Paying a higher price than usual for a ticket to see a film in 3D is the annoyance of many a cinema-goer's life.

    But there may be a benefit to doing so, as a study has found that 3D films exercise the brain and improve short-term functioning in a similar way to brain-training tests.

    The research found that people who watched a movie in 3D improved cognitive (认知) skills, compared to those who watched it in 2D.

    The research was led by neuroscientist(神经学家) Dr Patrick Fagan from Goldsmiths University in London. More than 100 people took part in the experiment, where participants watched Disney film Big Hero 6 in either standard format or RealD 3D.

    They also carried out a brain-training-style test before and after seeing a section from the film. The test covered memory, reaction times and cognitive function and the results were compared later.

    According to the research, which was carried out in partnership with science group Thrill Laboratory, participants experienced a 23 percent increase in cognitive processing, as well as an 11 percent increase in reaction times.

     Fagan said that the results showed enough of an improvement in brain function to suggest that 3D could play a part in improving brain power in the future.

    “These findings are more significant than you might think,” he said. “It is a fact that people are living longer and there is a noticeable decline in cognitive brain function in old age which can worsen future quality of life. There has never been a better time to look at ways to improve brain function. The initial results of this study show that 3D films may potentially play a role in slowing this decline.”

    A second part of the experiment involved those watching the film being fitted with headsets that scanned brain activity and this too showed heightened (加强的) activity when watching 3D. According to the results, participants were seven percent more engaged with what they were watching, adding to argument that 3D movies are more like watching real-life—something Professor Brendan Walker from Thrill Laboratory agreed with.

    “As Professor Brendan Walker's test concluded, 3D films are more attractive and heighten the senses — this, in turn, makes the brain run at quicker speeds,” Dr Fagan said.

    Most people know precious gemstones (宝石) by their appearances. An emerald flashes deep green, a ruby seems to hold a red fire inside, and a diamond shines like a star. It's more difficult to tell where the gem was mined, since a diamond from Australia or Arkansas may appear the same to one from the Democratic Republic of the Congo. However, recently, a team of scientists has found a way to identify a gemstone's origin.

    Beneath the surface of a gemstone, on the tiny level of atoms and molecules（分子）, lie clues (线索) to its origin. At this year's meeting of the Geological Society of America in Minneapolis, Catherine McManus reported on a technique that uses lasers (激光) to clarify these clues and identify a stone's homeland. McManus directs scientific research at Materialytics, in Killeen, Texas. The company is developing the technique. “With enough data, we could identify which country, which mining place, even the individual mine a gemstone comes from,” McManus told Science News.

    Some gemstones, including many diamonds, come from war-torn countries. Sales of those “blood minerals” may encourage violent civil wars where innocent people are injured or killed. In an effort to reduce the trade in blood minerals, the U.S. government passed law in July 2010 that requires companies that sell gemstones to determine the origins of their stones.

    To figure out where gemstones come from, McManus and her team focus a powerful laser on a small sample of the gemstone. The technique is called laser-induced breakdown spectroscopy. Just as heat can turn ice into water or water into steam, energy from the laser changes the state of matter of the stone. The laser changes a miniscule part of the gemstone into plasma, a gas state of matter in which tiny particles（微粒）called electrons separate from atoms.

    The plasma, which is superhot, produces a light pattern. (The science of analyzing this kind of light pattern is called spectroscopy.) Different elements produce different patterns, but McManus and her team say that gemstones from the same area produce similar patterns. Materialytics has already collected patterns from thousands of gemstones, including more than 200 from diamonds. They can compare the light pattern from an unknown gemstone to patterns they do know and look for a match. The light pattern acts like a signature, telling the researchers the origin of the gemstone.

    In a small test, the laser technique correctly identified the origins of 95 out of every 100 diamonds. For gemstones like emeralds and rubies, the technique proved successful for 98 out of every 100 stones. The scientists need to collect and analyze more samples, including those from war-torn countries, before the tool is ready for commercial use.

    Scientists like Barbara Dutrow, a mineralogist from Louisiana State University in Baton Rouge, find the technique exciting. “This is a basic new tool that could provide a better fingerprint of a material from a particular locality,” she told Science News.

    It was once common to regard Britain as a society with class distinction. Each class had unique characteristics.

    In recent years, many writers have begun to speak of the 'decline of class ' and 'classless society ' in Britain. And in modern day consumer society everyone is considered to be middle class.

    But pronouncing the death of class is too early. A recent wide-ranging study of pubic opinion found 90 percent of people still placing themselves in a particular class; 73 percent agreeed that class was still a vital part of British society.; and 52 percent thought there were still sharp class differences. Thus, class may not be culturally and politically obvious, yet it remains an imprtant part of British society. Britain seems to have a love of stratification.

    One unchanging aspect of a British person's class position is accent. The words a person speaks tell her or his class. A study of British accents during the 1970s found that a voice sounding like a BBC newsreader was viewed as the most attractive voice. Most people said this accent sounds 'educated ' and 'soft '. The accents placed at the bottom in this study, on the other hand, were regional(地区的) city accents. These accents were seen as 'common ' and 'ugly '. However, a similar study of British accents in the US turned these results upside down and placed some regional accents as the most attractive and BBC English as the least. This suggests that British attitudes towards accent have deep roots and are based on class prejudice.

    In recent years, however, young upper midder-class people in London, have begun to adopt some regional accents, in order to hide their class origins. This is an indication of class becoming unnoticed. However, the 1995 pop song ' Common People ' puts forward the view that though a middle-class person may ' want to live like common people ' they can never appreciate the reality of a working class life.

    What's your favorite type of music? Most people may prefer rock and roll, pop or jazz. These types are most publicized by television and the radio. Country music now would seem to mistakenly belong to the category of rock or pop. Publicity of this category started to drop only after the year 2000; however, it did have its peak years just before falling down.

    What people may not know is that this type of music inspired(促成) rock and roll especially with one of the most important figures in music history-Elvis Presley-who is known as the 6/King of Rock and Roll". Elvis used to be very famous at a radio program which broadcast country music back in the late 1940- s.  Country music is influenced by jazz and blues. Rock music is also influenced by jazz and blues so that they may even seem similar.

    Nowadays, country music is closely related to pop music due to artists' preference and popular demand. Starting from the 1980's it slowly divided itself into New and Old Country Music. Legends like Johnny Cash began to slip away because the new understanding of country music actually contains pop and his music just doesn't fit the category. Fortunately, country music is still heavily promoted through websites and reviews.

    Certain types of music nowadays are linked with different age groups. Classical for the people in the mid 19th century, pop in the 1920's, and then there's country music.

    All these types continue to grow and modernize while still appealing to certain age groups. More modern country music compositions tend to become different in their own ways which makes it even harder to identify them as country music while they, again, remain appealing only to certain age groups. Active promoters of country music videos, however, seem to appeal to a large number of age groups especially those active in Australia, for as long as country music isn't mixed with other types, it will eventually regain its charm as music for all ages.

    Maybe ten-year-old Elizabeth put it best when she said to her father. “But, Dad, you can't be healthy if you're dead.”

    Dad, in a hurry to get home before dark so he could go for a run, had forgotten to wear his safety belt — a mistake 11.5% of the US population make every day, according to a survey in 2015.

    The percentage doesn't seem so bad, but the big question is why still so many people ignore it when every day there are reports about car accidents and casualties (a death toll of 37461 in 2016).

    There have been many myths about safety belts ever since their first appearance in cars some forty years ago. The following are three of the most common.

    Myth Number One: It's best to be “thrown clear”of a serious accident.

    Truth: Sorry, but any accident serious enough to “throw you clear”is also going to be serious enough to give you a very bad landing. And chances are you'll have traveled through a windshield (挡风玻璃) or door to do it. Studies show that chances of dying after a car accident are twenty-five times greater in cases where people are “thrown clear.”

    Myth Number Two: Safety belts “trap” people in cars that are burning or sinking in water.

    Truth: Sorry again. but studies show that people knocked unconscious (昏迷) due to not wearing safety belts have a greater chance of dying in these accidents People wearing safety belts are usually protected to the point of having a clear head to free themselves from such dangerous situations, not to be trapped in them.

    Myth Number Three: Safety belts aren't needed at speeds of less than 30 miles an hour (mph).

    Truth: When two cars traveling at 30 mpb hit each other, an unbelted driver would meet the windshield with a force equal to diving headfirst into the ground from a height of 10 meters.

    Food festivals are a common occurrence in the UK and take place in all sorts of places and at all sorts of times. Whatever your taste, there's a food festival to match -no matter how specialized.

    Meatopia

    This three-day, London-based festival takes place at the end of August and is a meat lover's paradise. In addition to a range of meat products, from burgers to steaks, attendees can listen to live music, watch butchery shows, and attend informal meat-based workshops.

    Vegfest

    If you prefer a festival that will help you meet your five a day, then Vegfest fest is for you. This vegan-friendly event takes place several times a year. Here you can enjoy a wide selection of freshly prepared vegetables, learn cooking tips and hear talks on nutrition to help you make the most of your plant-based search.

    The Marmalade Festival

    Held in Cumbria, this festival has been running for 13 years. It includes a competition to find the best homemade marmalade. There are thousands of entries from over 30 different countries across the globe.

    The Ginger (姜) and spice Festival

    The Ginger and spice Festival, held in Market Drayton, celebrates its town's historic connection to Robert Clive, who returned from India with ginger. Because of this, they specialize in baking gingerbread, but also sell a range of spices from mild to hot.

    The National Honey show

    It started in 1921 and is the largest event of its kind. This three-day event attracts over 2000 participants to their traditional competition and offers lectures and workshops on beekeeping and, of course, that syrupy golden honey.

    While people's tastes are different from each other, the UK has something to offer most people. From large-scale festivities, to the smaller gatherings, one thing is certain: people are passionate about their food. And while some of the products on offer might be strange to someone, when food is given that much attention, it's unlikely to leave a bad taste in anyone's mouth.