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    After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.

    Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.

    The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (来源) for the wolf – grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park' s red foxes, and completely drove away the park' s beavers.

    As early as 1966,biologists asked the government to consider reintroducing wolves to Yellowstone Park.They hoped that wolves would be able to control the elk and coyote problems.Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.

    The government spent nearly 30 years coming up with a plan to reintroduce the wolves. The U.S.Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone. Elk,deer,and coyote populations are down,while beavers and red foxes have made a comeback.The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.

    We brush our teeth daily, but do you know everything you need to know about dental care and hygiene? Believe it or not, there is a lot more than most people realize. Luckily, here are several apps that can help you.

●Brush DJ

    You should brush your teeth for full two minutes as recommended by dentists, but that time can be difficult to judge. Many recommend you listen to music, because many songs are just around two minutes in length. Brush DJ has loads of great tunes that will get you into the two­minute habit. There are both songs to listen to, and videos to watch, and you'll find a variety of awesome tunes.

●Orasphere

    It's recommended that Orasphere videos be used by dentists for their patients, so they can learn about procedures. Those who do use these videos say that the software can greatly decrease the amount of time it takes to explain procedures to patients.

●American Dental Association(ADA)

    Everything you ever wanted to know about your teeth, and then some, can be found on the American Dental Association(ADA) website. You'll find loads of great articles that have the latest news about dentistry（牙科）. Those interested in dental careers will find plenty of information to head them in the right direction, and there's even a section devoted to public dental programs, including Give Kids a Smile and Fluoride in Water.

●DDS GP

    Here is more presentation software that explains all types of dental procedures. This is helpful for dentists to have, because they can better explain procedures to their patients.

●Dentistry IQ

    You can find information for dentists, hygienists, assistants, office managers, and more at Dentistry IQ. You can also get information about new products, clinical practices, and much more. In addition, you can learn about career opportunities, the most recent practices, and a whole lot more.

    English is full of colorful phrases to describe shyness. Someone shy might be called shrinking violet or a wallflower, while for especially nervous types we have the curious expression: they wouldn't say boo to a goose.

    None of these are traditionally seen as positive descriptions, even if you like geese. In a culture of go-getting, high achievers, shy people don't come first. Or that's what the self-help industry would have you believe. Bookshops are filled with vital tomes(巨著) that promise to help beat social fears and find success in life, love and business. That is why one book, Shrinking Violets: A Field Guide to Shyness, bucks the trend. It became a sudden success across English-language media recently for its new take-on shyness.

    Author Joe Moran says that despite struggling with shyness and longing for loneliness all his life, being shy can also be "a gift". Freed from the constant urge to participate and compete in social situations, people are liberated to look at the world in new ways, and gain fresh insights.

    Indeed, many of the world's great thinkers and artists are introverts(内向的人). Scientists Charles Darwin and Albert Einstein preferred their own company; actress Keira Knightley often finds herself tongue-tied at parties; and Harry Potter author JK Rowling claims she used to be too nervous to even borrow a pen.

    Moran told BBC Future: "I think shyness probably does turn you into an amateur anthropologist(人类学家), really-you are more likely to be an observer."

    So, while extroverts make all the noise, they don't necessarily have the best ideas.

    If you're shy, you've probably known this for a long time. You just don't shout about it.

    Singapore Flyer was launched in 2008 and states to hold the current title for the world's biggest observation wheel, full 30 meters taller than the London Eye observation wheel in London! Soaring 165 meters, Singapore Flyer offers a whole view of Singapore's important tourist attractions including the scenic Marina Bay.

      Singapore Flyer is also popular for providing an attractive range of shopping and dining choices. Among its greatest dining choices is the Singapore Flyer Sky Dining, one of the most exciting dining experiences you will ever come across.

    Singapore Flyer Sky Dining is the first ever in the world to offer a full service in the sky. To top it all you are presented with best menus created by award-winning cooks from all over the world.

    The sky dining doesn't stop from there. You will gain fast boarding flights, in other words, no more waiting in line to board an observation capsule (机舱). You can enjoy the service of an in-flight host along with a nice three-course fine dining menu.

    Be ready to enjoy yourself in the air-conditioned glass capsule where you will be served a welcome drink, an appetizer (开胃品) along with the main course. From the capsule you will see the night skyline of Marina Bay, Merlion Park, Raffles Place, Empress Place and Padang, bathed in exciting colors. And not just once but you will get to see these very interesting sights twice, during your almost one hour long special dining experience.

    Up to five couples can book a small room and there are even choices to book an entire room for you and your partner. The sky dining experience begins from the VIP waiting room where you will be served with tasty desserts and drinks of your choice. You can see the Singapore Flyer conveniently from one of the top hotels in Singapore like M Hotel Singapore.

    The world's oceans will likely lose about one-sixth of their fish and other creatures within 100 years if climate change continues on its current path. Every degree Celsius that the world's oceans warm, their biomass is expected to drop five percent, a study found.

    The study predicts that if there is no change in the rate of worldwide greenhouse gas production, there will be a 17-percent loss of biomass by the year 2100. But, if the world reduces carbon pollution, biomass losses could be limited to only about 5 percent.

    Warming temperatures are the biggest issue. But climate change also produces oceans that are more acidic and have less oxygen. This also harms sea life. Much of the world depends on the oceans for food or work.

    The findings make sense and the possible effects of the predicted losses of animal life are huge. "Climate change has the potential to cause serious new conflicts over ocean resource use as the human population continues to grow," said scientists.

    Marine biologist Boris Worm, who helped run the study, added that the "building blocks of marine life—plankton and bacteria—may decline less heavily."

    "Those marine animals that we use directly, and care about most deeply, are predicted to suffer the most," said Worm. He works at Canada's Dalehousie University.

    Scientists had already believed climate change would likely reduce future ocean life. But past computer-based studies looked at only part of the picture or used only one model. The latest study used six different computer models to give the best picture look yet, William Cheung said.

    University of Georgia marine biologist Samantha Joye was not part of the research. But she praised the study as well researched and extremely detailed, and called it "an urgent call for action".

Millions of people crowded onto trains, airplanes and buses across China last week. They were hurrying home, to be with their families for China's most important holiday, Chinese New Year. More than one billion people around the world are celebrating the New Year.

History Behind the Holiday

The Chinese New Year is celebrated at the second new moon after the winter solstice (冬至). (The winter solstice is one of the two times of the year when the sun is at its greatest distance from the equator. It is also the shortest day of the year. ) According to an ancient legend, Buddha asked all the animals to meet him on Chinese New Year. 12 animals came, and Buddha named a year after each animal. The animals were: the mouse, ox, tiger, rabbit, dragon, snake, horse, goat, monkey, rooster, dog and pig.

A Good Year to Be a Pig

Buddha announced that people born in each animal's year would have some of that animal's personality. If you were born in 1959, 1971, 1983 or 1995, you were born in the year of the Pig. People who were born in these years are believed to be polite, honest, hardworking and loyal. They are also supposed to be lucky, which is why many Chinese like to have babies in a Pig year. They are said to get along best with people born under the year of the Rabbit, Goat, Tiger, Dragon, Horse and Dog.

Festivals, Lions and Feasts

On Chinese New Year's Eve, the Chinese celebrate with fireworks, family gatherings, and feasts. One of the most popular ways to celebrate the holiday is the lion dance. The lion is considered a holy (神圣的) animal. During celebrations, dancers dressed as lions (or holding up elaborate paper lions in the air) perform to bring good luck to the people they visit at their homes or businesses. People often wear in red, which symbolizes fire. Legend has it that fire can drive away bad luck. The 15­day New Year season is celebrated with firecrackers, dragon dances and visits to friends and relatives. The celebrations end with the Lantern Festival, when brightly colored lanterns are hung in parks around China.