It was a weeknight. We were a half dozen guys in our late teens, hanging around “the flat” — as usual. The flat was poorly furnished, which, after some time, grew tiresome. We wanted action.

    We got in a car, big enough for all of us to crowd into — and off we went, in search of adventure. We soon found ourselves at Blue Gum Corner, a place named after the huge old blue gum tree that stood by there, a well-known local landmark. It stands at a minor crossroad leading to our town. The trunk is tall and smooth with no handholds for climbing. About six metres from the ground the first branch sticks out over the road. We parked beneath the huge old tree and discussed what we might do. All of a sudden we hit upon an idea — a hanging! I was chosen as “hangee”.

    The plan was quite simple. As I stood upon the roof of the car, the rope (绳子) was threaded down my jacket through my collar and down one leg of my jeans. I put my foot through the loop at the bottom. There I hung, still. The boys rolled about laughing until, a car, I hear a car! Before they ran to hide in the nearby field, they gave me a good push so that “the body” would swing as the car drove by.

    To our disappointment, the car simply turned off for town without even slowing. The boys came out of their hiding places and we discussed the situation. Surely they had seen me, hadn't they? Then we heard another car. The act was repeated, but still without any obvious reaction. We played the game about five or six times, but as no one seemed to notice, we abandoned the trick.

    What we did not know was that every car that had passed had unquestionably seen “the body” and each one, too scared to stop, had driven directly to the local Police Station. Now at that time of the night, the local policeman was sound asleep in his bed, so the first person sent to the scene was the traffic officer that happened to be on duty that particular night. He had been informed that some person had been killed, by hanging, at Blue Gum Corner. When he arrived, the body was gone! And he was hearing “unnatural sounds” from the surrounding area. As far as he knew, some fierce animal was hiding in the field before him, possibly dragging a body behind him — and we thought we were scared!

    He went to his radio and made a call that really began to worry us. I lay so close that I could hear every word. He called for the “armed police” and a “dog team, better make it two” and he had a “serious situation” at Blue Gum Corner. Then the police officer arrived. After a briefing from the traffic officer he decided not to go into the field until armed police and dog teams arrived. Now two spotlights were on the field and none of us could move.

    As luck would have it, police cars cannot leave their spotlights on all night without charging their batteries. So, after a time, the two officers began lightening the field by turns, allowing us the opportunity to move on our fours for freedom. One by one, we all managed to steal away and make our way home. Behind us we left what must have looked like a small city of lights, police cars, roadblocks, barking dogs, armed officers and an old rope hanging from a tree.

    When I think back to that night, to that tree, to what the drivers of the cars think happened, to what police believe happened, and to what I know happened, I am reminded of a simple truth — our eyes see darkness and light, color and movement, our ears hear only vibrations (振动) in the air. It is how we explain these vivid pictures that shapes our “reality”.

    Even nowadays there is a lot of misunderstanding between nationalities. Let's have a look at what the following people have to say.

    Maria Conti: I find the English people insincere, cold and unfriendly. They keep saying "Thank you", "I'm sorry" even when they don't know each other. They are even polite to their own relatives. Except for helping you find your way in the streets, they aren't really friendly and never invite you to their houses.

    Giannis Stinios: On the contrary I found them broad-minded and friendly.I was invited to people's houses and they all showed great interest in my ideas,Greek life and people.In England I learned that it was possible to be warm, friendly and polite at the same time.

    Judy Brown: I lived in both Italy and Greece for a few years.At first there were a few misunderstandings between my foreign friends and myself. For example, I once gave a Greek friend a present for her birthday party.I was rather sorry that she did not unwrap it immediately. What's more, she even didn't thank me until I asked her if she liked it.I've learned from different experiences that a lot of foreigners find our attitude to what we English people call politeness rather insincere. They feel that politeness isn't necessary between friends.

    In the story of “The crow and the Pitcher” from Aesop's Fables, a thisty crow (乌鸦)drops stones into a narrow jar to raise the low level of water inside so he can take a drink.

    Now scientists have evidence to back up that story. Crows actually do understand how to make water displacement (移位) work to their advantage, experiments show. The results suggest that the birds are, at least in some aspects, as smart as first-graders.

    Researchers, led by Sarah Jelbert at the University of Auckland in New Zealand, presented six crows with tubes filled with water. Inside the tubes, a worm or piece of meat on a piece of wood was floating, just out of reach of the crow. In front of the tubes, the researchers arranged several rubber erasers that would sink, and some plastic objects that would float. The crows found out that they could drop the erasers into the tubes in order to raise the water level and get their snack.

    However, the birds handled awkwardly in experiments in which they could choose to drop objects in either a wide tube or a narrow one to get a snack, the researchers said. Dropping objects into narrow tube would lift the water level by a greater amount and put the treat within reach after just two drops; while it took around seven drops to raise the snack to the same level in the wide tube. The crows obviously didn't realize this, and most of them went for the wide tube first.

    Previous studies showed that chimps and human children can solve similar tasks. In a 2011 study, chimps and kids found out that they could put water into a tube to reach a peanut that was floating in a small amount of water at the bottom.

    Alibaba started taking the lead in China by connecting big Chinese manufacturers（制造商）with big buyers across the world. Its business-to-business site, Alibaba.com allowed business to buy almost everything. Alibaba's advantage wasn't hard to judge: size. Alibaba is just big, even by Chinese standards. Its market attracts 231 million active buyers, 8 million sellers, 11.3 billion orders a year—and Alibaba is just the middleman. It encourages people to use its markets—not charging small sellers a percentage of the sale.

    If you want a quick look into the influence of Alibaba on daily Chinese life, take my experience. I moved to Beijing a year ago and quickly got tired of visiting small stores across the crowded, polluted city of 20 million people in search of new electronics, bathroom furnishings, and anything else my wife wanted. “You're looking for what exactly? Why not try it?” My Chinese teacher asked me one day. With that, my wonderful new relationship with Alibaba began.

    Alibaba's original business-to-business model now is second to consumer buying. Chinese retail（零售）buying makes up 80% of Alibaba's profit, and leading that group is Taobao, with 800 million items for sale and the most unbelievable selection of things you'll ever find. TMall.com is Alibaba's other big site, where you can find brand name goods from Nike and Unilever near the lowest prices.

    What I have a hard time explaining to friends and family back in the U.S.is how China has gone beyond traditional shopping—big-box retailers especially—in favor of online purchases on Taobao and a few other sites. In smaller towns than Beijing, where big retailers have not yet traveled, shopping online is shopping, and shopping is Taobao.

    I have a list of some of my recent purchases on Taobao for a sense of how wide the marketplace is. Almost everything arrived a day or two after ordering with free shipping. I'm not even a big buyer, because I need friends to help me search the Chinese-language site. When I was searching my purchase history on my Chinese teacher's iPad, which helps me buy goods, I looked through with great difficulty about 10 of her purchases for every one of mine.

    Duolingo — iOS/Android

    Have you ever wanted to learn another foreign language? You might say: "English is hard enough  I don't want to go through that again."

    Relax — learning a foreign language doesn't always mean you have to sit in class and take endless exams. An app named Duolingo has been designed to help you memorize new words and grammar in creative ways, such as online lessons, games and interesting exercises.

    Named "the best language-learning app" by The Wall Street Journal, Duolingo currently offers 30 languages, including English, French, Spanish, German, Italian, Portuguese, Irish, Dutch, Danish, and Swedish.

    Headspace: Meditation & Sleep— iOS

    With homework to finish tests to prepare, it can seem like you don't have a moment to relax and gather your thoughts. What's to be done?

    Meditation(冥想)may help, and here's an app to get you started. Headspace teaches you to face some of the toughest problems of everyday life. It has courses on work and productivity, personal growth and how to deal with troubling emotions like anger and fear. There are also courses designed specifically for kids and students about dealing with distraction and homesickness.

    And, if that isn't enough, Headspace can help us with the biggest single cause of stress and anxiety: lack of sleep. The combination of the app's calming voices and relaxing music will help you get a good night's rest, ready to face the challenge of the next day with optimism and energy.

    Gentle Wakeup — Sleep & Alarm Clock with Sunrise — iOS/Android

    Every device(仪器)has an alarm function these days. But what does this app have to offer?

    The makers of Gentle Wakeup believe people can wake up w ell. The key is that the app wakes with light rather than sound. It offers a better move out of sleep through a "Sunrise" — a light slowly, gradually becomes brighter, just as the sun does. But the sunrise is only half of the waking process: The light grows for 20 minutes before you are eased out of your sleep by the natural early morning sounds of birdsongs. The makers believe users of the app will never wake up in the same w ay again: "Start getting awake by light and you will never w ant to wake up by sounds again".

    Forest: Stay focused — iOS/Android

    Though phones make life more convenient, many people feel that they are addictive. Forest is a clever intervention(干预)designed to make people understand that there's more to life than phones.

    Here's how it works: you plant a seed in the app and the longer you stay away from the phone, the more it grows. From a seed, it becomes a tree and then a forest at last. The makers say, the "sense of responsibility and achievement will encourage you to stay away from your phone and focus on what's important in life". And Forest has received some good review s from users, who say that's exactly what it does: "It's a phone game that gives you time rather than taking it away."

    Curiosity is what drives us to keep learning, keep trying, keep pushing forward. But how does one generate (产生) curiosity, in oneself or others? George Loewenstein, a professor of psychology at Carnegie Mellon University, offered an answer in the classic1994 paper, "The Psychology of Curiosity."

    Curiosity arises, Loewenstein wrote, "when attention becomes focused on a gap in one's knowledge. Such information gaps produce the feeling of deprivation (匮乏) labeled curiosity. The curious individual is motivated to obtain the missing information to reduce the feeling of deprivation." Loewenstein's theory helps explain why curiosity is such a force: it's not only a mental state but also an emotion, a powerful feeling that drives us forward.

    Scientist Daniel Willingham notes that teachers are often "so eager to get to the answer that we do not devote enough time to developing the question." Yet it's the question that stimulates (刺激) curiosity; being told an answer stops curiosity before it can even get going.

    In his 1994 paper, George Loewenstein noted that curiosity requires some basic knowledge. We're not curious about something we know absolutely nothing about. But as soon as we know even a little bit, our curiosity is aroused and we want to learn more. In fact, research shows that curiosity increases with knowledge: the more we know, the more we want to know. To get this process started, Loewenstein suggests, take steps with some interesting but incomplete information.

    Language teachers have long used communication in exercises that open an information gap and then require learners to communicate with each other in order to fill it. For example, one student might be given a series of pictures for the beginning of the story, while the student's partner is given a series of pictures showing how that same story ends. Only by speaking with each other (in the foreign language they are learning, of course) can the students fill in each others' information gaps.