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      The meaning of silence varies among cultural groups. Silences may be thoughtful, or they may be empty when a person has nothing to say. A silence in a conversation may also show stubbornness, or worry. Silence may be viewed by some cultural groups as extremely uncomfortable; therefore attempts may be made to fill every gap(间隙)with conversation. Persons in other cultural groups value silence and view it as necessary for understanding a person's needs.

        Many Native Americans value silence and feel it is a basic part of communicating among people, just as some traditional Chinese and Thai persons do. Therefore, when a person from one of these cultures is speaking and suddenly stops, what maybe implied(暗示) is that the person wants the listener to consider what has been said before continuing. In these cultures, silence is a call for reflection.

        Other cultures may use silence in other ways, particularly when dealing with conflicts among people or in relationships of people with different amounts of power. For example, Russian, French, and Spanish persons may use silence to show agreement between parties about the topic under discussion. However, Mexicans may use silence when instructions are given by a person in authority rather than be rude to that person by arguing with him or her. In still another use, persons in Asian cultures may view silence as a sign of respect, particularly to an elder or a person in authority.

Nurses and other care-givers need to be aware of the possible meanings of silence when they come across the personal anxiety their patients may be experiencing. Nurses should recognize their own personal and cultural construction of silence so that a patient's silence is not interrupted too early or allowed to go on unnecessarily. A nurse who understands the healing(治愈) value of silence can use this understanding to assist in the care of patients from their own and from other cultures.

    Science has a lot of uses. It can uncover laws of nature, cure diseases, make bombs, and help bridges to stand up. Indeed science is so good at what it does that there's always a temptation(诱惑) to drag it into problems where it may not be helpful. David Brooks, author of The Social Animal: The Hidden Sources of Love, Character, and Achievement, appears to be the latest in a long line of writers who have failed to resist the temptation.

    Brooks gained fame for several books. His latest book The Social Animal, however, is more ambitious and serious than his earlier books. It is an attempt to deal with a set of weighty topics. The book focuses on big questions: What has science revealed about human nature? What are the sources of character? And why are some people happy and successful while others aren't?

    To answer these questions, Brooks surveys a wide range of disciplines（学科）.Considering this, you might expect the book to be a dry recitation of facts. But Brooks has structured his book in an unorthodox(非常规的), and perhaps unfortunate, way. Instead of introducing scientific theories, he tells a story, within which he tries to make his points, perhaps in order to keep the reader's attention. So as Harold and Erica, the hero and heroine in his story, live through childhood, we hear about the science of child development and as they begin to date we hear about the theory of sexual attraction. Brooks carries this through to the death of one of his characters.

    On the whole, Brooks's story is acceptable if uninspired. As one would expect, his writing is mostly clear and, to be fair, some chapters stand out above the rest. I enjoyed, for instance, the chapter in which Harold discovers how to think on his own. While Harold and Erica are certainly not strong or memorable characters, the more serious problems with The Social Animal lie elsewhere. These problems partly involve Brooks's attempt to translate his tale into science.

    Patients with light or moderate depression can be successfully treated by swimming with dolphins, researchers said on Saturday.

    The study was carried out in Honduras, including patients who were thought by the doctors with light of moderate depression coming from the United States and Honduras.

    For two weeks, half of the group swam and snorkeled (潜泳) with dolphins for an hour a day. At the same time the other half group carried out the same type of water activities, but with the absence of dolphins. Researchers want to find out the influence of water and the natural setting.

    All the study volunteers didn't continue to take any drugs or psychotherapy ( 心理治疗) at least for weeks before the start of the study and did not take any drugs during the study, said the researchers from the division of clinical Psychiatry at t e the University of Leicester Medical School.

    By the end of the study, those people who swam with the dolphins had a greater average reduction in their depressive symptoms than those who did not.

    The researchers noted that the study supports the theory of biophilia, which thinks that human health and well-being depends partly on the human connection with the natural world. The findings appeared in the issue of the British Medical Journal.

    Coming from the Greek, biophilia means “love of life”, and it has been developed by biologists to reflect the humans' natural tendency to connect with nature and animals, leading to interactions and positive emotions that result in psychological treatment.

    We're surrounded by chemistry in everyday life. Sometimes it is easy to see, like when your science teacher conducts a big experiment in class. At other times, it can be extremely hard to see everyday chemistry at work, but nearly everything you touch or use has some element of chemistry in it.

    Something as simple as toothpaste contains at least three chemicals, if not more. It is the mixture of them and its chemical reaction that keeps your teeth clean. Other things you use every day are created by chemistry, such as hair products, shampoo and soap. Adding detergent (洗涤剂) to water involves chemistry. Without chemistry, we would never have realized that we need soap to get the oil out of clothes or skin.

    Chemistry not only helps us make products for use, but it also helps us understand the world around us. Chemistry helps us understand what the ozone layer (臭氧层) is and how it protects us. Chemistry also gives us sunscreen to protect us from the sun. Thanks to chemistry, we know bleach (漂白剂) can't be mixed with vinegar, because it can produce poisonous gas. Without chemistry, we wouldn't have had fireworks displays on important days like the Spring Festival.

    Chemistry plays a big role in food preparation. Cooking food causes it to go through a chemical change. That is why cooked food often tastes different from raw (生的) food. Baking is a great example of chemistry. Too much or too little of any ingredient makes a difference to the result of baking, for example, the dough (面团) won't rise or the cake will be flat.

    Chemistry isn't something that just lives in a lab; it's something that you come across hundreds of times every day. If you know how chemistry works, you will get a greater comprehension of the science behind some of the simplest looking things.

    The saying, "Don't judge a book by its cover, means you should not guess the worth or value of something based on how it looks. That message was clear at a recent event called the Human Library Project. The event took place at the Northern Virginia, or NoVa, Community College, outside of Washington. D. C.

    The Human Library began 19 years ago in Denmark. It grew from a youth organization called "Stop the Violence". Today, it is a worldwide movement. At the NoVa event, students got the chance to learn from a person—a "human book"—instead of a library book.

    Patricia Cooper organized the event. She said that human books celebrate variety by telling their life stories in an easy-going setting. "The goal of the human library is to talk to people in your community who you may otherwise not speak to because you have your own prejudices (偏见) and hopefully to break down some of these barriers."

    This is the third year that NoVa has held such an event. The collection of human books included a civil rights activist, a scientist from the American space agency NASA, and an opera singer.

    Artist Brian Dailey was a human book. He spoke about his travels to 113 countries in seven years. Dailey said that, during his travels, he asked people whom he took pictures of for a one-word answer to a series of other words—such as love, freedom and war. He discovered that people in different countries often had very different reactions to the same word.

    When Dailey asked people in Africa about the word "war" they used words like justice, liberation and peace. When he asked the same question to people in Syrian refugee camps, the answer was: "tears, hunger, fear, destruction".

A few notable moments from my most recent volunteering at the Children's Hospital never escape me.

After we had 1 with the nurses, Dr. Tiny and I went to our first room, inside which were a mother and a two-year-old boy. This young boy was 2 on the bed, jumping up and down. Mom looked at us with a sense of expectation and curiosity. She was trying to calm her son, but she couldn't. Dr. Tiny 3 his tool and waved it through the air creating bubbles (肥皂泡) in front of the child. I had a 4 with me. I started to play gentle, 5 music. As we did this, the young boy watched the bubbles with his eyes, and began to rock 6 gently to the music. He slowly reached out his hand to 7 the bubbles. We glanced over at the mom and noticed that she, too, had become 8 .

Later, we walked into another room at the Emergency Department. The patient was a teenage boy who had met with a terrible 9 , leaving him unable to sit up. 10 , he could raise his head with 11 to see us as we entered the room. He saw our guitar. "Play me a song," he said, "The Red Nose Reindeer."

I quickly adjusted my guitar, 12 my throat, and began to sing, "Jingle bells, Jingle bells, Jingle all the way…" The patient looked up with a look of 13 . With a smile, he said, "Play The Red Nose Reindeer, please!" Dr. Tiny looked at me and said, "You are starting to embarrass us." I glanced at Dr. Tiny and the patient, 14 for getting it wrong I began to sing again. As Dr. Tiny and I sang the song, the patient sang along and laughed. "That was a good one!" he shouted 15 .