People who multitask all the time may be the worst at doing two things at once, a new research suggests. The findings, based on performances and self-evaluation by about 275 college students, indicate that many people multitask not out of a desire to increase productivity, but because they are easily distracted and can't focus on one activity. And “those people turn out to be the worst at handling different things,” said David Sanbonmatsu, a psychologist at the University of Utah.

    Sanbonmatsu and his colleagues gave the students a set of tests and asked them to report how often they multitasked, how good they thought they were at it, and how sensation-seeking (寻求刺激) or imperative (冲动) they were. They then evaluated the participants' multitasking ability with a tricky mental task that required the students to do simple mathematical calculations while remembering a set of letters.

    Not surprisingly, the scientists said, most people thought they were better than average at multitasking, and those who thought they were better at it were more likely to report using a cellphone while driving or viewing multiple kinds of media at once. But those who frequently deal with many things at the same time were found to perform the worst at the actual multitasking test. They also were more likely to admit to sensation-seeking and impulsive behavior, which connects with how easily people get bored and distracted.

     “People multitask not because it's going to lead to greater productivity, but because they're distractible, and they get sucked into things that are not as important.” Sanbonmatsu said.

    Adam Gazzaley, a researcher at the University of California, San Francisco, who was not a member of the research group, said one limitation of the study was that it couldn't find out whether people who start out less focused tend toward multitasking or whether people's recognizing and understanding abilities change as a result of multitasking.

    The findings do suggest, however, why the sensation-seeker who multitask the most may enjoy risky distracted driving. “People who are multitasking are generally less sensitive to risky situations.” said Paul Atchley, another researcher not in the group. “This may partly explain why people go in for these situations even though they're dangerous.”

    Stained glass (彩色玻璃) artists create different designs by making cuts on the glass to “score” it and then breaking off the pattern that they want to use in the finished product. The most difficult cut in stained glass is called an inside cut. Basically, it's a curved (弯曲的) line where you throw away the part inside of the curve. The problem with inside cuts is that the edges of the curve tend to break off when the pieces of scored glass are broken apart.

    As the artist talked about inside cuts, he said, “The glass will break into pieces if you try to cut too much off at once. The best way to do an inside cut is to slice off smaller curves piece-by-piece. In fact, it's not just the best way to do it, but it's the only way to do it.”

    How many times do you try to make a big change and cut the entire piece at once? We convince ourselves that we can do this all the time. We'll commit to transforming our diet overnight or we get inspired to launch a business in a weekend or we finally get motivated to work out and push ourselves to the edge of burning out.

    Why not approach your goals and dreams like a stained glass artist? Starting by slicing a shallow curve and breaking a small piece off, you cut a slightly deeper curve and break that off until you have your full inside cut. By slowly cutting deeper and deeper curves, you prevent the glass from breaking as it changes shape.

    Of course, change isn't easy — no matter how you do it. Slow gains are boring, but if we keep making small improvements, then pretty soon we will end up with a beautiful masterpiece on our hands instead of a bunch of broken pieces.

    Jersey Boys

    Jersey Boys is a Broadway musical that dramatizes the rise and fall of Frankie Valli and the 1960s rock 'n' roll group Four Seasons. According to Selladoor Worldwide, the group's Beijing tour will see a brand-new production of the musical, which features Luke Sheppard as director, Mark Crossland as music director and Cressida Carre as choreographer（编舞）. Since its 2005 premiere（首演）in New York, the musical has won 57 major awards worldwide.

    2:30 p.m. and 7:30 p.m., Jan 5 to Jan 13.Tianqiao Performing Arts Center, 9 Tianqiao Nandajie, Xicheng district. 400-635-3355.

    Ticket: 199-1,299 yuan ($30-200)

    Large-scale immersive show

    The large-scale immersive show Memory 5D +, directed by Ulan Xuerong, is ongoing in Beijing from Jan 4 to 7.

    The show follows the emotional entanglement between black and white spirits, representing yin and yang, and the flora girl. As a demonstration of traditional Chinese art, the show centers on cultural inheritance and includes live performance of guqin, a plucked seven-string Chinese musical instrument, guzheng, a Chinese plucked zither, konghou, an ancient plucked stringed instrument and horse-head fiddle, as well as acrobatics, Khoomei, shadow play and Mongolian folk song, even chants from The Book of Songs.

    7:30 p.m, Jan 5; 2:30 p.m./ 7:30 p. m., Jan 6; 7:30 p.m.., Jan 7. Beijing Exhibition Theater, 135 Xizhimenwai Dajie (Street), Xicheng district.

    Ticket: 180-1,080 yuan

    London Philharmonic Orchestra set to thrill Beijing

    The London Phiharmonic Orchestra will wrap up its China tour with two recitals in Being on Jan 5 and 6.

    Under the baton of Russian conductor Vasily Petrenko, the orchestra will perform H. Berlioz's overture to Beatrice et Benedict and P. I. Tchaikovsky's Fantasia on Romeo and Juliet and Variations on a Rococo Theme op.33, featuring Swedish-Danish cellist Andreas Brantelid, along with other pieces.

    7p.m., Jan 5-6. Concert Hall, National Center for the Performing Arts, 2 West Chang' an Avenue, Xicheng district. 010-6655-0000.

    Ticket: 380-1,680 yuan

    Russian army's troupe to return after restart

    The Russian army's official dance and choir troupe, the Alexandrov Ensemble, is staging five shows in Beijing from Jan 4 to 7, with a variety of songs, dances and instrumental performances.

The ensemble, also known as the Red Army Choir, was founded in 1928 and has toured the globe performing Russian folk tunes and patriotic songs using Western classical music and traditional Russian instruments.

    The repertoire on Saturday comprises 24 songs and dance pieces, including Song of the Soviet Army, The Sacred War, Moscow Nights and Festival March.

    7 p.m., Jan 5-7; 2:30 p.m., Jan 6. Opera House, National Center for the Performing Arts, 2 West Chang' an Avenue, Xicheng district. 010-6655-0000.

    Ticket: 180-1000 yuan

    Have you ever pressed the pedestrian button at a crosswalk and wondered if it really worked? They're called "placebo(安慰剂）buttons"一buttons that mechanically sound and can be pushed, but provide no functionality.

    In New York City, only about 100 of the 1, 000 crosswalk buttons actually function. Crosswalk signals were generally installed before traffic jam had reached today's levels.

    But while their function was taken over by more advanced systems—such as automated lights or traffic sensors — the physical buttons were often kept, rather than being replaced at further expense. Other cities, such as Boston, Dallas and Seattle, have gone through a similar process, leaving them with their own placebo pedestrian buttons. In London, which has 6, 000 traffic signals, pressing the pedestrian button results in a reliable "Wait" light. But that doesn't necessarily mean that the "green man"— or "pedestrian stage" in traffic signal design profession — will appear any sooner.

    "We do have some crossings where the green light comes on automatically, but we still ask people to press the button because that enables accessible features,'' said Glynn Barton, director of network management at Transport for London.

    These features, such as blind tracks and hearable traffic signals, help people with visual disorder cross the road and only function when the button is pressed. As for the lights, a growing number of them are now combined and become a part of an electronic system that detects traffic and adjusts time frequency accordingly (giving priority to buses if they're running late, for example), which means that pressing the button has no effect.

    According to Langer, a Harvard psychologist, placebo buttons give us the illusion (错觉)of control — and something to do in situations where the alternative would be doing nothing. In the case of pedestrian crossings, they may even make us safer by forcing us to pay attention to our surroundings. "They serve a psychological purpose at the very least," she added.

    Fashions have a lot of rules. Most of them, however, are just wrong. But there's one rule that goes beyond tradition and into the field of scientific study of the brain: Black garments are slimming. It all comes down to how your visual system processes the light. The below holes in each square are the same in size, yet the white hole looks bigger than the black hole.

    In the 1500s, Galileo Galilei noticed that some of the planets looked larger when viewed with the naked eye (肉眼) than they did when viewed through a telescope, making the white light of Venus (金星) appear eight to ten times larger than Jupiter (木星) in the night sky. He knew something strange must be going on with his vision to cause this illusion, but he wasn't sure what it was. Luckily, scientists never stopped wondering, and in 2014, they figured it out.

    Our visual system operates via two main channels: "on" neurons (神经元) that are sensitive to light things and "off" neurons that are sensitive to dark things. When it came to the dark "off" neurons, the researchers found that they responded predictably to dark shapes on a light background — the greater the contrast between the two, the more active these neurons were. But the light "on" neurons behaved unpredictably. Even with the same amount of contrast, light objects on a dark background caused a greater response in these neurons.

    This makes some sense, evolutionarily speaking. In the dark of night, you'd want to be able to take in every bit of light you can get, so a visual system that enlarges light objects on a dark background could be very useful. However, it's not that hard to see dark objects in the light of day. It has some effects in the colors of your clothes and in the appearance of the planets—the brighter appearance of Venus in the night sky makes it look bigger than the darker Jupiter.

    A night at the movies is always a good idea. But when you leave the theater and realize you just dropped $45 on a ticket and some snacks, you'll wish you had been patient enough to wait until the movie came out on Netflix. The average movie ticket price in the United States in 2000 was $5.39; now, a ticket is over $9.

    The main reason that movie tickets have gotten so expensive is because of inflation(通货膨胀). It was actually more expensive to go to the movies in the 70s than it is now. A ticket in 1978 cost $2.34. If you plug that into an inflation calculator, the same ticket would cost you $9.46 today. According to the National Association of Theater Owners, the average cost for a ticket today is $9.11.

    Another reason you need to dip into your life savings to see a movie on the big screen is that theaters are competing with streaming services that produce their own films, such as Netflix, Hulu, and Amazon. And let's be honest, sitting at home on your couch or in your bed is more comfortable than sitting in a cold theater.

    Because of streaming technology, movie theaters have to do something to bring in customers. Attractions­including alcohol, reclining seats(躺椅), surround sound, and 3-D movies are all examples of that. And those upgrades come at a price, leading to more expensive tickets.

    "There's all that extra cost, and it's really important for theater owners and companies to make that experience as enjoyable as possible," Patrick Corcoran, vice president of the National Association of Theatre Owners told Marketplace. "Because you're offering a superb experience­audience expectations are for the latest and greatest technology. Audiences are willing to pay more for a particular experience."