“Our aim is to take our art to the world and make people understand what it is to move,” said David Belle, the founder of parkour(跑酷).

    Do you love running? It is a good exercise, yet many people find it boring. But what if making your morning jog a creative one? Like jumping from walls and over gaps, and ground rolls? Just like the James Bond in the movie Casino Royale? Bond jumps down from a roof to a windowsill and then runs several blocks over obstacles on the way. It is just because of Bond's wonderful performances that the sport has become popular worldwide.

    Yes, that's parkour, an extreme street sport aimed at moving from one point to another as quickly as possible, getting over all the obstacles in the path using only the abilities of the human body. Parkour is considered an extreme sport. As its participants(参与者) dash around a city, they may jump over fences, run up walls and even move from roof top to roof top.

    Parkour can be just as exciting and charming as it sounds, but its participants see parkour much more than that.

    Overcoming all the obstacles on the course and in life is part of the philosophy(理念) behind parkour. This is the same as life. You must determine your destination, go straight, jump over all the barriers as if in parkour and never fall back from them in your life to reach the destination successfully. A parkour lover said, “I love parkour because its philosophy has become my life, my way to do everything.”

    Another philosophy we've learnt from parkour is freedom. It can be done by anyone, at any time, anywhere in the world. It is a kind of expression of trust in yourself. It is only a state of mind. It is when you trust yourself that you earn energy.

    situation in which they had to observe two circles on a screen.

    At first glance,price-comparison websites are an example of capitalism at its best.But it has caused fierce competition on price and eviscerated profits.Towers Watson,a consultancy,said that "unnecessary" price competition following the rise of comparison sites in Britain had cost insurers ￡1 billion a year.

    Consumers should celebrate that;the firms' losses are their gains.But there is a catch.Comparison sites introduce a new layer of costs,including their own advertising campaigns.In theory,competition in the market for comparison sites ought to keep those costs down.But David Ronayne of Warwick University argues that consumers often lose out from comparison sites.They earn a commission for each shopper who uses them for consumption such as buying insurance.That referral（委托）cost is included in the price the consumer ends up paying.If the increased costs outweigh the saving the comparison enables,consumers end up worse off.

    These worries are not just theoretical.In 2014,Britain's competition regulator found that many comparison sites were using their contracts with retailers（零售商）to ban them from offering lower prices elsewhere.That weakened rivals' incentive（对手的动机）to cut fees,because prices on their site could not fall.By keeping prices similar,the contracts also reduced the incentive for consumers to search on multiple sites,thus helping sites retain their users.

    Weaker incentives to lower commissions mean weaker incentives to lower costs,too.That might explain why comparison websites advertise so heavily,and sometimes offer free gifts to those who use them.In a recent paper,Ben Edelman of Harvard Business School and Julian Wright of the National University of Singapore argue that when a site knows that the prices merchants provide through it will always be the lowest available,it increases investment in attracting customers,safe in the knowledge that the merchants and at last consumers will bear the cost.

    Is there any way to ensure the market for price comparison is competitive?Asking consumers to check multiple websites defeats the point of using them.One solution is to have only one site,but regulate it as a public utility（功用）. Alternatively,the governments could run the site itself.But creating good search and comparison sites may be too hard for them.It is much better to acknowledge that consumers will always have to do some comparison themselves to "keep the system honest".

    Websites that compare the comparison sites can help,although it is easy to see how they could fall prey to the same problems.Any firm with captive users（被动用户）,be it a comparison site a search engine,or a social-media platform,can charge a high price for access to the eyes of its customers.For all their innovation,Internet middlemen are not unlike supermarkets.Shoppers would never imagine that a single store had the lowest price for all the items they need.

♦ Conaught Rd. West, Sheung Wan, Hong Kong Island

About the flat share

    Who lives there

    3 females, from 13 to 40 years old

    Description,

    880 sq. ft. Sea view Balcony with one bedroom &1 toilet for rent. Good for Kids to play around or dog feeding area. No short term lease and no commission(佣金). For more information, please contact Mr. Wrong on whats App.

     Room for rent Wan Chai

    About the flat share

    Who lives there

    2 adults and 2 kids

    Description

    Room for rent is available in heart of Wan Chai with families of 4 and we are looking for female students/ tourists. For more information, please kindly contact Mr. Li on what's App... thank you!

     U Lam Terrace, Midleverls Central, Hong Kong Island

    About the flat share

    Who lives there

    3 mixed gender, from 20 to 30 years old

    Description

    The flat is 5 minutes from SOHO (small office/ home office) and 2 minutes from Sheung Wan café area. The area is super quiet and convenient. There is a supermarket within 3-5 minutes' walk.

Reasonable price of 9,500 HKD per month.

     Bright Room in Share Flat near Time Square in Causeway Bay

    About the flat share

    Who lives there

    1 male, 21 years old, professional, nonsmoker

    Description

    A room in a share flat, near Time Square in Causeway Bay, available on 28 April. 5,500 HKD per month all bills inclusive, including water, electricity, WiFi Internet and cleaning service twice a week.

    In the near future, we may be using our eyes to operate our smart-phones and tablets, even when it comes to playing popular games like Fruit Ninja.

    The Gaze Group has been developing eye-controlled computer technology for nearly 20years. But those devices have been firstly designed to help those with disabilities, and are very expensive.

    “After a while, we figured out that probably the best way is to go for a mass-market way,”says Gaze's Sune Alstrup Johansen. “Where everybody would have this available.”

    Johansen and some of his colleagues have formed a new company, the Eye Tribe, which is hoping to develop the technology on a mass commercial level.

    The technology works when combined with the computing device toward the user's face. After making sure of the user's eye movements, the technology is then able to easily find where a person's eyes are moving, and then allow the eyes to control a cursor (光标)

    “Our software can then determine the location of the eyes and know where you're looking on the screen to make sure what you're looking at, ”reads an explanation on the Eye Tribe site.

    There has been a gradual change toward hands-free technology in recent years, particularly in the gaming world. Recently Xbox released the Kinect device, which lets users control their Xbox and play certain games using only their hands, legs and voices. But still, most of these devices have been more of a gimmick than a practical way to use one's hands to control a mobile device. Johansen said a replaceable filter (滤光器) would be a cheap, convenient way for most consumers.

    And even as companies like The Eye Tribe work to create such a product for the average user, making the eye-controlled technology more accessible and less expensive will have similar benefits for physically disabled users.

    For more articles on modem science, please CLICK here.

    Arriving in Sydney on his own from India, my husband, Rashid, stayed in a hotel for a short time while looking for a house for me and our children.

    During the first week of his stay, he went out one day to do some shopping. He came back in the late afternoon to discover that his suitcase was gone. He was extremely worried as the suitcase had all his important papers, including his passport.

    He reported the case to the police and then sat there，lost and lonely in strange city, thinking of the terrible troubles of getting all the paperwork organized again from a distant country while trying to settle down in a new one.

    Late in the evening, the phone rang. It was a stranger. He was trying to pronounce my husband's name and was asking him a lot of questions. Then he said they had found a pile of papers in their trash can（垃圾桶）that had been left out on the footpath.

    My husband rushed to their home to find a kind family holding all his papers and documents. Their young daughter had gone to the trash can and found a pile of unfamiliar papers. Her parents had carefully sorted them out, although they had found mainly foreign addresses on most of the documents. At last they had seen a half-written letter in the pile in which my husband had given his new telephone number to a friend.

    That family not only restored the important documents to us that day but also restored our faith and trust in people. We still remember their kindness and often send a warm wish their way.

Though new term had begun for weeks, the new girl Molly still remained 1 around her classmates. Now she was sitting at the picnic table alone. She seemed unsure of what to do or say, yet I could see her eyes longing for 2 .

Brianna, the class clown, was standing near the playground making the other students laugh, as usual. "Brianna, Molly looks awfully 3 . Would you invite her to join us?" I said.

Brianna sighed. I could tell that she was 4 to do what I was asking of her, but I also knew she was so sweet and kind. I had specifically 5 her for this task. She looked at her friends, then at Molly.

Knowing this choice was 6 her, I reached into my pocket and pulled out a D-buck, our class currency(货币). I needed to 7 her cooperation.

"Here, I'll 8 you for your time."

She offered an insincere smile, grasped the green paper, and headed off.

I watched closely as the girls talked. When they finally walked back together, I sighed with 9 .

A minute later, Brianna came back and handed me the D-buck.

"I shouldn't keep this." Her eyes fell to her feet, 10 radiating from her quiet voice. "I don't want Molly to think I only went to get her so I could earn a D-buck. She's my friend."

Then Brianna skipped back to amuse her classmates again, and who laughed for the first time that week? Molly.