Neuroscientists have explained the risky, aggressive or just plain baffling behavior of teenagers as the product of a brain that is somehow compromised. Groundbreaking research in the past 10 years, however, shows that this view is wrong. The teen brain is not defective. It is not a half-baked adult brain, either. It has been forged by evolution to function differently from that of a child or an adult.

    The most important of the teen brain's features is its ability to change in response to the environment by modifying the communication networks that connect brain regions. It allows teenagers to make enormous progress in thinking and socialization. But the change also makes them sensitive to dangerous behavior and serious mental disorders.

    The most recent studies indicate that the riskiest behaviors arise from a mismatch between the maturation of networks in the limbic system(边缘系统), which drives emotions at adolescence, and the maturation of networks in the prefrontal cortex（前额皮质）, which occurs later and promotes sound judgment and the control of impulses. Indeed, we now know that one's prefrontal cortex continues to change noticeably until his 20s. And yet adolescence seems to be starting earlier, extending the “mismatch years.”

    The plasticity of networks linking brain regions—and not the growth of those regions, as previously thought—is key to eventually behaving like an adult. Understanding that, and knowing that a widening gap between the development of emotional and judgment networks is happening in young people today, can help parents, teachers, counselors and teenagers themselves. People will better see that behavior such as risk-taking and turning away from parents and toward peers are not signs of cognitive or emotional problems. They are a natural result of brain development, a normal part of adolescents learning how to negotiate with a complex world.

    The same understanding can also help adults decide when to intervene. A 15-year-old girl's departure from her parents' tastes in clothing, music or politics may be a source of anxiety for Mom and Dad but does not indicate mental illness. A 16-year-old boy's tendency to skateboard without a helmet or to accept risky dares from friends is not unimportant but is more likely a sign of short-range thinking and peer pressure than a desire to hurt himself. Knowing more about the unique teen brain will help all of us learn how to separate unusual behavior that is age-appropriate from that which might indicate illness. Such awareness could help society reduce the rates of teen addiction, motor vehicle accidents and depression.

    Elephants are able to know the difference between a man and a woman, and can tell an adult (成年人) from a child—all from the sound of a human voice. This is according to a study in which researchers played voice recordings to wild African elephants.

    The animals showed more fear when they heard the voices of adult Masai men. Usually Masai people hunt elephants, and this suggests that animals have grown to listen for and avoid them.

    Prof. Karen McComb and Dr Graeme Shannon from the University of Sussex led the study. They explained that in former research they had used similar experiments to show that elephants could tell—from the sound of a lion—whether the animal was a female (雌性) or a more dangerous male (雄性).

    Prof. McComb wanted to find out if the animals used their very sharp sense of hearing to recognize danger from humans.

    The scientists recorded Masai men, women and children saying, in their own language, “Look, look over there, a group of elephants are coming.” They also recorded Kamba men saying this phrase.

    Masai people often come across elephants, which can result in violent (暴力的) hunting. Kamba people, however, mainly feed on agriculture, which does not generally bring them into violent touch with the animals.

    When the team played recordings of these different voices through a hidden speaker, they found that elephant family groups showed more fear in response to the voice of a Masai man, than to a Kamba man's voice. And the adult male Masai voices caused far more violent response than the voices of women or boys.

    Last month, the president of the Maldives, Mohamed Nasheed, held an underwater meeting. The purpose of the ocean floor conference is to highlight the effects of global warming on his island nation.

    The Maldives, located in the Indian Ocean, is the lowest-lying country on Earth. Melting glaciers and polar ice are causing sea levels to rise, putting the Maldives and other low-lying areas at risk of being swallowed by the sea within the next 100 years.

    What can be done? Scientists and leaders from 190 nations will try to figure that out at the United Nations climate change conference next month. The main goal of the meeting is to come up with a new climate agreement for 2012 and beyond. That is when the existing plan, the Kyoto Protocol will expire. The agreement was created in Kyoto, Japan, in 1997. Since then, it has been ratified(正式批准) by 190 nations. The countries promised to limit the amount of greenhouse gases, such as carbon dioxide, which they produced each year.

    The debate over who should cut greenhouse emissions has been going on for years. The US has been hesitant to reduce emissions unless fast-growing nations such as China and India also reduce their use of fossil fuels. In recent months, China has taken steps to be greener. But India has been unwilling to change. It argues that it is unfair for rich nations to ask poorer countries to cut down on emissions.

    While world leaders work on a plan in Copenhagen, there are many things you can do to help the planet. You can save fuel by walking or biking instead of riding in a car. You can start a recycling program in your community. You can plant trees. Trees absorb carbon dioxide from the air and give off oxygen.

    One afternoon I toured an art museum while waiting for my husband to finish a business meeting. I was looking forward to a quiet view of the wonderful works.

    A young couple viewing the paintings ahead of me chatted nonstop between themselves. I watched them a moment and decided she was doing all the talking. I admired his patience for tolerating her constant words. Disturbed by their noise, I moved on.

    I encountered them several times as I moved through the various rooms of art. Each time I heard her constant talking, I moved away quickly.

    I was standing at the counter of the museum gift store doing some shopping when the couple approached the exit. Before they left, the man reached into his pocket and pulled out a white object. He turned it into a long cane (手杖) and then tapped his way into the coatroom to get his wife's jacket.

    "He's a brave man," the clerk at the counter said, "Most of us would give up if we were blinded at such a young age. During his recovery, he made a promise that his life wouldn't change. So, as before, he and his wife come in whenever there's a new art show."

    "But what does he get out of the art?" I asked, "He can't see."

    "Can't see! You're wrong. He sees a lot. More than you or I do," the clerk said, "His wife describes each painting so he can see it in his head."

    I learned something about patience, courage and love that day. I saw the patience of a young wife describing paintings to a person without sight and the courage of a husband who would not allow blindness to change his life.

    And I saw the love shared by two people as I watched this couple walk away arm in arm.

    Assistant professor in Musical Theatre Dance Wichita State University seeks a full-time, 9-month assistant professor, beginning in August. Applicants are required to have a degree in dance area, teaching experience at a professional or college level, ability to direct and teach stage movement. The salary depends on qualifications and experience.

    For complete information visit http://finearts.wichita.edu.

    Full Professor in Theatre and Dance

    The Department of Theatre and Dance at the University of California at San Diego (http: ∥www. theatre, ucsd.edu) is seeking an experienced theatre artist in lighting design. Applicants must work for us for at least one year. Significant professional experience is required. This position is expected to teach at both graduate and undergraduate levels.

    A review of applications will start on June 1st. Application deadline： September 1st.

    Technical Director in Performing and Fine Arts

    DeSales University's Performing and Fine Arts Department seeks a highly skilled, professional technical director. The position is a 10-month staff position with the possibility of summer employment with the Pennsylvania Shakespeare Festival. Professional experience is required； MFA is preferred.

    Please email materials to john. bell desales.edu. Screening of applications begins immediately and will continue until the position is filled.

    Assistant Director-Media Resources Center

    Maryland Institute College of Art is seeking an assistant director of Media Resources Center in the Academic Affairs Division.

    Qualifications for the position include a degree in Art History or related fields with knowledge of art and design history, library experience, excellent interpersonal communication skills and familiarity with photoshop and scanning.

    A review of applications will begin immediately; job announcements will remain open until the position is filled. Applicants are required to work for us at least 11 months and can send emails to jobs mica.edu. The salary differs depending on your experience. Please include your desired salary in your application letter.

Columbia Engineering's Summer High School Academic Program for Engineers (SHAPE) is a selective pre-college program for high school students and recent graduates. SHAPE is tailored for students with a gift for STEM: science, technology, engineering, and mathematics. Each 3-week session offers college-level, project-based courses in engineering taught by celebrated professors at the university. 

SHAPE gives students a more realistic picture of what it means to be an engineer and its professional development components help students develop the skills they need to get there.

Courses

SHAPE features creative problem-solving courses and exposes students to innovative engineering techniques and knowledge presented by professors. Please note that SHAPE does not provide college credit. 

Students gain access to the famous MakerSpace and state-of-the-art research laboratories after completing the safety training and will only do so under close guidance. 

SHAPE also provides students with workshops to explore career fields, professional development, and guidance on sharpening one's college application from admissions officers. Students in the program will be visiting companies and organizations that show the classroom content in practice. 

Application

Students are selected based on the following criteria: 

⒈Strong academic record 

⒉Personal statement to demonstrate excitement and interest in STEM through engagement in challenging courses, activities, projects, etc. 

⒊Enthusiastic letter of recommendation submitted by a math or science teacher 

⒋Creative responses to two required questions and one of the three optional questions 

We encourage all students to apply by the priority deadline of June 15, 2023, so there is no application fee. After the priority deadline, a $50 application fee is required. 

SHAPE is dedicated to supporting students and their families in need of financial assistance. We offer a limited number of need-based scholarships, which cover the full cost of SHAPE. To be considered for a need-based scholarship, families will need to provide a recent pay receipt and complete a Family Income and Expense Worksheet.

Email: shape@columbia.edu for more information.