For some people, music is no fun at all. About four percent of the population is what scientists call "amusic." People who are amusic are born without the ability to recognize or reproduce musical notes (音调). Amusic people often cannot tell the difference between two songs. Amusics can only hear the difference between two notes if they are very far apart on the musical scale.

As a result, songs sound like noise to an amusic. Many amusics compare the sound of music to pieces of metal hitting each other. Life can be hard for amusics. Their inability to enjoy music sets them apart from others. It can be difficult for other people to identify with their condition. In fact, most people cannot begin to grasp what it feels like to be amusic. Just going to a restaurant or a shopping mall can be uncomfortable or even painful. That is why many amusics intentionally stay away from places where there is music. However, this can result in withdrawal and social isolation. "I used to hate parties," says Margaret, a seventy-year-old woman who only recently discovered that she was amusic. By studying people like Margaret, scientists are finally learning how to identify this unusual condition.

    Scientists say that the brains of amusics are different from the brains of people who can appreciate music. The difference is complex, and it doesn't involve defective hearing. Amusics can understand other nonmusical sounds well. They also have no problems understanding ordinary speech. Scientists compare amusics to people who just can't see certain colors.

Many amusics are happy when their condition is finally diagnosed (诊断). For years, Margaret felt embarrassed about her problem with music. Now she knows that she is not alone. There is a name for her condition. That makes it easier for her to explain. "When people invite me to a concert, I just say, ‘No thanks, I'm amusic,'" says Margaret. "I just wish I had learned to say that when I was seventeen and not seventy."

    As businesses and governments have struggled to understand the so-called millennials—born between roughly 1980 and 2000—one frequent conclusion has been that they have a unique love of cities. A deep-seated preference for night life and subways, the thinking goes, has driven the revitalization of urban cores across the U.S. over the last decade-plus.

    But there's mounting evidence that millennials' love of cities was a passing fling(放纵). Millennials don't love cities any more than previous generations.

    The latest argument comes from Dowell Myers, an urban planning professor at USC. As they age, says Myers, millennials' presence in cities, will "be evaporating(蒸发) through our fingers, if we don't make some plans now." That's because millennials' preference for cities will fade as they start families and become more established in their careers.

    It's about more than aging, though. Demographer William Frey has been arguing for years that millennials have become stuck in cities by the 2008 downturn and the following slow recovery, with poor job prospects and declining wages making it harder for them to afford to buy homes in suburbia.

    Myers, too, says observers have confused young people's presence in cities with a preference for cities. Survey data shows that more millennials would like to be living in the suburbs than actually are. But the normal career and family cycles moving young people from cities into suburban houses have become, in Myers' words, "a plugged up drain."

    But unemployment has finally returned to healthy lows (though participation rates and wages are still largely stagnant), which Myers says should finally increase mobility for millennials.

    Other trends among millennials, supposedly matters of lifestyle preference, have already turned out to have been driven mostly by economics. What was once deemed their broad preference for public transit may have always been a now-reversing inability to afford cars. Even decades-long trends towards marrying later have been accentuated as today's young people struggle for financial stability.

    Investors are already taking the idea that millennials will return to old behavior patterns seriously, putting more money into auto manufacturers and developers. But urban lifestyles, up to and including trendy bars, aren't just hip—they're a part of what powers a city's economic engines, bringing people together to explore new ideas, create companies, and build careers.

    From the 1960s to the 1990s, we saw that suburbanization(城市郊区化)also means an economic and social hollowing out for cities. Now that the economic shackles are coming off today's young city residents, cities that want to stay vibrant(充满生机的) have to figure out how to convince them—and their growing families—to stick around.

    Educational APP Store

    Busuu

    Busuu helps you learn English language on the go and the lesson's quality is guaranteed as it is based on CEFR language framework. Lessons range from beginners to advanced learners. Busuu is actually a great English app if you want to improve your spoken English by talking with native speakers.

    Duolingo

    Duolingo is one of the best English language apps today and highly recommended for English beginners. The system of the app helps you learn English quickly by spending twenty minutes a day. Duolingo structures your lessons that teach you about seven new words based on a topic and skill points being awarded for completing the lessons.

    Memrise

    Memrise uses some creative and easy ways to remember English words. The focus of this app is to help the users expand their vocabulary by learning English words in an effective way. Memrise also offers an offline mode to continue learning without Internet connection.

    Rosetta Stone

    Rosetta Stone is designed differently from average language apps on the marketplace today. It's trying to teach us English the way we'd learn it if we were children starting to learn the language, it has exercises designed to help you learn basic words. A variety of lessons are offered that Rosetta Stone has been using for years.

    The skin under the eyes is delicate, which is why it sometimes appears sunken and has darker coloring than elsewhere on the face. Aging and health problems play a role in sunken eyes but other factors can contribute, so it may affect younger people as well.

Dehydration

    The most common cause of sunken eyes is dehydration, or not having enough water in the body. Consuming too much coffee, soda, and prepackaged drinks may increase production of urine(尿液), which may lead to dehydration.

    Vitamin shortages

    Shortages of vitamin C, vitamin K, and iron can cause eyes to become sunken. Vitamin C helps with absorbing iron and decreasing bruising(瘀斑), while vitamin K is responsible for blood thickening, causing unhealthy skin. Easy bruising and unhealthy skin will result in sunken eyes.

    Weight loss

    Most people tend to lose weight in their face first. Sometimes, the weight loss is sudden enough to make blood vessels(血管)below the eyes easy to see, and the skin clear, producing the appearance of sunken eyes. Sudden weight loss may also cause nutritional shortages, which can lead to sunken eyes.

    Not enough sleep or poor quality sleep can cause sunken eyes and a person's DNA or the habit of smoking can also contribute to sunken eyes. Most cases of sunken eyes relate to the quality of an individual's nutrition and healthy living. When these causes are corrected, sunken eyes can be resolved without further treatment. This means that causes can be avoided or treated in good time to prevent the recurrence of sunken eyes.

    Are you interested in country music? I like it very much! It will take me away for a while after I am tired. The guitars and songs will take me to mountains and fields. Country music usually talks of everyday life and feelings. It's the spirit of America, easy to understand, slow and simple. Country music developed in the Southern United States. It was the folk music of American countryside. Many of songs tell about the lives of farmers. They talk about love, crops or death.

    The life of the countryside can be hard, so the words in country music are often sad. At first, people played the music only at family parties. But it became more popular later. In the 1920s, people played country songs on the radio, and they made them into records. When people in the countryside moved to towns and cities to look for work, they took their music with them. Country music continued to change and became popular across America. John Denver was one of America's most famous country singers in the 1970s. His song "Take Me home, Country Roads" is well-known and people still play it today.

    As Internet users become more dependent on the Internet to store information, are people remember less？If you know your computer will save information, why store it in your own personal memory, your brain？Experts are wondering if the Internet is changing what we remember and how.

    In a recent study, Professor Betsy Sparrow conducted some experiments. She and her research team wanted to know the Internet is changing memory. In the first experiment, they gave people 40 unimportant facts to type into a computer. The first group of people understood that the computer would save the information. The second group understood that the computer would not save it. Later, the second group remembered the information better. People in the first group knew they could find the information again, so they did not try to remember it.

    In another experiment, the researchers gave people facts to remember, and told them where to find the information on the Internet. The information was in a specific computer folder(文件夹). Surprisingly, people later remember the folder location better than the facts. When people use the Internet, they do not remember the information. Rather, they remember how to find it. This is called "transactive memory (交互记忆)".

    According to Sparrow, we are not becoming people with poor memories as a result of the Internet. Instead, computer users are developing stronger transactive memories; that is, people are learning how to organize huge quantities of information so that they are able to access it at a later date. This doesn't mean we are becoming either more or less intelligent, but there is no doubt that the way we use memory is changing.