While dog keepers realize their dogs can read their moods accurately,scientists have always been a little doubtful.Now thanks to some researchers at the University of Veterinary Medicine in Vienna,Austria,we finally have some convincing evidence.

    For their study,biologist Corson Miller and his team exposed eleven selected dogs to digital images of women that were either angry or happy.Half the dogs were rewarded for touching the screen when shown a happy face,while the other half got their treat for selecting those that appeared angry.

    Interestingly,the dogs were not provided with the entire face.Some dogs were shown only upper halves while the others observed lower halves.That's because the scientists believe humans show their emotions on their entire face.

    After some training like how to recognize small differences like the wrinkles between the eyes or the changes in their shape that accompany the happy or angry expressions,the dogs were mostly able to identify the correct expression not only on a familiar face but on a strange face.The researchers concluded the dogs were smart enough to read human emotions.

    They also found those being trained to read angry expressions took a longer time to learn.They guess it may be because dogs find angry faces disgusting,causing them to withdraw quickly.However,once the smart dogs realized they were getting rewarded,the trepidation seemed to disappear.In fact,the dogs had such a good time playing the computer "game" that scientists had a hard time keeping them away from the touch screens after the study was completed.

    The researchers also noticed only dogs with a male owner had a harder time understanding the expressions correctl. Since the touchscreen models were all females, this confirmed what has been observed in previous studies-dogs are more efficient at reading facial expressions of people that are the same gender as their owner.

    A survey has shown that what you do on a plane can be determined by which nationality is listed on your passport.

    According to the results of an international passenger survey, Australians are the biggest drinkers on board with 36 percent choosing to down the hatch, compared to 35 percent of Americans and 33 percent of Brits.

    The Airline Passenger Experience Association(APEX) spoke to around 1,500 people, aged 18 and older, who have travelled by plane at least once during the last three months and were living in the United States, United Kingdom, Germany, Japan, China, Singapore, Australia and Brazil.

    The results found Chinese travelers are most likely to nod off once the seat-belt sign switches off. They are also the first to take out their credit card for some in-flight shopping and the biggest fans of gaming. Americans on the other hand like to use their time in the air more productively—when not drinking—choosing to work while flying at 35,000 feet.

    Meanwhile, Brits and Germans are the best at making chat with random strangers—spending 50 percent more time than any other nationality. Comparatively, Brazilians conduct their conversations online via email, messaging apps or social media.

    Despite plane food having a bad reputation, seven out of ten interviewees said they were happy to eat up on the selection of in-flight snacks and meals. In-flight magazines were also popular with four out of five passengers.

    The international flyers did however express their desire for better in-flight entertainment. “The industry has greatly improved the comfort, entertainment and on board service, and passengers are accepting those improvements” said Russell Lemieux, APEX executive director. “At the same time, passengers are demanding more from their air travel experiences which will drive more improvements touching all aspects of the journey. ” he added.

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    When the sun sets in Hong Kong, the city skyline comes alive. Billboard（广告牌）lights flash, and light up the crowded streets. The colorful lights from the tall buildings are one of the city's main attractions.

    “Oh, my god. The lights are so amazing. We love it. It's so nice.” said one visitor.

    But this appreciation is not shared by everyone in Hong Kong. Lat year then government reported a record number of complaints. The curtains may be drawn. But residents argue the bright light outside is hard to escape. “We receive some complaints about the light pollution. They find it very hard to sleep or they have disturbance from the light outside.”

    Scientists at the University of Hong Kong spent 18 months studying levels of light pollution and collecting more than 5 million measurements. They found Hong Kong one of the world's worst “victims”. The lights pollution condition in Hong Kong was extremely severe. Particular in cities, the night sky brightness, as well as the lights, is a few hundred times over the level of that of a night sky without light pollution. In cities such as Seoul, London, Shanghai and Paris, billboard lighting is under control. And there are punishments for people who go against the law.

    But in Hong Kong, there are no laws. A volunteer regulation called Charter of External Light（户外灯光约章）encourages visitors to switch off between 11 p.m. and 7 p.m. The critics say it's not enough to make a difference. The government says 4800 businessmen have signed up to the Charter so far. And it's satisfied that it's working.

    But not everyone is convinced and some residents are taking upon themselves to act. Zoe Chow led a campaign to have a commercial building switch off their midnight. She won but she believes the lights will eventually turn back on. “I know that the building has signed the Charter of External Light. But it is voluntary, not mandatory（强制的）.

    A while back I caught a news report on something called couch surfing and the network of trusting souls who make this phenomenon possible. They offer to put up travelers free of charge and help them on their ways. At first, it sounded unbelievable. I mean, inviting strangers into one's home for one or two nights? Give me a break.

    However, I was intrigued. I decided to find it out. The only way to truly learn about this phenomenon was to dive in. So I planned a trip to Finland, a country I've always wanted to explore. I would couch surf at every stop there.

    If ever any anxiety existed when stepping into the unknown, it disappeared when my first host met me at the train station. Ari looked like my idea of a typical Finn: tall and blue-eyed. Finns were also supposed to be famously reserved (寡言少语的). Ari was anything but. He was a live wire, giving me a warm welcome and walking with me to his apartment, where he showed me the sleeper sofa, served me tea, and engaged me in warm conversations. He also handed me a key to come and go as I pleased.

    If this was what couch surfing was all about—trust and friendship—then I had gotten off to a good start. As I boarded my next train to continue my journey, I began to think about this couch-surfing idea. What encouraged these people to open their homes to strangers? I concluded that there was a desire to lend a hand to like-minded folks who might enrich their own lives.

    Seven cities in 14 days. Seven hosts. Seven new friends. If couch surfing taught me anything, it's this: Most people are good and generous. Where will couch surfing take me next? Who knows? But I can't wait to find out.