A man once said how useless it was to put advertisements in the newspapers．“last week, ”said he, “my umbrella was stolen from a London church．As it was a present, I spent twice its worth in advertising, but didn't get it back．”

    “How did you write your advertisement?” asked one of the listeners, a merchant．

“Here it is,” said the man, taking out of his pocket a slip cut from a newspaper．The other man took it and read, “Lost from the City Church last Sunday evening, a black silk umbrella．The gentleman who finds it will receive ten shillings on leaving it at No.10 Broad Street．”

    “Now, ”Said the merchant, “I often advertise, and find that it pays me well ． But the way in which an advertisement is expressed is of extreme importance．Let us try for your umbrella again, and if it fails, I'll buy you a new one．”

The merchant then took a slip of paper out of his pocket and wrote：“If the man who was seen to take an umbrella from the City Church last Sunday evening doesn't wish to get into trouble, he will return the umbrella to No.10 Broad Street．He is well known．”

    This appeared in the paper, and on the following morning, the man was astonished when he opened the front door．In the doorway lay at least twelve umbrellas of all sizes and colors that had been thrown, and his own was among them．Many of them had notes fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter．

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Carol: I started playing the cello（大提琴）when I was about eight or nine. It was great playing the cello because I was in youth orchestras and we went abroad to do tours. But anyway, when I got to university, I stopped playing. Well, there just wasn't time and there were so many other things to do. Luckily, I took it up after my 25^th birthday and joined a band.

Daniel: When I was little, I thought I'd end up learning the guitar like my father, but then I decided that I wanted to have my own instrument, so I chose the trumpet（小号）. I'm in the school jazz band and I'd like to be a musician when I grow up, but my dad says it's difficult to make a living from music. But I don't want to be a lawyer like him. It's so boring.

Carmen: Nobody likes living near someone like me because when I practice, I make a lot of noise! But you have to keep practicing, don't you? Otherwise it gets more and more difficult. The trouble is, in the summer, when it's hot, I have to open the windows, so the whole street gets to hear it if I'm not careful. I love playing the drums and I play in a fantastic band.

Vince: I've played the guitar for as long as I can remember, but when I was trying to make it as a musician after school, I used to play in the Underground in London to make a bit of extra money. I kept on playing, but I ran a restaurant to make a living. When I get any spare time I still play. I've got a few friends who like music too and we have formed a band.

    Long before they can actually speak, babies pay special attention to the speech they hear around them. Within the first month of their lives, babies' responses to the sound of the human voice will be different from their responses to other sorts of hearing stimulation. They will stop crying when they hear a person talking, but not if they hear a bell or the sound of a rattle. At first, the sounds that a baby notices might be only those words that receive the heaviest emphasis and that often occur at the ends of utterances(讲话，说话). By the time they are six or seven weeks old, babies can detect the difference between syllables pronounced with rising and falling tones. Very soon, these differences in adult stress and intonation can influence babies' emotional states and behavior. Long before they develop actual language comprehension, babies can sense when an adult is happy or angry, attempting to begin or end new behavior, and so on, merely on the basis of clues such as the rate, volume, and melody of adult speech.

    Adults make it as easy as they can for babies to pick up a language by exaggerating(夸张) such clues. One researcher observed babies and their mothers in six diverse cultures and found that, in all six languages, the mothers used simplified utterances and nonsense sounds, and transformed certain sounds into baby talk. Other researchers have noted that when mothers talk to babies who are only a few months old, they exaggerate the pitch, loudness, and intensity of their words. They also exaggerate their facial expressions, hold vowels(元音) longer, and emphasize certain words.

    More significant for language development than their response to general intonation is observation that tiny babies can make relatively fine distinctions between speech sounds. In other words, babies enter the world with the ability to make those precisely perceptual（知觉的，感性的） recognition that are necessary if they are to acquire listening language.

    Babies obviously obtain pleasure from sound input, too: even as young as nine months they will listen to songs or stories, although the words themselves are beyond their understanding. For babies, language is a sensory-motor delight rather than the route to boring meaning that it often is for adults.

    The idea that computers have some amount of "intelligence" is not new, says Ralph Haupter, the president of Microsoft Asia, pointing as far back as 1950 when computer pioneer Alan Turing asked whether machines can think. "So it has taken nearly 70 years for the right combination of factors to come together to move AI from concept to reality," says Haupter.

    It is predicted that the development of artificial intelligence will be the story of the coming generations, not just the coming year, but as 2019 gets underway, you'll find AI will begin to touch your life in many ways according to some researchers.

"Personal assistant AIs will keep getting smarter. As our personal assistants learn more about our daily routines, I can imagine the day I need not to worry about preparing dinner. My AI knows what I like to eat, which days of the week I like to cook at home, and makes sure that when I get back from work all my groceries are waiting at my doorstep, ready for me to prepare that delicious meal I had been longing for." —Alecjandro Troccoli, senior research scientist, NVIDIA.

"Thanks to AI, the face will be the new credit card, the new driver's license and the new barcode (条形码). Facial recognition is already completely transforming security with biometric capabilities being adopted, and seeing how technology and business are connected, like Amazon is with Whole Foods, I can see a near future where people will no longer need to stand in line at the store." —Georges Nahon, president, Orange Institute, a global research laboratory.

"2019 will be the year AI becomes real for medicine. By the end of the year we're seeing solutions for population health, hospital operations and a broad set of clinical specialties quickly follow behind." —Mark Michalski, executive director, Massachusetts General Hospital.

On an autumn afternoon, a remote sheep farm in southern Greenland is quiet. The silence is abruptly broken when dozens of sheep come thundering across the hills overlooking the farm. Walking after them are Lars Nielsen and his 37-year-old son Kunuk Nielsen.

The Nielsen family has owned and run the farm since 1972. Kunuk says the summers now are longer than when he was a child and that drought has become a problem. The fields are not so green as those in the old days. He has to buy hay (草料) from European countries.

The effects of a warming climate are obvious on the land. While he intends to struggle on, his older brother Pilu has chosen a different path.

Pilu, 40, lives in Qaqortoq in the south of Greenland -- a town of about 3,000 people. Ten years ago, he got his helicopter pilot's license and is now part owner of a small company called Sermeq Helicopters. It caters to construction and telecommunication workers and an increasing number of foreign tourists.

Pilu says he loves his family's sheep farm. But he saw that warming temperatures were making remote areas of Greenland more accessible and wanted to look for other opportunities. His company's most popular tours include a visit to Greenland's glaciers.

The warming temperatures are also affecting traditional ways of life, particularly hunting. The sea ice is changing; it's becoming less so that hunting on ice becomes more difficult. When there's no sea ice, it's difficult to use dog sledges (雪橇), and the whole culture around having dogs and dog sledges and doing traditional hunting on the ice is sort of diminishing.

Besides, many Greenlanders, like Pilu, are leaving the countryside for towns and the capital city Nuuk, where opportunities are greater. A report found that Nuuk's share of Greenland's population grew from 17.2% in 1977 to 29.2% in 2014. If there were enough houses in Nuuk, the share would even be bigger.