Sometimes, you just can't help it. Maybe you're watching a sad movie, or thinking about the friend who moved away. Next thing you know, your eyes are watering, and you havetears running down your cheeks. Why do peoplecry when they are emotional? What are tears? Scientists are working hard to find the answers to these questions.

    Ad Vingerhoets is a professor of psychology at Tilburg University, in the Netherlands. He is one ofthe few scientists in the world who have studied crying. According to Vingerhoets, there are three types of tears. Basal tearsare the first type. Theylubricate(润滑) the eyes andact as a protective barrier between the eye and the rest of the World. Next arereflex tears. They wash youreyes clean when something gets in them. Finally, there are emotional tears. “These are released in response to emotional states, ”explains Vingerhoets. “Especially when we feel helpless.”

    Scientists believe that crying has something to do with how humans developed and learned to depend on each other.“Humans are very complex social creatures,”says Lauren Bylsma, a professor at the University of Pittsburgh, in Pennsylvania.“It seems that tears serve to arouse help and support from others," She says. “Another reason we weep is that humans have the longest developmental period of almost any animal. It takes along time to grow up. ”

    Vingerhoets agrees. “I think that the reason why humans shed tears(流眼泪) has somethingto do with our childhood,”he says. “That's the time when we are stir dependent on adults for love and protection and care. The major advantage of emotional tears is that you can target them at a specific person.”Vingerhoets says this ability to target someone could have come in hand in prehistorictimes, when humans were living among dangerous animals. Crying couldattract predators(捕食者). Tears were asafer way to get attention. In this case, it is better to use a silent signal to ask for help,”he says.

    Vingerhoets and Bylsma do frequent studies to better understand why humans cry. According to Byhma, there is still much more to discover. “It's surprising,”she says,“how much we still don't know.”

    There was good news last week for people who struggle to get eight hours of sleep a night: they may not need so much shut-eye after all.

    Researchers from UCLA and elsewhere looked at sleep habits of remote hunter-gatherers in Tanzania, Namibia and Bolivia — groups with pre-industrial lifestyles whose sleep patterns are believed to reflect those of ancient humans. The researchers found that, on average, members of each group sleep a bit less than six and a half hours a night.

    The study, published in the academic journal Current Biology, indicates that “natural” sleep is less than eight hours a night and that modern society's numerous electronic distractions (分心) aren't necessarily to blame for people getting just six or seven hours of sleep.

    “The story that often gets out is that if you sleep for less than seven hours, you're going to die early,” he told me. “That's not true.”

    Yet Americans are addicted to getting more sleep — and on turning to medical shortcuts to help them.

    According to the Centers for Disease Control, as many as 70 million U.S. adults suffer from sleep disorders or sleeplessness. Only a third of Americans get the government's recommended seven to nine hours of sleep a night.

    About 9 million American adults use sleeping pills to help get a good night's rest, the CDC found. Siegel said the number of people relying on medicines “has gone up rather rapidly since then.”

    Industry consulting firm Global Data estimates that worldwide sales for sleeplessness medicines will run about $1.4 billion next year and reach $1.8 billion by 2023, recovering from lower sales in recent years because of cheaper generics(仿制药) hitting the market.

    Dr. Roy Artal, a sleep specialist in West Los Angeles, said it's understandable that busy people in today's go-go world would turn to medicines to speed up the sleep process. But all they're doing is building a reliance on powerful drugs for relatively little improvement.

    “There's no magic pill that makes us sleep when we want and wake up when we want,” Artal said. “The effects of sleeping pills tend to be modest.”

    He and other experts say the answer to sleeplessness isn't to be found in a pill bottle. It's in what's called “sleep hygiene (保健).”

    The GRAMMY Museum is a musically fascinating journey of music in downtown Los Angeles. Turn up the beat over four floors of modern exhibits, interactive(互动的) experiences and interesting films that will give you a one-of-a-kind experience. They want to engage you, educate you, and inspire you — just like music does!

    There are over 30,000 square feet of interactive, traveling and permanent (永久的) exhibits. This includes over two dozen exhibits along that explore the greatest of the GRAMMY music! Your whole family will find something they love — rock, classical, hip hop to country…

    The Crossroads exhibition invites you to explore nearly 160 kinds of music! Open them up on the interactive table in front of you to show photos, songs and stories that describe the influence that music has on the world, as well as the music itself.

    Journey down the Songwriters Hall of Fame. How many of these songs do you know? How many songwriters have you heard of? You can also try writing a song with some songwriters in the songwriting kiosks(自助式服务设备)!

    Have you wondered how a song gets from someone's head to your radio? The third floor shows the art of recording.

    The museum always has a host of programs and events throughout the year, so make sure you keep up to date — you won't want to miss out!

HOW MUCH DOES IT COST?

Adults: $ 12.95

Children: $ 10.95 (6-17 yrs)

Free: under 5 years old

WHEN CAN WE GO?

Mon-Fri: 11:30 am – 7:30 pm

Weekends: 10:00 am – 7:30 pm

    Sometimes shut for private events, so check before you go.

    The technique can lead to new ways to produce medicines, the researchers from the universities of Istanbul and Hawaii hope.

    As part of an effort to improve treatments for life-threatening illnesses, a team of scientists have created rabbits that glow(发光) in the dark.

    Their efforts produced two rabbits out of a litter of eight that went from being a normal, fluffy white to glowing green in the dark. The rabbits were born at the University of Istanbul as part of a collaboration（合作） between scientists from universities in Turkey and Hawaii.

    The rabbits glow to show that a genetic manipulation technique can work efficiently, though the specific color is more cosmetic than scientific. "The green is not important at all – it's just a marker to show the experiment can be done successfully," said University of Hawaii associate professor Stefan Moisyadi.

    To produce the glowing effect, researchers injected jellyfish DNA into a mother rabbit's embryos. Those altered embryos（胚胎）. Those altered embryos were then inserted back into the mother. Similar experiments have resulted in glowing cockroaches and cats.

    Eventually, the researchers hope the technique can lead to new ways to produce medicines, Moisyadi said. “The final goal is to develop animals that act as barrier reactive to produce beneficial molecules in their milk that can be cheaply extracted, especially in countries that can't afford big pharma plants that make drugs, that usually cost $1bn to build, and be able to produce their own protein-based medication in animals," Moisyadi said.

    The rabbits are expected to have the same life span as their non-glowing counterparts（副本）, but Moisyadi said he understands people can object to this kind of experimentation involving live animals.

    "To the people against, I say: think about, what are the benefits and what are the injuries?" Moisyadi said. "And if the benefits outweigh the injuries, let's go with the benefits."

    Moisyadi, a native of Turkey who is now with the University of Hawaii, started developing the project in 2006, and researchers are now waiting to see if pregnant sheep produce similar results.

    Stress(压力) is a popular cause of major diseases affecting people worldwide. It is so common that people have begun to search for the best and easiest ways to reduce stress. {#blank#}1{#/blank#} 

    Exercise for a better life.

    Regular runners say that there is no better feeling than the one you get when you finish your daily run. Exercising is a good way for you to remove stress from your life. {#blank#}2{#/blank#} And it can also lift your mood. An additional benefit of exercising is that it keeps you fit and healthy!

    Organize it.

    Keeping your workplace and home organized is also a way for you to avoid stressful situations. Working in a messy(凌乱的) area keeps your brain thinking on several different things at the same time. {#blank#}3{#/blank#} 

    Manage your time wisely.

    {#blank#}4{#/blank#} Sticking to(坚持) your schedule gives you focus and a goal to work on. It also helps you avoid missing out on deadlines which are a great source of stress. Managing your time wisely means managing your stress.

    In a word, we shouldn't let stress stop us living a normal and healthy life. Stress will naturally appear due to the modern way of life. {#blank#}5{#/blank#} Don't let stress get the better of you and make you lead an unhappy life.

A. Avoid stressed people

B. Know what causes your stress.

C. Plan your day ahead and stick to it.

D. Here are some ways to say goodbye to stress.

E. Regular exercise gives you time to think things.

F. And it gets hard to focus on (思想集中) just one thing.

G. But just like fire, if we control stress it can't hurt us.

How to choose a college major?

For you to be able to choose a college major that makes sense for you, you first need to figure out what you want out of a college major. For some people, knowing they will almost always be able to find a job throughout their lives is most important. For others, being able to pursue a particular intellectual interest is the critical factor. Most people are motivated by some combination of factors that they weigh in balance. These factors will guide you towards the answer to the question," What college major is right for me?" {#blank#}1{#/blank#}

Your Interests

Your interests are an important part of picking a major. If you really dislike what you are studying, you will be miserable. {#blank#}2{#/blank#}. So it is essential that you are actually interested in what you are studying.

{#blank#}3{#/blank#}

You should also consider what you're good at when you think about how to choose your major.

This doesn't mean that you should definitely major in whatever you are best at in high school. For one thing, you will probably discover new talents in college as you take courses in areas that weren't available to you in high school. For another thing, the thing that you're "best" at is not necessarily what matches best with all your other priorities and goals.

Your Future Career

{#blank#}4{#/blank#}. For some majors, it's fairly clear what sort of job the degree will lead to. A degree in teaching will lead to teaching, a degree in nursing to nursing, and so on. For others, it's less clear.

{#blank#}5{#/blank#}. Thus, in terms of a future career, don't just think of what job title you will be qualified for, because those things shift all the time. Think about the skills you will learn in your major, and how much those skills are in demand.

To sum up, we need to take various factors into consideration when choosing a major.

A. Your Abilities

B. Your Efforts

C. Here are some factors you will probably want to consider

D. However, it's important to remember that it's finally your major

E. It makes sense to consider what kind of job prospects you will have

F. A degree in communications or sociology could lead to a variety of jobs

G. Additionally, you won't be particularly motivated to complete your coursework