Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.

    The gene comes in two versions, one of which is found in 99 percent of Europeans. The other is found in 93 to 100 percent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.

    Scientists have changed the color of a dark-striped zebra-fish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebra-fish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.

    It appears that, like the golden zebra-fish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.

    However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra-fish genes.

    Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.

    But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.

    Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.

    The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.

    Some parents can't resist the strong desire to help their children play hooky (逃学) for a trip. Five-year-old Erica and her siblings Alex, 9, and Kate, 12, missed school in Denver on Aug. 21, 2017. Their father Mr. Reed took them on a camping trip to Halsey to see the solar eclipse (日食). Kate had told her teachers she'd be absent and Mr. Reed let Erica's and Alex's teachers know, too. But he didn't ask for permission.

    Mr. Reed has loved astronomy since seeing Neil Armstrong walk on the moon on his sixth birthday. He says, “I want my own kids to have a similar kind of wonderment and hope about future discoveries.”

    Parents often dream of traveling with their children to teach them about science, geography and culture. Many teachers support them, as the Reed children's teachers did. Other teachers were angry about the extra work.

    Teacher Amanda says she feels frustrated when parents take students out of school for family trips. If she sends homework, she finds it's often returned incomplete or incorrect, because the absent student didn't hear her explanation in class. Some students suffer anxiety as they struggle to catch up. Research shows that students who are absent often, for any reason—excused or unexcused—performed more poorly in school.

    Garrick agreed to miss five days of school for the Antarctic trip last year as a senior high school student, however. Managing the homework was a challenge, but it helped him gain time management skills. “And the trip is worth the effort,” he says, “sparking his interest in international relations. You can't really put a price on changing your world view,” Garrick says. “That's what travel has done for me. It has changed how I think about things.”

    My motivation for starting our family tradition of reading in the car was purely selfish: I could not bear listening to A Sesame Street Christmas for another 10 hours. My three children had been addicted to this cassette（磁带）on our previous summer road trips.

    As I began to prepare for our next 500-mile car trip, I came across a book—Jim Trelease's—The Read Aloud Handbook. This could be the answer to my problem. I thought. So I put Roald Dahl's James and the Giant Peach into my bag. When I began to read aloud the tale of the boy who escapes the bad guys by hiding inside a giant peach, my three kids argued and fought with each other in their seats. But after several lines, they were attracted into the rhythm of the words and began to listen.

    We soon learned that the simple pleasure of listening to a well-written book makes the long miles pas more quickly. Sometimes reading became the most interesting part of the trip. I read Wilson Rawls's Summer of the Monkeys as we spent two days driving to the beach. We arrived just behind the power crews restoring（恢复）electricity after a tropical storm. The rain continued most of the week, and the beach was covered with oil washed up by the storm. When we returned home, I asked my son what he liked about the trip. He answered without hesitation “The book you read in the car.”

    Road trips still offer challenges, even though my children now are teenagers. But we continue to read as we roll across the country. And I'm beginning to see that reading aloud has done more than help pass the time. For at least a little while, we are not shut in our own electronic worlds. And maybe we've started something that will pass on to the next generation.

Scholastic Art: What is your job?

Jayson Fann: I build human-sized nests all over the world.

SA: Can people sit in your nests?

JF: Yes! People have dinner parties in my nests. They read and relax in them. Some of my nests even have several rooms. My nests are even used as hotel rooms.

SA: How do you make a nest?

JF: First, I make a design for the nest. Then I review the design with my client（客户）. After the design is final, I collect wood and work with a team to build it.

SA: What do you use to make your nests?

JF：I use eucalyptus（按树）wood， which is soft and easy to bend when it is young and freshly cut. But when it dries, it becomes extremely hard. So it holds its shape and can support weight. But the structure's strength also comes from the engineering -- how I weave the wood, and how I join major sections by bolting（用螺栓固定）them together.

SA: What makes a great nest design?

JF: Placement is important. The lines of the branches（树枝） create movement and energy, resulting in a cleaner, simpler background -- such as smooth stone or the sky -- which really fits the nest. For me, it's all about balance.

SA: What skills do you need for your job?

JF: You have to be able to draw and use different artistic tools. But you also have to know how to speak to people -- your clients and the people who work for you.

SA: What inspires you?

IF: I love to see how other artists, like Andy Goldsworthy, take common and natural materials and make something special with them.

SA: What is the best part of your job?

JF: I get to be creative in a way that doesn't harm the environment!

    I live in the center of the city and there is a largeparking lot full of parking spots nearby. Rain is a rare occurrence in LA,so cars easilycollect pollutants and dust. Together with my friends,I decided it shouldbe a kind gesture to surprise the owners with a car wash.So we bought carwashing supplies and brought out all the bath towels we could find.With all the suppliesin hand, wewere able to convince another roommate to help out as well and we beganwatering down the cars.

    Every once in a while, someone would come by and asked usseemingly stupid men, "Who told you to wash the cars?" or, even better, "who paid you to wash their cars?" Weexplained we just wanted to do something kind. But our response was often me with aneven more confused look.

    As the afternoon went on, some other friends that came byunderstood our goal of the spontaneous event and started helping out with someof the duties. Firstone friend then two, and by the time we had cleaned the entire lot,we had an entire carwashing crew with independent individually assigned tasks and duties.

    I wasn't cleaning cars to be able to afford a new phone.I was cleaning carssimply because I wanted to offer the car owners kindness.There was noequipment to weigh our value created. We couldn't measure our success indollars earned over the time spent washing cars when we could have been earningtwice as much at work.

    I now realize, first hand, that there is a special energy createdwhen you choose to think bigger than yourself and act in service of others andmaybe, likeme, you'llfind it's actually the greatest gift you' you'll ever get.

    Ever walked to the shops only to find, once there, you've completely forgotten what you went for? Or struggled to remember the name of an old friend? For years we've accepted that a forgetful brain is as much a part of aging as wrinkles and gray hair. But now a new book suggests that we've got it all wrong.

    According to The Secret Life of the Grown-up Brain, by science writer Barbara Strauch, when it comes to the important things, our brains actually get better with age. In fact, she argues that some studies have found that our brain hits its peak between our 40s and 60s — much later than previously thought.

    Furthermore, rather than losing many brain cells as we age, we keep them, and even produce new ones well into middle age. For years it's been assumed that brain, much like the body, declines with age. But the longest, largest study into what happens to people as they age suggests otherwise.

    This continuing research has followed 6,000 people since 1956, testing them every seven years. It has found that on average, participants performed better on cognitive (认知的) tests in their 40s and 50s than they had done in their 20s. Specifically, older people did better on tests of vocabulary, verbal memory (how many words you can remember) and problem solving. Where they performed less well was number ability and perceptual speed — how fast you can push a button when ordered. However, with more complex tasks such as problem-solving and language, we are at our best at middle age and beyond. In short, researchers are now coming up with scientific proof that we do get wiser with age.

    Neuroscientists are also finding that we are happier with aging. A recent US study found older people were much better at controlling and balancing their emotions. It is thought that when we're younger we need to focus more on the negative aspects of life in order to learn about the possible dangers in the world, but as we get older we've learned our lessons and are aware that we have less time left in life: therefore, it becomes more important for us to be happy.