People are less willing to rely on their knowledge and say they know something when they have access (接近) to the Internet, suggesting that our connection to the web is affecting how we think.

    Professor Evan Risko, of the Department of Psychology at the University of Waterloo, led a recent study where the team asked about 100 participants (参与者) a series of general-knowledge questions, such as naming the capital of France. For half of the study, participants had access to the Internet. They had to look up the answer when they responded that they did not know the answer. In the other half of the study, participants did not have access to the Internet.

    The team found that the people who had access to the web were about 5 percent more likely to say that they did not know the answer to the question. Furthermore, in some cases, the people with access to the Internet reported feeling as though they knew less compared to the people without access.

    “With the popularity of the Internet, we are almost frequently connected to large amounts of information. And when that data is within reach, people seem less likely to rely on their own knowledge,” said Professor Risko.

    Studying the results, the researchers thought that access to the Internet might make it less acceptable to say you know something but are incorrect. It is also possible that participants were more likely to say they didn't know an answer when they had access to the web because online searching offers an opportunity to confirm their answer, and the process of finding out the answer is rewarding.

    “Our results suggest that access to the Internet affects the decisions we make about what we know and don't know,” said Risko. “We hope this research helps us understand how easy access to large amounts of information can influence our thinking and behaviour.”

    Whether in the home or the workplace, social robots are going to become a lot more common in the next few years. Social robots are about to bring technology to the everyday world in a more humanized way, said Cynthia Breazeal, chief scientist at the robot company Jibo.

    While household robots today do the normal housework, social robots will be much more like companions than mere tools. For example, these robots will be able to distinguish when someone is happy or sad. This allows them to respond more appropriately to the user.

    The Jibo robot, arranged to ship later this year, is designed to be a personalized assistant. You can talk to the robot, ask it questions, and make requests for it to perform different tasks. The robot doesn't just deliver general answers to questions; it responds based on what it learns about each individual in the household. It can do things such as reminding an elderly family member to take medicine or taking family photos.

    Social robots are not just finding their way into the home. They have potential applications in everything from education to health care and are already finding their way into some of these spaces.

    Fellow Robots is one company bringing social robots to the market. The company's "Oshbot" robot is built to assist customers in a store, which can help the customers find items and help guide them to the product's location in the store. It can also speak different languages and make recommendations for different items based on what the customer is shopping for.

    The more interaction the robot has with humans, the more it learns. But Oshbot, like other social robots, is not intended to replace workers, but to work alongside other employees. "We have technologies to train social robots to do things not for us, but with us," said Breazeal.

    What happens inside the head of a soccer player who repeatedly heads a soccer ball. That question motivated a study of the brains of experienced players.

    Researchers at the Albert Einstein College of Medicine in New York selected 34 adults, men and women. All of the volunteers had played soccer since childhood and  now competed year﹣round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year, as well as whether they had experienced any known concussions in the past.

    Then the players completed computerized tests of their memory and other learning skills and had their brains scanned. using a complex new M.R.I. technique which can find structural changes in the brain that can't be seen during most scans.

    According to the data they presented, the researchers found that the  players who had headed the ball more than about 1, 100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory, attention and the processing of visual information, compared with players who had headed the ball less.

    This pattern of white matter loss is "similar to those seen in traumatic brain injury", like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.

    The players who had headed the ball about 1, 100 times or more in the past year were also generally worse at remembering lists of words read to them, forgetting the words far more often than players who had headed the ball less.

    Few facts about modern life seem more undeniable than how busy everyone seems to be. Across the industrialized world, large numbers of survey respondents tell researchers they're overburdened with work, at the expense of time with family and friends.

    But the total time people are working, whether paid or otherwise, has not increased in Europe or North America in recent decades. What's more, the date also show that the people who say they're the busiest generally aren't.

    Part of the answer is simple economics. As economies grow, and the incomes of the better-off have risen over time, time has literally become more valuable: Any given hour is worth more, so we experience more pressure to squeeze in more work.

But it's also a result of the kind of work in which many of us are engaged. In the past, farming work was subject to weather limits, white at present people live in an "unlimited world," and there are always more incoming emails, more meetings, more things to read, and digital mobile technology means you have a few more to-do list items.

    With time pressure weighing us down, it's hardly surprising that we live with one eye on the clock. But psychological research demonstrates that this time-awareness actually leads to worse performance. So the ironic consequence of the "busy feeling" is that we could handle to-do list less well than if we weren't so rushed.

    Arguable worst of all, the feeling of rush spreads to affect our leisure time, so that even when life finally does permit an hour or two for recovery, we end up feeling that leisure time should be spent "productively," too.

    If there's a solution to the busyness epidemic(流行病), other than the universal 21-hour workweek, it may lie in clearly realizing just how reasonable our attitudes have become. Historically, the ultimate symbol of wealth, achievement and social superiority was the freedom not to work. Now, it's busyness that has become the indicator of high status. "The best-off in our society are often very busy, and have to be," says Gershunny. "You ask me, am I busy, and I tell you: "Yes, of course I'm busy because I'm an important person!"

    Too often, we measure our worth not by the results we achieve, but by how much of our time we spend. We live crazy lives, at least in part, because it makes us feel good about ourselves.

The Coolest Inventions

    An Oceans Vacuum(吸尘器)

    There's a collection of plastic trash in the middle of the Pacific Ocean. It's bigger than Texas and growing. The way to clean it up now is to catch it with nets. That is both costly and slow. Instead, the Ocean Cleanup Project proposes a 62-mile-long floating barrier that would use natural currents to trap trash. If next year's trials succeed, a full cleanup operation would aim to start in 2020. It could reduce the trash by 42 % over 10 years.

    Easy-On Shoes

    In 2012, Matthew Walzer, a high school student with a disability, sent a note to Nike. "My dream is to go to college," he wrote, "without having to worry about someone coming to tie my shoes every day." Nike assigned a design team to the challenge. This year, they came out with their solution: the FlyEase. The basketball shoe can be fastened with one hand. A pair of Nike FlyEase shoes sells for $ 130.

    An Airport for Drones (无人机)

    As Amazon, Google, and others get ready for drone delivery service, there is one big question: What kinds of home bases will their drones have? Rwanda, in Africa, may have the answer. There, workers will soon start work on three "drone ports". The goal is to make it easier to transport food, medical supplies, electronics, and other goods through the hilly countryside. Construction is set to be completed in 2020.

    If you are a teenager without a job, you probably do not have much extra money. Sometimes parents will give their children a pocket money for doing small housework, but it is often not enough once the children grow into teenagers and want to do things with their friends all of the time. How to make money is an important thing for teens to learn. If you're wondering how a teenager can make good money, some ideas might be:

    Getting a part-time job at a local restaurant or store is always a sure way to make money as a teen. But getting a job somewhere like this might be hard, considering many jobs in local stores are being taken by adults more and more often.

    Doing landscaping (绿化) is something that most adults do not like to do, and teens can usually find jobs around their neighborhood doing the landscaping of friends and family.

    Some teens are good at something such as writing or photography. These teens can make money by doing things such as writing articles for newspapers or magazines or selling their photos online.

    Teens who live in a country area can earn money by helping out on farms, or they can try raising their own animals such as chickens, and selling them or their products.

    Looking for jobs can seem hard at first, but if you have a try, it should not be too hard to find a job or way to make money.