If people learn a language because they need to use it professionally, they often learn it faster than people studying a language that has no direct use in their day to day life.

    Obviously , British diplomats and other embassy staff have found that the second hardest language is Japanese, which will probably come as no surprise to many, but the language that they have found to be the most problematic is Hungarian, which uses a similar alphabet to English but has 35 cases (forms of a nouns according to whether it is subject, object, genitive, etc). This does not mean that Hungarian is the hardest language to learn for everyone, but it causes British diplomatic personnel, who are generally used to learning languages, the most difficulty. However, Tabassaran, a Caucasian language has 48 cases, so it might cause more difficulty if British diplomats had to learn it.

    Different cultures and individuals from those cultures will find different languages more difficult. Therefore, it is impossible to say that there is one language that is the most difficult language in the world.

    “Plants were expected to get larger with increased carbon dioxide in atmosphere, but changes in temperature, humidity and nutrient availability seem to trumped the benefits of increased carbon dioxide,” said researchers from the National University of Singapore.

    45 percent of the species studied now reach smaller adult sizes than they did in the past. The researchers pointed out that warmer temperatures and changing habitats, caused by climate change, are possible reasons for shrinking creatures.

    “We do not yet know the mechanisms involved, or why some organism are getting smaller while others are unaffected,” the researchers said. “Until we understand more, we could be risking negative consequences that we can' t yet quantify.”

    The change was big in cold-blooded animals. Only two decades of warmer temperatures were enough to make reptiles smaller. An increase of 1 degree centigrade caused nearly a 10 percent increase in metabolism(新陈代谢). Greater use of energy resulted in tiny tortoises and little lizards. Fish are smaller now too. Though overfishing has played a part in reducing numbers, experiments show that warmer temperatures also stop fish growth. There is a recent report on warmer temperatures' negative effects on plankton, the base of the marine ecosystem.

    Warm-blooded animals weren't immune from the size change caused by climate change. Many birds are now smaller. Mammals have been miniaturized too. Soay sheep are thinner. Red deer are weaker. And polar bears are smaller, compared with historical records.

    This is not the first time this has happened in Earth' s history. 55 million years ago, a warming event similar to the current climate change caused bees, spiders and ants to shrink by 50 to 75 percent over several thousand years. That event happened over a long time than the current climate change.

    The speed of modem climate change could mean organisms may not respond or adapt quickly enough, especially those with long generation times. So, it is likely that more negative influences of climate change will be shown in future.

    Most of us will be familiar with the traditional talent show set-up: thousands of hopefuls line up outside the audition（试音）room, wait for hours to go in and perform for a group of judges. Then these potential pop stars could be lucky and get through to the next round, or they might hear the command, "Sorry, it's a no from me. But what do the judges actually bring to a talent show?

    Music talent show judges attract millions of viewers each week to their programs. As public figures, they play an important part in advertising campaigns for these programs. They often receive high salaries and can be moody. Are they really worth the expenses and difficulties that they cause? One solution might be to replace them with computers.

    Can computers really match human judges? Scientist Dr Nick Collins and his team at the University of Sussex think they can. Dr Collins has been working on a project that involves programming three computerized judges that he says would be far more consistent in their judgment of musical performances. Employing a special programming language, Dr Collins's digital judges can be trained up by "listening" to particular musical styles. After they have been listening for a while, the programming language allows these judges to spot the specific features of the music, including the voice quality, the rhythm etc. Collins says, “The judges' listening capacity is not yet as good as a human ear, but they won't be as moody as some human reality TV show judges.”

    Maybe that is the problem with this electronic musical innovation. Real human judges on talent shows interest us with their personality, decisions and catchy phrases. Will a computer program be able to do the same?

    For as long as we've known about it, humans have searched for a cure for cancer. Across the world, countless amounts of time and money have been spent on researching a way to stop this terrible disease. But now, it seems like the answer could have been inside our own bodies the whole time.

    Recently, the Food and Drug Administration (FDA) in the US, a government agency that's responsible for healthcare, approved a new form of gene therapy (疗法) that could mean the end of a certain type of cancer.

    The therapy allows scientists to "train" the immune (有免疫力的) cells of sick patients to fight leukemia (白血病)—a form of blood cancer that mostly affects young people.

    The exciting new treatment works by removing healthy immune cells from the patient, known as T-cells, which are then changed to be able to "hunt down" cancer cells.

    The cells are then put back into the patient before they begin to get rid of the patient's leukemia over time, similar to how the body fights off other illnesses.

    "This is truly an exciting new day for cancer patients," Louis J. DeGennaro, president of the Leukemia and Lymphoma Society, said in a news release.

    Up until now, a long and painful marrow transplant (骨髓移植) was the only option for many leukemia patients.

    In this procedure, healthy blood cells are taken from a donator and placed into the sick patient, who also has to go through chemotherapy (化疗) to allow their body to adjust to the new cells.

    But with a recovery rate of around 83%—according to a news release published by the FDA—it's hoped that the days of painful trips to the hospital, or even death, are over for leukemia sufferers.

    "We're entering a new frontier in medical innovation (创新) with the ability to reprogram a patient's own cells to attack a deadly cancer," FDA representative Scott Gottlieb said in the release. "New technologies such as gene and cell therapies hold the potential to transform medicine and our ability to treat and even cure many incurable illnesses."

The UK is home to 26 world-ranked universities of the top 200 globally. At the heart of each university is the library, a space for students to access resources, absorb knowledge and gather thoughts. Here are some of our must-visit libraries across the UK. 

The British Library, London

Located in London, the British Library is home to over 170 million items. The collections offer a glimpse into literary heritage over the ages, from books to maps to manuscripts. Visitors can browse treasures including Leonardo da Vinci's notebook. Students with a reading pass are known to spend hours at a time in the reading rooms.

Bodleian Old Library, Oxford

Dating back to 1488, the Bodleian Old Library has three notable reading rooms. It is celebrated for its late Gothic architecture. You may recognize the elaborately carved ceiling from scenes in Harry Potter. Students at the university automatically get access to the library.

John Rylands Library, Manchester

Opened in 1900, this library is part of the University of Manchester, one of the top five universities in the UK. This library offers limitless research potential for students. Whether you want to make use of the rich collections available, or simply explore the site, this library should be on everyone's must-see list.

The Mitchell Library, Glasgow

The Mitchell Library is one of Glasgow's most famous landmarks. On the top of the copper dome (圆屋顶) is a bronze statue of the Roman goddess, Minerva. Visitors can climb the dome for the city's most distinctive rooftop views.