Sound travels very well through water-much better, in fact, than it does through air. So it shouldn't be surprising that many ocean animals make noise. They use sound to communicate and hunt. As biologist Brandon Southall says, “Their whole world is related to sound.”

    Dolphins whistle, organizing hunts. Lovesick whales sing so loudly they can be heard hundreds of miles away. But these days they aren't the only ones sounding off. They have more and more competition from human machines.

    Every day, thousands of huge container ships sail across the world's oceans. On top of the engine noise, the ships' propeller (螺旋桨) make a loud noise all the time. All that can make it hard for ocean animals trying to listen out for friends, or dinner. Animals swimming nearby a ship can be deafened or even killed.

    Underwater construction can also be dangerously loud. When construction machines called pile drivers were used during repairs to the San Francisco-Oakland Bay Bridge, dead fish appeared.

    Geologist (地质学家) pound on the seafloor too, trying to find oil wells and map Earth's surface. The results are useful lo science, but all that hammering probably gives ocean animal a headache.

    As people realize how important sound is to ocean animals, they are looking for ways to reduce human noise. Ships could get quieter just by slowing down. Engineers are also trying to find quieter propeller ships.

    Now some companies are using a simple invention called a bubble curtain, which makes sound waves passing through it lose energy and gel quieter. It seems to work - when bubble curtains were fixed on the San Francisco bridge project fish deaths dropped.

    We still have a lot to learn about sound in the oceans, but together we can help keep the sea a quieter place.

    By the mid-nineteenth century, the term “icebox” had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, pubs, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butler. After the Civil War (1861-1865), as ice was used to refrigerate freight cars(货车), it also came into household use. Even before 1880, half the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor（前身）of the modem refrigerator, had been invented.

    Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was undeveloped. The common belief that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation(绝缘) and circulation needed for an efficient icebox.

    But as early as 1803, an intelligent Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetown was the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting butter of his competitors to pay an extra price for his butter, still fresh and hard in neat, one-pound bricks. One advantage of his icebox, Moore explained, was that fanners would no longer have to travel to market at night in order to keep their produce cool.

    It's a good idea for families to talk about what they would do to escape（逃跑，逃离）a fire. You'll want to talk about escape plans and escape routes，so let's start here.

    An escape plan can help every member of a family get out of a burning house. The idea is to get outside quickly and safely. Smoke from a fire can make it hard to see where things are，so it's important to learn and remember the different ways out of your home.

    If you live in an apartment building，you'll want to know the best way to the stair or other emergency exits. If you're in a room with the door closed when the fire breaks out，you need to take a few extra steps：

    Check to see if there's heat or smoke coming in the cracks(裂缝) around the door.

    If you see smoke coming under the door—don't open the door!

    If you don't see smoke—touch the door. If the door is hot or very warm—don't open the door!

    If you don't see smoke—and the door is not hot—then use your fingers to lightly touch the doorknob(门把手)．If the doorknob is hot or very warm—don't open the door!

    If the doorknob feels cool，and you can't see any smoke around the door，you can open the door very carefully and slowly. When you open the door，if you feel a burst of heat，or smoke pours into the room，quickly shut the door and make sure it is really closed. If there's no smoke or heat when you open the door，go toward your escape route exit.

    Asking for help is a sign of strength rather than weakness. In American culture, the independent individual is seen as their ideal. As the University of Missouri at St. Louis states on its website under the heading Key American Values, “Americans have been trained since very early in their lives to consider themselves as separate individuals who are responsible for their own situations in life and their own destinies.” The value also makes them think they can do everything themselves, and makes them feel badly about asking for help when they need it.

    And when it comes to work situations, when they think about asking for help there, sometimes they fear that a request for help would make them look inept. While this has always been true for men, many women in the workplace have felt the need to try twice as hard as their male colleagues and do twice as much to get just as far and to prove their worth. Sometimes when we think about asking for help, our inner voices tell us, "See, if you admit you can't do this on your own, they'll see you for the imposter(骗子) you really are."

    But the fact is, even though individualism is on the rise, we can't do everything by ourselves and we shouldn't try.

    Apple founder Steve Jobs once told the Santa Clara Valley Historical Association about the power of asking for help, and how he "never found anybody who didn't want to help me when I asked them for help". He said, at the age of 12, he called Bill Hewlett, co-founder of Hewlett-Packard, on the phone after getting his number from the phone book and asking him for spare parts so he could build a frequency counter(计频器). And Hewlett agreed and offered young Jobs a summer job assembling frequency counters.

    "If you're afraid of failing, you won't get very far," Jobs said.

    When men and women take personality tests, some of the old Mars-Venus stereotypes(定式)keep reappearing. On average, women are more cooperative, kind, cautious and emotionally enthusiastic. Men tend to be more competitive, confident, rude and emotionally flat. Clear differences appear in early childhood and never disappear.

    What's not clear is the origin of these differences. Evolutionary psychologists think that these are natural features from ancient hunters and gatherers. Another school of psychologists argues that both sexes' personalities have been shaped by traditional social roles, and that personality differences will shrink as women spend less time taking care of children and more time in jobs outside the home.

    To test these hypotheses(假设), a series of research teams have repeatedly analyzed personality tests taken by men and women in more than 60 countries around the world. For evolutionary psychologists, the bad news is that the size of the gender gap in personality varies among cultures. For social-role psychologists, the bad news is that the change is going in the wrong direction. It looks as if personality differences between men and women are smaller in traditional cultures like India's or Zimbabwe's than in the Netherlands or the United States. A husband and a stay-at-home wife in a patriarchal(男权的)Botswanan clan(部族)seem to be more alike than a working couple in Denmark or France. The more Venus and Mars have equal rights and similar jobs, the more their personalities seem to separate.

    These findings are so unbelievable that some researchers have argued they must be due to cross-cultural problems with the personality tests. But according to new data from 40.000 men and women on six continents, David P. Schmitt and his colleagues conclude that the trends are real. Dr. Schmitt, a psychologist at Bradley University in Illinois and the director of the International Sexuality Description Project, suggests that as wealthy modern societies level(使平等)the barriers between women and men, some ancient internal differences are being developed.

    The biggest changes recorded by the researchers involve the personalities of men, not women.

    Men in traditional agricultural societies and poorer countries seem more cautious and anxious, less confident and less competitive than men in the most progressive and rich countries of Europe and North America.

    To explain these differences, Dr. Schmitt and his partners from Austria and Estonia point to the hardships of life in poorer countries. They note that in some other species, environmental stress tends to extremely affect the larger sex. And, they say, there are examples of stress decreasing biological sex differences in humans.

Art therapy (治疗) involves the use of creative techniques such as drawing, painting, coloring, or sculpting to help people express themselves artistically and examine the psychological and emotional undertones. With the guidance of an art therapist, clients car "decode" the nonverbal messages in these art forms, which lead to a better understanding of their feelings and behavior so they can resolve deeper issues.

Art therapy helps people explore their emotions, relieve stress. improve symptoms of anxiety and depression, and cope with a physical illness or disability. No artistic talent is necessary for art therapy to succeed, because the therapeutic process is not about the artistic value of the work, but rather about finding associations between the creative choices made and a client's inner life. The artwork can be used as a springboard for reawakening memories and telling stories that may reveal messages and beliefs from the unconscious mind

As with any form of therapy, your first session will consist of your talking to the therapist about why you want to find help and learning what the therapist has to offer Together, you will come up with a treatment plan that involves creating some form of artwork. Once you begin creating, the therapist may, at times, simply observe your process as you work, without interrupting. When you have finished a piece of artwork—and sometimes while you are still working on it-the therapist will ask you questions of how you feel about the artistic process, what is easy or difficult about creating your artwork, and what thoughts or memories you might have had while you are working. Generally, the therapist will ask about your experience and feelings before providing any observations.

Art therapy is founded on the belief that self-expression through artistic creation has therapeutic value for those who are healing or seeking deeper understanding of themselves and their personalities. Art therapists are trained to understand the roles that various art media like color can play in the therapeutic process and how these tools can help reveal one's thoughts, feelings, and psychological disposition.