In the story of “The crow and the Pitcher” from Aesop's Fables, a thirsty 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. New Caledonian crows actually do understand how to make water displacement work to their advantage, experiments showed. The results suggest that the birds are, at least in some aspects, as smart as first-graders, according to the study.

    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 a bunch of heavy rubber erasers that would sink, and light plastic objects that would float. The crows found out that they could drop the heavy objects 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 tube 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. In contrast, 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 small amount of water at the bottom.

    Does this situation seem familiar to you? Your English is progressing well, the grammar is now familiar, the reading comprehension is no problem, you are communicating quite fluently, but: Listening is STILL a problem! First of all, remember that you are not alone. Listening comprehension is probably the most difficult job for almost all learners of English as a foreign language. The most important thing is to listen as often as possible. The first step is to find listening resources. The Internet is really a useful tool for English students. You can download The RealPlayer from RealMedia.com. The RealPlayer allows you to use the Internet like a radio station.

Once you have begun to listen on a regular basis, you might still be frustrated (懊恼) by limited understanding. What should you do?

    Here is some of the advice I give my students:

    Accept the fact that you are not going to understand everything.

    Stay relaxed when you do not understand — even if you continue not to understand for a long time.

    Do not translate what you hear into your native language.

    Listen for the general idea of the conversation. Don't concentrate on detail until you have understood the main ideas.

    I remember the problems I had in understanding spoken German when I first went to Germany. In the beginning, when I didn't understand a word, I insisted on translating it in my mind. This method usually resulted in confusion. Then, after the first six months, I discovered two very important facts. Firstly, translating creates a wall between the listener and the speaker. Secondly, most people repeat themselves constantly. By remaining calm, I noticed that — even if I didn't pay much attention, I could usually understand what the speaker had said.

    One of the biggest social issues in Japan is the increasingly low marriage rate among young people and the small birth rate, which led to an aging and eventually shrinking（萎缩） population. Most young Japanese women simply don't seem interested in having many children.

    Now what began in Japan is happening globally. As David Brooks wrote, birth rate is becoming smaller in much of the world, from Iran — 1.7 births rate per woman — to Russian, where low birth rates connected with high death rates mean the population is already shrinking. And this includes US, which has long had higher birth rates than most developed nations. Aging countries will face the burden of caring for large elderly populations without a larger resource of young workers.

    It's true that global aging is going to present some major challenges. Who will take care of the elderly? Will an older world be less active and slower to change and adapt? It's all true. Sometimes I worry about a coming generational war over resources, just as I worry about how I will take care of my own parents in their old age, just as I worry about who might take care of me.

    But here's the thing: an older world may have less pressure on the environment. As we all know, the environment is the real victim of overpopulation.

    So maybe a world that grows slower and grows older will put less pressure on the environment, and buy us a few more years to ensure our energy use, along with our birthrates, reaches a sustainable（可持续的）level. After all, we're supposed to get smarter as we got older. Hopefully that holds true for the planet as well.

    There's been a lot of talking about white-and-blue collar workers, and you may have even heard of gold collar workers, but lately a new color of collar is making its way into China's urban vernacular(土话)—green. Green collars say no when work is life and life is work. They choose to get out of the fast lane(车道), and explore new ways of living "green".

    Living green doesn't mean someone is working as an environmentalist, biologist or scientist. Instead it is more of a lifestyle choice. A typical green collar is well educated like a white-collar but physically tough like a blue-collar, likely born in the 70s or 80s of the last century and living in one of China's big cities, with a monthly income well above 5,000 yuan(about US $700).

    The life of a green collar may go something like this: Turn off the mobile phone after work, eat only healthy food rich in vitamins, go on hikes every weekend, and like to help the underprivileged.

    Green collars even have their own club. In Beijing, the Green Collar Club is for people who share a "be happy, healthy and helpful" spirit. The club often holds charity parties and uses the donations for environmental protection and poverty relief(摆脱贫困) projects in China.

    "They are successful in their careers, but do not miss the pleasures in life. They have a lot of money, but do not fall slave to it." said Zuo Shiguang, one of the founding members of the club.

    Do's and Don'ts in Whale(鲸)Watching The Department of Fisheries and Oceans has developed guidelines for whale watching in Johnstone Strait, where killer whales are found on a daily basis each summer. It is strongly recommended that vessel (船只) operators follow these guidelines for all kinds of whales.

    Approach whales from the side, not from the front or the back.

    Approach no closer than 100 metres, then stop the boat but keep the engine on.

    Keep noise levels down-no horns. whistles or racing of engines.

    Start your boat only after the whales are more than 100 metres from your vessel.

    Leave the area slowly, gradually moving faster when you are more than 300 metres from the whales.

    Approach and leave slowly, avoiding sudden changes in speed or direction.

    Avoid disturbing groups of resting whales.

    Keep at low speeds and remain in the same direction if travelling side by side with whales.

    When whales are travelling close to shore, avoid crowding them near the shore or coming between the whales and the shore.

    Limit the time spent with any group of whales to less than 30 minutes at a time when within 100 to 200 metres of whales.

    lf there is more than one vessel at the same observation spot, be sure to avoid any boat position that would result in surrounding the whales.

    Work together by communicating with other vessels, and make sure that all operators are aware of the whale watching guidelines.

Hobbs was an orphan. He worked in a factory and every day he got a little money. Hard work made him thin and weak. He wanted to borrow a lot of money to learn to paint pictures, but he did not think he could pay off the debts.

One day a lawyer said to him, "One thousand dollars, and here is the money. "As Hobbs took the package of notes, he was very dumbfounded. He didn't know where the money came from and how to spend it. He said to himself, "I could go to find a hotel and live like a rich man for a few days; or I give up my work in the factory and do what I'd like to do: painting pictures. I could do that for a few weeks, but what would I do after that? I should have lost my place in the factory and have no money to live on. If it were a little less money, I would buy a new coat, or a radio, or give a dinner to my friends. If it were more, I could give up the work and pay for painting pictures. But it's too much for one and too little for the other."

"Here is the reading of your uncle's will," said the lawyer, "telling what is to be done with this money after his death. I must ask you to remember one point, Your uncle has said you must bring me a paper showing exactly what you did with his money, as soon as you have spent it. "

"Yes I see. I'll do that, "said the young man.