According to a recent study out of the University of Pennsylvania's Wharton School, men with shaved heads are considered to be more manly, powerful, and successful than those with longer hair or thinning(稀少的) hair. Besides, in some cases, they are considered to have greater leadership potential (潜力). That may explain why the power-buzz look has become popular among business leaders in recent years.

    Albert Mannes, Wharton management lecturer, said he was encouraged to do the research after noticing that he was treated with more respect when he shaved off his thinning hair.

    Mannes did three experiments to test people's impression of men with shaved heads. In one of the experiments, he showed 344 subject photos of the same men in two versions: one showing the men with hair and the other showing them with their hair digitally removed, so their heads appear shaved. In all three tests, the subject report found the men with shaved heads are more dominant(占优势的) than their hairy counterparts(对应的人).

    The study found that men with thinning hair were viewed as the least attractive and powerful. For those men, the solution could be as cheap and simple as a shave.

    New York image consultant Julie Rath advised her clients to get closely cropped when they start thinning up top. “There is something really strong, powerful and confident about laying it all bare(光秃的),” she said, describing the thinning look as kind of raunchy(不修边幅的).

    Not everyone needs a bare head. Rick Devine, 55, the CEO of Devine Capital Partners, advised executive candidates attracted by their clippers to keep their hair closely cropped, rather than completely shaved. “It is way too much image risk,” he said, “The best thing you can do in a business meeting is to make your look not an issue.”

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    For kids and many adults,a San Diego vacation means theme parks and other attractions.Before heading to a park,call or check its website for updated hours of operation; many parks have seasonal or holiday hours.Ticket prices listed here are for general admission（入场费）,single-day use only.

Sea World San Diego

    A 6-minute ride called Journey to Atlantis,which is to open in late May,tells the legend of the island nation. After the ride of Greek fishing boats,folks can visit a new exhibit of dolphins,which have not been on display at the park since 1998.

    DETAILS: General admission is $46.95 for adults,$37.95 for children aged 3-9,free for children 2 and younger. 1-800-380-3203 or www.seaworld.com.

San Diego Zoo

    There's not much in the way of new attractions.The zoo has a new panda cub（幼兽）,Mei Sheng.Nighttime Zoo, a program popular with families,starts June 26.

    DETAILS: General admission is $21 for adults,$14 for children aged 3-11,free for children 2 and younger. 1-619-234-3153 or www.Sandiegozoo.com

Maritime（海的）Museum of San Diego

    The HMS Surprise,the 18th-century British warship featured in the film Master and Commander,is on exhibit through Nov.30.

    DETAILS: The ship is available for tours from 9 am to 8 pm daily.Admission is $8 for adults,$6 for seniors and children aged 13-17,$5 for kids aged 6-12,and free for kids 5 and younger.1-619-234-9153 or www.sdmaritime.org.

Old Town Trolley Tours

    Visiting relatives or friends in San Diego? They can get a hometown pass and ride for free with your paid admission.

    DETAILS: The main ticket booth（售票亭）is in Old Town at 4010 Twiggs St.Hours are from 9 am to 5 pm, daily $25.www.historictours.com.

    On a snowy and windy afternoon, Ann, a ten-year-old girl, went out to play. She was walking along the sands when she was blown into a ditch (壕沟) by the seashore. She was frightened and tried her best to climb out. But the ditch was too deep and she was too weak to get out of it. So Ann cried at the top of her voice for help. But what she could hear over the snow ditch was nothing but the terrible noise of the wind. Nobody came to her and nobody knew where she was. She struggled again and again. Her face was struck by the strong wind, snow and sand, and was almost frozen. Her hands were stiff. She also felt that she was worn out. She started to cry hopelessly. Just at the moment Ann saw a black dog appearing through the heavy snow. It was Victor, her true friend. He was glad to see the sign of life. And the dog set out to work as soon as he got to Ann. He cleaned away the snow around her with his own paws and hind legs, and then reached out his big strong fur head to Ann. The little girl closed her arms round Victor's neck. The dog backed away slowly, pulling her out of the ditch little by little.

    Successfully, Ann got out of the ditch at last. Then she struggled to her feet. With great difficulty, led by her true friend Victor, she was rescued. Victor, the black dog, was given a gold medal and was honoured as Brave Hero Dog of America.

    Is beauty something always positive? Almost everyone thinks attractive people are happier and healthier, have better marriages and have more respectable jobs. Personal advisors give them better advice for finding jobs. Even judges are softer on attractive defendants. But in the executive（主管的） circle, beauty can become a disadvantage.

    While attractiveness is a positive factor for a man on his way up the executive ladder, it is harmful to a woman. Handsome male executives were considered having more honesty than plainer men; effort and ability were thought to lead to their success. Attractive female executives were considered to have less honesty than unattractive ones; their success was connected not with ability but with factors such as luck.

    All unattractive women executives were thought to have more honesty and to be more capable than the attractive female executives. Why are attractive women not thought to be able? An attractive woman has an advantage in traditionally female jobs, but an attractive woman in a traditionally manly position appears to lack the manly qualities required.

    This is true even in politics, “When the only clue is how he or she looks, people treat men and women differently, ” says Anne Bowman, who recently published a study on the effects of attractiveness on political candidates（候选人）. She asked 125 college students to rank two groups of photographs, one of men and one of women, in order of attractiveness. The students were told the photographs were of candidates for political offices. They were asked to rank them again, in the order they would vote for them.

    The results showed that attractive males completely defeated unattractive men, but the women who had ranked most attractive unchangeably received the fewest votes.

    In the years ahead, AI will raise three big questions for bosses and governments. One is the effect on jobs. Although bosses publicly praise the broad benefits AI will bring very much, their main interest lies in cutting costs. One European bank asked a technology company to find a way of reducing the staff in its operations department from 50,000 to 500. This special report has shown that AI-enhanced tools can help reduce staff in departments such as customer service and human resources by a large amount. The McKinsey Global Institute finds that by 2030 up to 375m people, or 14% of the global workers in companies or countries, could have their jobs automated away. Bosses will need to decide whether they are prepared to offer and pay for retraining, and whether they will give time off for it. Many companies say they are all for workers developing new skills, but not at the employer's expense.

    A second important question is how to protect privacy as AI spreads. The Internet has already made it possible to track people's digital（数字的）behaviour in extremely small detail. AT will offer even better tools for businesses to monitor consumers(客户) and workers, both online and in the physical world. Consumers are sometimes happy to go along with this if it results in personalised（个性化的）service. But AI probably brings privacy violations (侵犯) that are seen as shocking and morally unacceptable. In the wrong hands, useful technology could be against fair and equal treatment. Countries with a record of the careful watching of a person place, especially by the police or army and human-rights abuses already using AI to monitor political activity. The police around the world will use AI to spot criminals, but may also look on ordinary citizens secretly, in order to discover things or find out information about them. New rules will be needed to ensure agreement on what degree of monitoring is acceptable.

    The third question is about the effect of AI on competition in business. Today many firms are competing to provide AI-enhanced tools to companies. But a technology company that achieves artificial intelligence could race ahead of competitors, put others out of business and lessen competition. This is unlikely to happen in the near future, but if it did it would be of great concern.