Do you know how it is when you see someone yawn and you start yawning too? Or how hard it is to be among people laughing and not laugh yourself? Well, apparently it's because we have mirror neurons (神经元）in our brains.

    Put simply, the existence of mirror neurons suggests that every time we see someone else do something, our brains imitate (模仿)it，whether or not we actually perform the same action. This explains a great deal about how we learn to smile, talk, walk, dance or play sports. But the idea goes further： mirror neurons not only appear to explain physical actions _y they also tell us that there is a biological basis for the way we understand other people.

    Mirror neurons can undoubtedly be found all over our brains, but especially in the areas which relate to our ability to use languages, and to understand how other people feel. Researchers have found that mirror neurons relate strongly to language. A group of researchers discovered that if they gave people sentences to listen to ( for example ："The hand took hold of the ball" ) , the same mirror neurons were triggered as when the action was actually performed (in this example, actually taking hold of a ball).

    Any problems with mirror neurons may well result in problems with behavior. Much researeh suggests that people with social and behavioral problems have mirror neurons which are not fully functioning. However, it is not yet known exactly how these discoveries might help find treatments for social disorders.

    Research into mirror neurons seems to provide us with ever more information concerning how humans behave and interact(互动）.Indeed, it may turn out to be the equivalent (相等物）for ncurosciencc of what Einstein's theory of relativity was for physics. And the next time you feel the urge to cough in the cinema when someone else does--well，perhaps you'll understand why.

    British Writer John Donne once said: "No man is an island; every book is a world." As an enthusiastic reader, I can't agree with the latter part of the sentence more. Every summer, I endeavor to find some peaceful places where I can attack some classics without being disturbed. Thomas Hardy wants to live far from the madding crowd. I am no friend to chaos, either.

    I read George Orwell's 1984 in a New England beachside cottage with no locks on the doors, no telephones or televisions in the rooms. 1984 is a good book that needs deep reflection. Attempting Sound and Fury lying on the bed of a poorly-occupied motel, however, was less fruitful: I made it through one and a quarter volumes, but then my eyelids were so heavy that I couldn't keep them open.

    But this summer I find myself at a loss. I'm not quite interested in J. D. Salinger, say, or Frankenstein. There's always War and Peace which I've covered some distance several times, only to get bogged down in the "War" part, set it aside for a while, and realize that I have to start over from the beginning again, having forgotten everyone's name and social rank. How appealing to simply fall back on a favorite—once more into The Call of the Wild or Alice in the Wonderland, which feels almost like cheating, too exciting and too much fun to belong to serious literature.

    And then there's John Steinbeck's The Grapes of Wrath. This title do not amaze but confuse. We're never short of sour grapes, but we've never heard of angry grapes. Anyway grapes are my favorite fruit of summer. These stone fruits can always make me feel cheerful and peaceful all at once.

    Are you afraid of sharks? What about snakes or spiders? Put those fears aside: because in the U.S. you're far more likely to be killed or injured by a deer skipping across the road.

    Deer cause more than 200 humans deaths each year, plus some 29, 000 injuries, all because of 1.2 million collisions between vehicles and deer. Most incidents occur in the eastern U.S., where deer prosper without natural predators like wolves and mountain lions.

    "That's the region in the U.S. where deer-vehicle collisions are such a problem, and where it seems like an effective large carnivore reintroduction could make a really big difference." says wildlife biologist Laura Prugh from University of Washington. She thinks it would help to reintroduce predators like mountain lions, also known as cougars, pumas or panthers, to parts of their historic range from which they've been driven out.

    The researchers say that bringing the predators back to the eastern U.S. would mean 22 percent fewer collisions between cars and deer over three decades. Each year would see five fewer human deaths, 680 fewer injuries and a savings of some 550 million. Sophie L. Gilbert thinks there are great socioeconomic benefits of large predator restoration through reduced wildlife-vehicle collisions and she says, says, "Cougars have shown that they can coexist in short distance with people, with very few conflicts, in a lot of areas out west."

    Still, some folks might be understandably nervous about this kind of plan. After all, reintroducing predators doesn't come without risks to pets and to livestock, and very occasionally to people.

    "Our fear of large predators is so natural and intense that I don't think it's possible to just completely clear it with statistics… What I hope is that knowing that there actually can be some measurable benefits might make people a little more supportive and maybe balance that fear a little bit." says Laura.

    Indeed, the statistics show that cougars would prevent five times as many human deaths from deer-related accidents as they would cause by attacks. But it'll be a tough sell: the press will cover cougar attacks, but a statistically prevented death does not make the news. Nevertheless, "If people in the west can put up with having mountain lions around, I would hope that New Yorkers would be up for the challenge as well."

Preparing Cities for Robot Cars

    The possibility of self-driving robot cars has often seemed like a futurist's dream, years away from materializing in the real world. Well, the future is apparently now. The California Department of Motor Vehicles began giving permits in April for companies to test truly self-driving cars on public roads. The state also cleared the way for companies to sell or rent out self-driving cars, and for companies to operate driverless taxi services. California, it should be noted, isn't leading the way here. Companies have been testing their vehicles in cities across the country. It's hard to predict when driverless cars will be everywhere on our roads. But however long it takes, the technology has the potential to change our transportation systems and our cities, for better or for worse, depending on how the transformation is regulated.

    While much of the debate so far has been focused on the safety of driverless cars (and rightfully so), policymakers also should be talking about how self-driving vehicles can help reduce traffic jams, cut emissions (排放) and offer more convenient, affordable mobility options. The arrival of driverless vehicles is a chance to make sure that those vehicles are environmentally friendly and more shared.

    Do we want to copy—or even worsen—the traffic of today with driverless cars? Imagine a future where most adults own individual self-driving vehicles. They tolerate long, slow journeys to and from work on packed highways because they can work, entertain themselves or sleep on the ride, which encourages urban spread. They take their driverless car to an appointment and set the empty vehicle to circle the building to avoid paying for parking. Instead of walking a few blocks to pick up a child or the dry cleaning, they send the self-driving minibus. The convenience even leads fewer people to take public transport—an unwelcome side effect researchers have already found in ride-hailing (叫车) services.

    A study from the University of California at Davis suggested that replacing petrol-powered private cars worldwide with electric, self-driving and shared systems could reduce carbon emissions from transportation 80% and cut the cost of transportation infrastructure (基础设施) and operations 40% by 2050. Fewer emissions and cheaper travel sound pretty appealing. The first commercially available driverless cars will almost certainly be fielded by ride-hailing services, considering the cost of self-driving technology as well as liability and maintenance issues (责任与维护问题). But driverless car ownership could increase as the prices drop and more people become comfortable with the technology.

    Policymakers should start thinking now about how to make sure the appearance of driverless vehicles doesn't extend the worst aspects of the car-controlled transportation system we have today. The coming technological advancement presents a chance for cities and states to develop transportation systems designed to move more people, and more affordably. The car of the future is coming. We just have to plan for it.

    Just ask any new parent: Adding a baby to a household can also add stress to a career. Now, a new study backs that up with some astonishing numbers: After science, technology, engineering, and mathematics(STEM)professionals become parents, 43%of women and 23% of men switch fields, transition(转变)to part-time work, or leave the workforce entirely.

    Many researchers and parents already knew that STEM can be unwelcoming to parents, particularly mothers. But" the considerable departure was astonishing, "says Erin Cech, an assistant professor of sociology at the University of Michigan in Ann Arbor and lead author of the study, published in the Proceedings of the National Academy of Sciences. For both genders, "the proportions were higher than we expected."

    The surprisingly high reduction rate for men also highlights that" parenthood in STEM is not just a mothers' issue; it's a worker issue, "Cech says. She hopes that the findings" might motivate changes, "such as more paid parental leave from both government and employers and policies that better support flexible work time without a tight routine. "We are not suggesting that people who want families should avoid STEM; that's not the solution," she emphasizes.

    By 2018, 78% of new fathers were still working in STEM, the vast majority full time. For new mothers, 68% were still in STEM, but only 57% worked full time. For professionals without children, on the other hand, 84% of men and 76% of women were predicted to still be working in STEM full time in 2018. For the new parents across all fields, 16% of women were working part-time and 15% had left the workforce, as compared with just 2% and 3%, respectively, for men. These sharp differences make clear that, even though the reduction rate for fathers is higher than expected, mothers still face particular career challenges.

Not long after Tony Berlin began working at the state driver's license facility in Niles in 1985, he noticed that some truck drivers who should have failed their exams mysteriously passed them. For six years, starting in 1992, he collected evidence to show why: He believed truck drivers were bribing state workers to get licenses. In another turn of the screw, the workers were using those bribes to buy tickets to the then secretary of state George Ryan's fundraisers, including for his successful bid for governor. Berlin tried to expose the corruption (腐败)-he went to the FBI and the upper ranks of the secretary of state's office - but was repeatedly met with indifference. Then he began to suspect that the truck driver in a 1994 accident that killed six children, all from the same family, got his license through the scheme. In a moment that changed everything, Berlin reached out to the Reverend Scott Willis, the children's father.

It was his call to Willis that connected the crash to what would become known as the licenses — for — bribes scandal (丑闻), "Berlin's the one who started it says the Willises' lawyer. A few months after that phone call, the U.S. attorney's office initiated Operation Safe Road, an ongoing federal investigation that by the end of November had disclosed 34 offenses.

The investigation ultimately netted 75 offenses, including that of Dean Bauer, Ryan's inspector general. He pleaded guilty in 2001 to obstructing (妨碍)justice and was sentenced to 12 months in. prison. Bui the biggest catch was Ryan himself, who was sentenced in 2006 to six and a half years tor fraud and blackmailing. As for Berlin, he continued to work a stale license facilities, in Streator and Pontiac, choosing to stay out of the public eye.