I was born in Thailand, where I feel at home. I am used to jumping on to a song taow (red taxi), and squeezing (挤过) in between two strangers. I am used to bargaining at the market to get a shirt that I like. I love telling bilingual (双语的) jokes and I am used to the surprised looks I get from the Thais when I can speak their language fluently.

    Every two years my family goes to America for the summer, and every two years my world is turned upside down. The prices of everything are three times what they were in Thailand, but there is the sweet drink Dr. Pepper! And Bluebell Ice-cream! And everything you could imagine! I am amazed at it all, but the biggest change for me is the people. There are white people everywhere. I am not tall but average (中等的), my yellow hair is no longer out of place, and speaking English no longer draws looks. I should feel comfortable. I'm not out of place anymore, and nobody is looking at me, but I feel like they are. Now I feel out of place and different. I'm not used to giving people handshakes and hugs when I meet them for the first time. I get looks when I have trouble figuring out how much money to pay. I know different music, different places, and different fashion. I can't understand these people who have never left their town or city.

    Still, there are quite a few perks about living overseas. I get to meet people from all over the world, and I know how to adjust to (适应) different cultures and places. I have been to places most people see only in geography books. Still, being so different makes it hard to know who you are. I'm not Thai, but I am not American either. I am a mix of both cultures, a third culture kid.

    My family was gathered for a barbecue when the discussion arose about a celebrity who earned a large amount of money. The major criteria for receiving millions of dollars seem to be determined by how much the audience will pay to watch the performer achieve.

    The discussion led to a sudden self-questioning. Why did I choose teaching for a career? I half-listened to their conversation as I pondered the answer.

    I remembered my three children watching me spend nights planning for my class. I remembered how they intently listened to my frustrations concerning materials, procedures and the amount of responsibility that seemed to endlessly be thrust into the laps of classroom teachers. I remembered when it came time for each of my own children to choose a profession. How I waited to hear if any had plans to follow Mom into teaching. Long considerations held no mention of anyone becoming a teacher.

    Dessert was being served, and everyone was still involved in the discussion of the enormous salary of one individual, when the phone rang. My husband handed the phone to me.

"Hello, this is Bonnie Block," I said.

"Is this the Bonnie Block who used to teach kindergarten?"

    A nervous sensation swelled in me, and my mind raced with memories of those days long ago.

"Yes!" I exclaimed with a lump in my throat. It seemed like forever as I waited anxiously to hear what the caller would say next.

"I am Danielle—Danielle Russ. I was in your kindergarten class."

    Tears of surprise and joy rolled down my flushed cheeks.

"Yes," I uttered softly as I remembered that darling, wonderful child.

"Well, I am graduating from high school this year, and I have been trying to find you. I wanted you to know what a difference you made in my life."

She proceeded to give details. My influence on her wasn't limited to kindergarten but remained a strong motivating force when she needed a coach to help her meet a challenge. "I pictured you praising and encouraging me all the way."

    Why choose teaching?

    The pay is great!

    It's generally believed that people act the way they do because of their personalities and attitudes. They recycle their garbage because they care about the environment. They pay $5 for a caramel brulee latte because they like expensive coffee drinks.

    It's undeniable that behavior comes from our inner dispositions(性情), but in many instances we also draw inferences about who we are, as suggested by the social psychologist Daryl Bern, by observing our own behavior. We can be strangers to ourselves. If we knew our own minds, why should we need to guess what our preferences are from our behavior? If our minds were an open book, we would know exactly how much we care about the environment or like lattes. Actually, we often need to look to our behavior to figure out who we are.

    Moreover, we don't just use our behavior to learn about our particular types of character — we infer characters that weren't there before. Our behavior is often shaped by little pressures around us, which we fail to recognize. Maybe we recycle because our wives and neighbors would disapprove if we didn't. Maybe we buy lattes in order to impress the people around us. We should not mistakenly believe that we always behave as a result of some inner disposition.

    Whatever pressures there can be or inferences one can make, people become what they do, though it may not be in compliance(符合) with their true desires. Therefore, we should all bear in mind Kurt Vonnegut's advice: “We are what we pretend to be, so we must be careful about what we pretend to be.”

    Back in the 1860s, a British scientist named Henry Walter Bates noticed something interesting in the animal world: a kind of butterfly, Common Mormon, can change the pattern on its wings so that it looks like another butterfly species, the Common Rose, which is poisonous for birds to eat.

    Bates argued that animals develop this ability to protect themselves from being eaten. This theory had been widely accepted by scientists. But one question remains: how do these animals manage to do that?

    After more than 150 years, scientists are finally able to answer that question-it is all down to a gene(基因) called “doublesex", according to a study published on March 6 in the journal Nature.

    In fact, scientists have long known that genes are responsible for this useful ability. But until the new study, scientists hadn't been able to find out which genes in particular were responsible.

    Scientists at the University of Chicago compared the genetic structures of the Common Mormons that changed their wing patterns with those of ones that did not. And all the results pointed to a single gene, “doublesex”.

    This was much to the scientists' surprise. They used to expect that something as complex as this would be controlled by many different genes. For example, one gene would control the color of the upper part of the wing, one would do so for the lower part.

    However, the “doublesex” gene doesn't quite do everything by itself. Instead, it acts like a switch-it “tells” other genes to change the wing patterns. Isn't that clever?

    Scientists believe that this special ability of the “doublesex” gene on Common Mormon was developed throughout the long history of evolution. “The harmless species gains an advantage by resembling something predators(捕食者) avoid,” Sean Carroll, a scientist told Nature. “it was obvious evidence for natural selection.”

    Max Vernon Mathews has been called the father of computer music. He created electronic tools so that people could use computers as musical instruments. He had a huge influence on the development of electronic music and how it is written, recorded and played.

    In 1957, Max Mathews wrote the first computer program that enabled a computer to create sound and play it back. At the time, he was working as an engineer at Bell Laboratories in New Jersey. His computer program was called Music. It enabled a large IBM computer to play a seventeen-second piece of music that he had written.

    The computer was so slow that it would have taken an hour to play the piece of music in seventeen seconds. For that reason, Mathews moved the work to a tape player, which could be sped up to play the music at a normal speed. He later said that the sound quality of the music notes was not great, but the technical importance of the music was huge.

    The science fiction writer Arthur C. Clarke visited Bell Laboratories in the 1960s. He heard a computer “sing” the song "Daisy Bell" on devices and programs developed by Max Mathews andother engineers. Clarke noted this technology in his book “2001: A Space Odyssey,” which was later made into a movie.

    Mathews continued creating other versions of the Music program. He became interested in how computers could help musicians outside recording studios.

    Max Mathews had a long and productive career. He worked with composers like John Cage and Edgard Varese. He helped create a center for research in computer music in Paris. And he taught at the Center for Computer Research in Music and Acoustics in Stanford University in California.

    Mathews believed modern musicians were not making full use of the power of computer music. He said a violin always sounds like a violin, but with a computer, the way a violin sounds is unlimited. He said he did not want computer sounds to replace live music. But he said he hoped laptop computers would one day be considered serious instruments

    When it comes to mental illness, many people often find it tough to get the help they need. This is especially true for young students making the transition(过渡) to college life.

    “Sometimes, students don't realize how hard it is to adjust to college,” said Laura Smith, associate dean of students at the University of Texas at Dallas. “You're not the big fish in your classes anymore; you have all kinds of personal stress; you're away from home. Dealing with these things is not easy.”

    Students who are going through these problems sometimes want to reach out. But if students don't feel comfortable seeking help, many feel that it's the responsibility of their university to help them.

    “I really wish that there was more importance placed on how counseling(咨询) centers help students,” said Comnie Trinh. “Counseling services are just as important as academics and sports.”

    Trinh, 27, graduated from Texas Woman's University in 2015. During college, she hosted various workshops on how to handle mental health conditions. Trinh used her own story to connect with students who might be facing similar problems. High academic pressures, cultural differences as an Asian American and stressful social situations stood out as some of the most common causes of Trinh's anxiety.

    It was only after years of personal problems that she could admit that reaching out isn't a sign of weakness.

    ”If you feel you can't connect with other people around you, you should address the issue without shame,” Trinh said. “You'll find that there are a lot of people out there who sincerely want to help you.”