America's Best National Parks

Pacific: Yosemite National Park, California

Closest city: Oakland, Calif. (3.5-hour drive)

    This Golden State treasure has thick forests and rock formations like the Half Dome—a naturalist's dream in winter, spring, summer or fall. “Anytime of year, it's such an important park,” says Patricia Schultz, author of 1000 Places to See Before you Die. She recommends taking a tour with a naturalist guide to learn about the reintroduction of wolves into the park.

Pacific: Denali National Park, Alaska

Closest city: Fairbanks, Alaska (two-hour drive)

    Denali National Park includes the towering Mt. McKinley. At 20,320 feet, it's America's tallest peak. “But the park's real glory is the wildlife viewing in a setting that is vast, terrific and pristine(原始的),” says Schultz.

West: Grand Teton National Park, Wyoming.

Closest city: Jackson, Wyo. (45-minute drive)

    Home to ski paradise Jackson Hole, the Grand Tetons offer a charming Wild West view in any season. Schultz especially likes the park for its cross-country skiing and wildlife sighting opportunities.

East: Acadia National Park, Maine

Closest city: Bangor, Maine (45-minute drive)

    A former haunt(消磨时光的去处) of an older generation of America's wealthiest, this stretch of coastline once played host to Rockefeller, Astor and Vanderbilt. Easy hiking trails(小道) lead through forests dotted with small lakes.

    “Who needs a shopping mall (购物中心)if you have Taobao?” says Wang Lin,28,a writer in Beijing.

    Taobao,China's largest online shopping site （网上购物网站）,has become an important part of Wang Lin's life. She spends lots of money on Taobao. A growing number of Chinese Internet users like Wang have found the joys of online shopping .Most online shoppers are students or young workers .More women shop on line than men. Clothing and home-use products（产品）are the most popular on line.

    It was reported that more than 250 billion（十亿）yuan was spent on online shopping last year, 80% through Taobao.

    Taobao means “looking for treasure” in Chinese. People can find almost everything they need on Taobao, from clothes to books , from candies to DVD players .

    You may question the security of online shopping ,Wang Lin said, “It's very safe and convenient ( 便利的).Unless you receive the products from the sellers and are satisfied with them, the shop owner will not get the money .You can also get your money back if you want to return the products.”

    Are you content with the shape of your nose? If not, the climate may be to blame, not your parents.

    This is according to a recent study carried out by scientists from Pennsylvania State University, US. They found that climate played a key role in shaping our noses. The findings were based on an examination of the size and shape of noses of 476 people from four regions — West Africa, East Asia, South Asia and Northern Europe, using 3D facial imaging technology.

     “People have thought for a long time the difference in nose shape among humans across the world may have arisen as a result of natural selection because of climate,” Arslan Zaidi, one of the lead authors of the study, told the Guardian. But while previous studies were based on measurements from human skulls(头骨), Zaidi and his team looked at nose shape itself.

    The result showed that wider noses are more common in warm and humid climates, while narrower noses are more common in cold and dry climates. That, Zaidi said, could be because narrower nasal passages (鼻道) help to increase the wet content of air and warm it, which is easier on our lungs. This, in turn, led to a gradual decrease in nose width in populations living far away from the equator (赤道).

    More study is still needed to test the link between climate and nose shape, but Zaidi believes the current findings are valuable in understanding potential health issue. “As we become more of a global community, we are going to come across climates that we are not adapted to,” he told the Guardian. This means moving to a very different climate might increase the risk of breathing problems.

    However, he added, “This may not be necessarily true for various reasons such as of modem medicine and the fact that our current climate is very different from what it used to be.”

Ig Nobel Prize

    Having a meal is an easy and delightful process for most people. However, for a woodpecker (啄木鸟), it's not that simple. To get dinner, a woodpecker has to hit its head against a tree numerous times per day. Yet, amazingly, it never suffers any ill effects like brain damage. According to research, it is the woodpecker's thick head bones that protect it from the impact of the blows. For explaining that, Ivan Schwab won an Ig Nobel Prize.

    Ig Nobel Prizes are organized by The Annals of Improbable Research, an American magazine that celebrates the funny side of science. Each year, ten winners are awarded prizes in honor of their “achievements that first make people laugh, and then make them think”. Most of the award-winning research, like Schwab's, may seem unusual, but it usually grabs people's attention indeed. And no matter how ridiculous the research sounds, people can find it inspiring and amusing.

    Brian Wansink's research might interest you. He took home an Ig Nobel Prize for looking into the influence of visual factors on people's appetites. He used specially designed bowls that refilled themselves with soup while people were eating. Since these people had no idea this was happening, they just kept eating from these “bottomless bowls”. They said they didn't feel full because their bowls were not empty yet. People in this experiment ate 73 percent more soup than normal. Owing to these results, Wansink concluded that it's not people's stomachs that decide when they have eaten enough, but their eyes.

    Ig Nobel Prizes also give attention to science and technology that is a part of our daily lives. Take the karaoke machine for example. Its inventor Daisuke Inoue was employed at a nightclub, playing the piano for the customers who wanted to sing. He wasn't skillful enough to play all the songs properly. To clear up the problem, he created the karaoke machine. To Inoue's surprise, the machine caused considerable changes in entertainment worldwide. The Ig Nobel Prize was awarded to Inoue not only because his invention was entertaining, but also because it brought about “an entirely new way for people to learn to tolerate each other”.

    These research results of Ig Nobel Prizes may not be as great as Edison's light bulb or Newton's laws of motion. However, they do show people's willingness to take action and to try new ways to solve problems. According to Marc Abrahams, a founder of the Ig Nobel Prizes. “If you win one, it means that you have done something.”

    Advances in artificial intelligence and the use of big data are changing the way many large companies recruit (招募) entry level and junior management positions. These days, graduates' CVs may well have to impress an algorithm (算法) rather than an (human resources) manager.

    While algorithms supposedly treat each application equally, experts are divided about whether so-called robo-recruitment promises an end to human prejudice in the selection process —or whether it may in fact add to it.

    “AI systems are not all equal,” says Loren Larsen, chief technology officer for HireVue, which has developed an automated video interview analysis system. “I think you have to look at the science team behind the work,” says Mr Larsen.

    The problem, experts say, is that to find the best candidates an algorithm has first to be told what “good” looks like in any given organization. Even if it is not given criteria that seem discriminatory, a powerful machine-learning system will quickly be able to copy the characteristics of existing workers. If an organization has favoured white male graduates from well-known universities, the algorithm will learn to select more of the same.

    The growing dependence on automation to judge suitability for everything from a loan to a job worries Yuriy Brun, an associate professor specializing in software engineering. “It takes a lot of the time for a company to put out software but it doesn't know if it is discriminatory” he says. Prof Brun explains that, considering the use of big data, algorithms will unavoidably learn to discriminate.

    Many of those working with robo-recruiters are more optimistic. Kate Glazebrook, the leader and co-founder of Applied, a hiring platform, says her task is to encourage hiring manager to move away from such indicators of quality as schools or universities and move to more evidence-based methods. When candidates complete tests online, Applied hides their names and shows the tests the candidates have completed, question by question, to human assessors. Every stage of the process has been designed to remove prejudice.

    With the same aim, Unilever decided in 2016 to switch to a more automated process for its graduate-level entry programme. Unilever worked with HireVue, Amberjack, which provides and advises on automated recruitment processes, and Pymetrics, another high volume recruitment company, which developed a game-based test in which candidates are scored on their ability to take risks and learn from mistakes, as well as on emotional intelligence. Unilever says the process has increased the ethnic diversity of its listed candidates and has been more successful at selecting candidates who will eventually be hired.

    “The things that we can do right now are impressive, but not as impressive as we're going to be able to do next year or the year after,” says Mr Larsen.

    Still, robo-recruiters must be regularly tested in case prejudice has occurred without anyone realizing it, says Frida Polli, the leader and co-founder of Pymetrics. “The majority of algorithmic tools are most likely causing prejudice to continue existing. The good ones should be examined.”

    Parallel worlds exist and interact with our world, say physicists.

    Quantum mechanics (量子力学), though firmly tested, is so weird and anti-intuitive that physicist Richard Feynman once remarked, “I think I can safely say nobody understands quantum mechanics.” Attempts to explain some of the bizarre (奇异的) consequences of quantum theory have led to some mind-bending ideas, such as the Copenhagen interpretation and the many-worlds interpretation.

    Now there's a new theory on the block, called the “many interacting worlds” hypothesis (假设) (MIW), and the idea is just as profound as it sounds. The theory suggests not only parallel worlds exist, but that they interact with our world on the quantum level and are thus detectable. Though still speculative (推测的), the theory may help to finally explain some of the bizarre consequences inherent in quantum mechanics.

    The theory is a spinoff of the many-worlds interpretation in quantum mechanics—an assumption that all possible alternative histories and futures are real, each representing an actual, though parallel, world. One problem with the many-worlds interpretation, however, has been that it is fundamentally untestable, since observations can only be made in our world. Happenings in these proposed “parallel” worlds can thus only be imagined.

    MIW, however, says otherwise. It suggests that parallel worlds can interact on the quantum level, and in fact that they do.

    “The idea of parallel universes in quantum mechanics has been around since 1957,” explained Howard Wiseman, a physicist at Griffith University in Brisbane, Australia, and one of the physicists to come up with MIW. “In the well-known 'Many-Worlds Interpretation', each universe branches into a bunch of new universes every time a quantum measurement is made. All possibilities are therefore realized — in some universes the dinosaur-killing asteroid (小行星) missed Earth. In others, Australia was colonized by the Portuguese.”

    “But critics question the reality of these other universes, since they do not influence our universe at all,” he added. “On this score, our 'Many Interacting Worlds' approach is completely different, as its name implies.”

    Wiseman and colleagues have proposed that there exists “a universal force of repulsion between 'nearby'(i.e. similar) worlds, which tends to make them more dissimilar.” Quantum effects can be explained by factoring in this force, they propose.

    When asked about whether their theory might imply that humans could someday interact with other worlds, Wiseman said: “It's not part of our theory. But the idea of human interactions with other universes is no longer pure fantasy.”

    What might your life look like if you made different choices? Maybe one day you'll be able to look into one of these alternative worlds and find out.