The Enigma（谜）of Beauty

    The search for beauty spans centuries and continents. Paintings of Egyptians dating back over 4,000 years show both men and women painting their nails and wearing makeup. In 18th-century France, wealthy noblemen wore large wigs (假发) of long, white hair to make themselves attractive. Today, people continue to devote a lot of time and money to their appearance.

    There is at least one good reason for the desire to be attractive: beauty is power. Studies suggest that good-looking people make more money, get called on more often in class, and are regarded as friendlier.

    But what exactly is beauty? It's difficult to describe it clearly, and yet we know it when we see it. And our awareness of it may start at a very early age. In one set of studies, six-month-old babies were shown a series of photographs. The faces on the pictures had been rated for attractiveness by a group of college students. In the studies, the babies spent more time looking at the attractive faces than the unattractive ones.

    The idea that even babies can judge appearance makes perfect sense to many researchers. In studies by psychologists, men consistently showed a preference for women with larger eyes, fuller lips, and a smaller nose and chin while women prefer men with large shoulders and a narrow waist. According to scientists, the mind unconsciously tells men and women that these traits——the full lips, clear skin, strong shoulders―equal health and genetic well-being.

    Not everyone thinks the same way, however. “Our hardwiredness can be changed by all sorts of expectations—mostly cultural,” says C. Loring Brace, an anthropologist at the University of Michigan. What is considered attractive in one culture might not be in another. Look at most Western fashion magazines: the women on the pages are thin. But is this “perfect” body type for women worldwide? Scientists' answer is no; what is considered beautiful is subjective and varies around the world. They found native peoples in southeast Peru preferred shapes regarded overweight in Western cultures.

    For better or worse, beauty plays a role in our lives. But it is extremely difficult to describe exactly what makes one person attractive to another. Although there do seem to be certain physical traits considered universally appealing, it is also true that beauty does not always keep to a single, uniform standard. Beauty really is, as the saying goes, in the eye of the beholder.

    Self-driving vehicles(车辆) will rely on cameras, sensors and artificial intelligence (人工智能) to recognize and respond to road and traffic conditions, but sensing is the most effective for objects and movement in the neighborhood of the vehicle. Not everything important in a car's environment will be caught by the vehicle's camera. Another vehicle approaching at high speed on a collision (碰撞) track might not be visible until it's too late. This is why vehicle-to-vehicle communication is undergoing rapid development. Our research shows that cars will need to be able to chat and cooperate on the road, although the technical challenges are still great.

    The usages of vehicle-to-vehicle communication contain vehicles driving together in a row, as well as safety messages about nearby emergency vehicles. Vehicles could alert each other to avoid collisions or share notices about passers-by and bicycles. From as far as several hundred metres away, vehicles could exchange messages with one another or receive information from roadside units（RSUs）about nearby incidents or dangerous road conditions through 4G network. A high level of AI seems required for such vehicles, not only to self-drive from A to B, but also to react intelligently to messages received. Vehicles will need to plan, reason, strategize and adapt according to information received in real time and to carry out cooperative behaviors. For example, a group of autonomous vehicles might avoid a route together because of possible risks, or a vehicle could decide to drop someone off earlier due to messages received, a foreseen crowding ahead.

    Further applications(应用) of vehicle-to-vehicle communication are still being researched, including how to perform cooperative behavior.

    The Island Rule is one of the best explanations scientists could give to the observable phenomenon that animals and humans have evolved (演变) depending on the resources available in their habitat (栖息地). Through time, scientists have noticed through fossil (化石) records that some large animals from mainland habitats have dwarf (矮小的) versions in bland habitats.

    A report from BBC described the existence of what scientists call “hobbit island” off a small island somewhere in Indonesia. It was given such a name because fossil records of tiny, humanlike creatures have been found in the region. What they called as “hobbits” or “Homo Floresiensis”, are only as tall as one meter and arc small versions of early human species with tinier brains.

    Though scientists cannot perfectly trace the origin of the “Homo Floriensis”, they believe that they arc human relatives, but it is the “island life” that has caused them to evolve as they have. Scientists have noticed through fossil records and existing organisms (有机体) today that it seems if large animals grow small in islands while small animals grow large in larger islands.

In theory, animal and human bodies have adjusted to the available food and fresh water in their habitats. Since there is no opportunity for them to leave their island, they might as well adapt.

    New York Magazine explained that islands usually have fewer predators (捕食者) than mainland ecosystems. However, it is the lack of resources that cause the death of many animals. As a means of natural adaptation, the bodies of these animals have evolved smaller than their ancestors, making their bodies require fewer resources.

    A report from Web Ecoist listed down a few examples of animals that have shrunk significantly compared with their ancestors. Some of these include the Bali tiger as small as leopards (豹).

    Valerie Jarrett, 58, is serving as a top adviser to President Obama and has been close to the first family since the early 1990s. Joe Heim from WashingtonPost had an interview with her.

    Joe Heim: What do you think of a reporter who interviews you for 25 minutes, then later finds out his recorder stopped working and asks you to do the interview again?

    Valerie Jarrett: That he's human. Everybody could make mistakes.

    Joe Heim: You're considered the president's closest adviser. What do you think the role of an adviser is?

    Valerie Jarrett: I think so as that the president's management style is very effective (有效的), all of his advisers should speak openly about their advice.

    Joe Heim: What misunderstandings are there of you?

    Valerie Jarrett: A little-known fact is that I started my life very shy and remained very shy well into adulthood. Painfully shy, I would call it. And I often share this, particularly with young people, because it's something I really had to work hard to overcome. And for all the shy people out there I say, you, too, can overcome it. But it took a lot of hard work on my part, and I discovered along the way that just because you're nervous and you have butterflies in your stomach doesn't mean that it has to show. My point in sharing it with you is that part of life is pushing yourself outside of your comfort zone (舒适区). And if you're going to grow, you have to learn how to take on new challenges that you might not be good at.

    Joe Heim: Will you stay until the end of his term?

    Valerie Jarrett: I serve at the pleasure of the president. If he wants me to stay, I will.

    What's the meaning of "dark horse"? It's someone who wins when no one expects it.Han Xiaopeng took China's first gold on snow. He became an Olympic "dark horse" by winning the gold medal in men's freestyle aerial skiing(自由式滑雪空中技巧) at Turin in Italy. He made two almost perfect jumps for the highest score. Han had never won a world gold medal before, let alone(更不用说) in the Olympics!

    "I never thought this would happen," said the 23-year-old. "I feel like I'm in a dream." It's China's second gold medal at the Turin Olympics. But more important, Han's gold was the country's first ever in a snow sport. In 2002, China's Yang Yang won the gold for speed skating at the winter Olympics in Salt Lake City, US.

    That Han's win was unexpected doesn't mean that he didn't work hard.

    Han grew up in Jiangsu Province. Before he started his training on snow, he used to be an acrobat(杂技演员) at a circus. In 1995, a coach found his talent(才能). The coach, Yang Er'qi, said Han had the agility(灵活性) and courage to be a ski jumper. When Yang first took the 12-year-old to northern China, the boy couldn't swim, skate or ski. But he wasn't afraid of the high platform(跳台) and kept on training.

    Han almost left the sport after hurting his knee months before the Salt Lake Games. In that Olympics he only got 24th. "I was hopeless at that time, but my family and the coach stood firmly(坚强地) behind me, helping me through," he recalled.

    Han Xiaopeng worked so hard that he won the gold medal in the Olympics at last. Because of his success, more and more people in China are becoming interested in skiing. We are proud of him and we hope he will have another big success in the next winter Olympics.

    The bus was full of the sounds of laughing and yelling fifth graders. They were on their way to the zoo for a class trip. Mario was excited to see the zoo, but there was one problem. It was ten o'clock in the morning, but his stomach was already grumbling(咕咕叫). He reached down and grabbed his lunch bag. Opening it, he saw that it contained a peanut butter and jelly sandwich, an orange, and two cookies. Mario sighed. He always had peanut butter and jell.

    “Trade you lunches,” he said to the boy seated next to him on the bus．

    “Okay,” said Mark as he handed his brown bag to Mario．

    Mario opened it and was hit with the smell of tuna(金枪鱼). Mario wrinkled his nose and quickly closed the bag. He leaned forward and tapped the shoulder of the girl in front of him.” Swap lunches, Toni?” he asked．

    “Hmm, okay,” said Toni．

    Mario smiled. This was fun. But when he looked into the bag, he frowned. What a disappointment! A ham sandwich, but no cookies! He had to have cookies．

    Mario turned in his seat. “Want to trade lunches?” he asked Juana．

    “Definitely!” said Juana. She grabbed his lunch and tossed hers onto his lap．

    He opened the lunch bag. Pizza! He reached into the bag to grab it. Oh, no! The pizza was hard. He could hit a home run with pizza that hard.

    Mario twisted in his seat. One last try, he told himself. “Hey, Mona! Trade lunches?”

    Three rows behind him, Mona seemed hesitant: Finally, she nodded. She passed her lunch forward, and he passed his back．

    Mario took a deep breath and opened the bag. It was a peanut butter and jelly sandwich, an orange, and two cookies. The sandwich was a little squashed(挤压), and one of the cookies was broken.

    Mario ate it anyway. And it was delicious.