Dr. Michael Prager, a leading Botox expert, said that a growing number of women are developing something called “computer face”. He also mentioned that professionals who worked long hours in front of a screen were ending up with saggy jowls（颚骨下垂）,“turkey neck” and deep-set wrinkles（皱纹） on their forehead and around their eyes.

    The Botox expert said that, of all his clients, office workers were most likely to show premature （过早的）signs of aging. “ If you are one of the unfortunate people who frown（皱眉）while you are concentrating on the screen then, over time, you will inevitably（不可避免地） end up with frown lines.'' Dr. Prager said. “What is perhaps more surprising is the number of women with saggy jowls because they are sitting in one position for so long. If you spend most of the time looking down then the neck muscles shorten and go saggy, eventually giving you a second neck.”

    Dr. Prager, who has a practice near Harley Street in London, said he encourages his clients（客户） to put a mirror next to their computer so they can see if they are frowning at the screen. “When people are stressed or thinking hard about something, then they will often put on agrumpy（脾气暴躁的）face' without even knowing what they are doing. When my clients put a mirror next to their desk, they are often shocked by the angry, frowning face which stares back at them.”

    He said, “The women I am seeing at the moment have only been using computers at work for the last decade or so. But women in their 20s have grown up with them and use them for every single task. I think the problem is going to become much, much worse. In another ten years, they could be looking quite awful.”

    Dr. Prager said there were several simple steps which could avoid “computer face” such as regular screen breaks and stretching the neck muscles. And, of course, there was always Botox. He said that, after a couple of sessions of Botox, the habit of “grumpy face” could be broken.

    Dolphins (海豚) live in a dark underwater world. It's often impossible to see each other or anything else around them, so sound plays an important role in their survival. To communicate with each other, dolphins produce all kinds of sounds.

    Only other dolphins understand what the sounds mean. Scientists haven't uncovered their secret communication, except for one kind of whistle. It might last less than a second, but this whistle is a big deal. Why? Because these whistles are actually names of dolphins — and every dolphin has one. Scientists call these sounds a “signature whistle.” When other dolphins hear the whistle, they know which dolphin is calling.

    Dolphins often hunt by themselves but still need to stay connected to the group. Since they can't always see each other, dolphins use their signature whistles to check in with other dolphins hundreds of yards away. “In coastal areas, dolphins exchange whistles even when they're a third of a mile apart,” says Greg Campbell, who studies animals. That means dolphins shout out to group members that might be nearly five football fields away.

    What's amazing is who names the baby dolphin. Not the mother. Not an auntie dolphin or another group member. Scientists believe the baby dolphin itself comes up with the signature whistle. Like human babies, a baby dolphin plays with sounds throughout its first year. While testing its sound skills, a baby dolphin is doing something amazing. It's creating or figuring out its signature whistle. How or why it chooses its signature whistle is not clear. Studies show that most of the time the signature whistle is nothing like its mother's or group members' whistles.

    When the baby dolphin is about a year old, its signature whistle is set. It repeats it often so the other dolphins learn to recognize it.

    Deciphering(破译) dolphin names is just the beginning of figuring out what dolphins communicate about. Do they chat about sharks? Discuss the tides? Maybe they even have a name for people. Someday scientists are to decipher the rest of dolphins' communication.

    It has long been thought that elephants rely on their large ears and bathing in rivers to stay cool in hot climates. New research, however, has showed that the world's largest land animals have a secret trick of controlling their body temperatures.

    Scientists have long been puzzled by temperature regulation(调节)in elephants. Generally, animals with large bodies tend to hold more heat because, compared to their size, they have a small surface area for heat to escape from. Elephants, with their heavy­weight frames, would appear to be at a disadvantage in the heat of their African and Asian habitats, especially because they have thick fur to protect them from bushes and trees.

    Scientists thought that these creatures, which weigh up to 13 tons when fully­grown, grow large ears to help them stay cool. The skin on the ears is thinner, so blood which flows into them cools down more easily. But findings by researchers at two universities in Vienna have showed that elephants are also able to cool down by increasing the blood flow to skin patches(斑) in other parts of their bodies.

    The researchers studied six African elephants at Vienna Zoo as they moved between outdoor and indoor environments to see how the temperature on their skin surface would change. They found up to 15 “hot spots” all over an elephant's body surface, in addition to large patches on the ears. The study shows how these patches expand as the air temperature increases and more blood flows nearer to the skin surface. Other experiments show that elephants in the wild use the same “windows” to control their body temperature.

    Elephants have two additional ways to stay cool: flapping(拍打)the ears and bathing. Together with these tricks, the skin hot spots allow the animals to keep their body temperature always at about 36 degrees—one degree less than humans'.

    Cassie Warren and Jesse Jones will always have a great story to tell their kids about the kindness of strangers and how one stranger in particular made their wedding planning that much sweeter.

    A few weeks ago, as Warren was addressing wedding invitations for her upcoming wedding, she mistakenly used an old address for her aunt and uncle in nearby Eugene, Oregon. But when a stranger received the misaddressed mail, she didn't just throw it in the garbage like many people would have done. Instead, she returned the invitation, along with a sweet note and $20 as a wedding present.

The sender also wrote "Live long and prosper." on the comer of the card—words from "Star Trek", probably because the young couple's wedding invitation shows Jesse holding a light knife from "Star Wars" and Cassie holding a wand (魔杖) in a nod to the "Harry Potter" books.

    The generous stranger also included $20, probably as a little gift for the wedding. The young couple put the money to good use by going out to dinner with a friend who wouldn't be able to attend the wedding.

    Warren said that she was at first confused by the returned wedding invitation. "But after I saw the note, I was just surprised and blessed that she/he would do that for a stranger," Warren said. "Jesse was confused at first, too-he wondered why someone had sent us money, then I read the message to him, and he was shocked and grateful."

    Warren and Jones still don't know the name of the kind stranger, but Warren sent a thank-you note to the same address to let the sender know how much her/his generosity was appreciated. The young couple plan to marry in June and thanks to the kindness of a stranger, their marriage is already off to a sweet start.

    For decades, research has shown that children's book not only provide great pleasure to readers , but they can also play an important role in children's academic（学业上的）and social success. In 1974, researchers reported that sixth-grade children who had been read to form an early age developed into better readers and valued reading more than did sixth graders who had not been to, and they expected to continue reading throughout their lives. Others have determined that the more time children spend reading literature（文学作品）, the better their reading and writing abilities become. Significant increases have been found in young children's comprehension and vocabulary skills, their understanding of sentence structure and story structure as a result of their being read to form an early age, either at home or in school. Children who have access to literature and stories in their homes have been found to learn to read more quickly, and have better attitudes toward reading. Teachers who provide time for continuous silent reading, who share books and discuss book authors with children during the school day, positively those children's reading outside school. And the National Assessment of Educational Progress that children who frequently read for enjoyment out of school are better readers.

    Because children's literature is so valuable to children, it should also be valuable to their teacher. And so it's unfortunate that something that can play such an important role in children's lives is often moved into a less than important role teacher education.

    This article discusses three important issues about the position of children's literature in teacher﹣preparation programs. They are：⑴Respect for children's literature content in teacher education. ⑵The value of children's literature as a powerful educational tool. ⑶Children's literature as an important literary form.

    I travel a lot, and I find out different "styles"(风格）of directions every time I ask "How can I get to the post office?"

    Foreign tourists(游客) are often confused(困惑)in Japan because most streets there don't have names; in Japan, people use landmarks(地标)in their directions instead of street names. For example, the Japanese will say to travelers, "Go straight down to the corner. Turn left at the big hotel and go past a fruit market. The post office is across from the bus stop."

    In the countryside of the American Midwest, there are not usually many landmarks. There are no mountains, so the land is very flat; in many places there are no towns or buildings within miles. Instead of landmarks, people will tell you directions and distances. In Kansas or Iowa, for example, people will say, "Go north two miles. Turn east, and then go another mile."

    People in Los Angeles , California, have no idea of distance on the map; they measure(度量) distance in time, not miles. "How far away is the post office?" you ask. "Oh," they answer, "it' is about five minutes from here." You say, "Yes, but how many miles away is it ?"They don't know.

    It's true that a person doesn't know the answer to your question sometimes. What happens in such a situation? A New Yorker might say, "Sorry, I have no idea." But in Yucatan, Mexico, no one answers "I don't know." People in Yucatan believe that "I don't know" is impolite. They usually give an answer, often a wrong one. A tourist can get very, very lost in Yucatan!