Early people lived by hunting animals and gathering grains. After a tribe(部落） had lived in an area for some time, its food supply would begin to reduce. Then the tribe had to move to new hunting grounds where there was more food.

    This way of life caused special problems for the tribes. They were forced to depend on luck, as well as on their hunting skills. If they could find no game, the whole tribe was in danger of starving. And when the hunters had good luck one day, they were not sure to find game the next time. The tribes moves often because much land was needed to support their people.

    Finally, people learned that they could grow their food. At first, the women of tribes raised patches of wild grain. Later, people discovered that they could plant their own seeds. Farming slowly became a way of life.

    As people turned away from hunting to farming, their life changed. When the food supply became more constant, they no longer moved from place to place. The success of their crops depended partly on the weather, but there were also things they could do to help crops grow.

    In the past, a tribe had to travel many miles for food. Now , only a small amount of land was necessary to feed the whole tribe. The tribe could grow in size because farming provided a way to feed people.

    It's rare that you see the words “shyness” and “leader” in the same sentence. After all, the common viewpoint is that those outgoing and sociable guys make great public speakers and excellent networkers and that those shy people are not. A survey conducted by USA Today referred to 65 percent of executives who believed shyness to be a barrier to leadership. Interestingly, the same article stresses that roughly 40 percent of leaders actually are quite shy—they're just better at adapting themselves to situational demands. Bill Gates, Warren Buffet and Charles Schwab are just a few “innies”.

    Unlike their outgoing counterparts who are more sensitive to rewards and risk-taking, shy people take a cautious approach to chance. Rather than the flashy chit-chat that defines social gathering, shy people listen attentively to what others say and absorb it before they speak. They're not thinking about what to say while the other person is still talking, but rather listening so they can learn what to say. Along the same lines, shy people share a common love of learning. They are intrinsically (内在地) motivated and therefore seek content regardless of achieving an outside standard.

    Being shy can also bring other benefits. Remember being in school and hearing the same kids contribute, until shy little Johnny, who almost never said a word, cut in? Then what happened? Everyone turned around to look with great respect at little Johnny actually talking. This is how shy people made good use of their power of presence: they “own” the moment by speaking calmly and purposefully, which translate to a positive image.

    Shyness is often related to modesty. Not to say that limelight-seekers aren't modest, but shy people tend to have an accurate sense of their abilities and achievements. As a result, they are able to acknowledge mistakes, imperfections, knowledge gaps and limitations.  Since shy people have a lower sensitivity to outside rewards than outgoing ones, they're more comfortable working with little information and sticking to their inner desires. Shy people are also more likely to insist on finding solutions that aren't primarily apparent. Don't believe me? Maybe you'll believe Albert Einstein, who once said, “It's not that I'm so smart, it's that I stay with problems longer.” Obviously, finding certainty where uncertainty is typically popular is a huge plus for any successful person.

    The myth that shy people are less effective leaders than their outgoing fellows is just a misunderstanding. Make wise use of your personality strengths to lead your business no matter what side of the range you fall on.

    Passenger Information

    Carry-on Bag Rules

    When travelling on China Southern planes, we ask our customers to follow our simple bag rules.

—Each passenger is allowed to bring one bag onto the plane.

—Weight limit: Each carry-on bag may weigh up to 10 kilos.

—Size limit: Each carry-on bag can be up to 110cm long, 60cm high and 30cm wide.

—Additional bags and oversized/overweight bags may be allowed on the plane if there is enough room. There will be a fee for such bags (see the table below). Please note that if your bag breaks more than one rule then you must pay a fee for each rule broken.

    Safety Rules

    For the safety of our passengers, the following items must not be taken onto the plane:

—Bottles containing gas (e.g. cigarette lighter)

—Bottles containing any cream, oil or other liquid that are over 100ml.

    Note:

    If you have any liquid medicines over 100ml that you must use during your flight, please contact our customer service manager on 34533566 to make arrangements at least 24 hours before your departure. You will need to have a doctor's letter explaining why you need the medicine.

    Bag Fees

    No bag over 15 kilos will be allowed on the plane. **No bag over 150cm long or 80cm high may be taken on the plane. Passengers must put such bags in the plane's storage.

    Next time you hear a funny joke you'd better not laugh too hard. According to a paper published by the British Medical Journal, laughter isn't always the best medicine. Sometimes it can even be harmful. Professor Robin Ferner from the University of Birmingham, one of the authors of the study, found that bad things could happen to people who laughed too much. He says, "We found people with heartbeat problems which had stopped their hearts, we found people who had fainted(昏倒), and we found people who'd dislocated their jaws or burst their lungs."

    It seems that laughing can be no laughing matter. But it's not all doom and gloom. Professor Ferner says there are benefits to laughing when you want to lose weight, for example. Yes, that's right: laugh and be slimmer! Professor Ferner explains that: "You use energy when you laugh, you move your diaphragm(横隔膜), you expand your lungs, and both those things can be helpful."

    According to the research, laughing for a quarter of an hour can burn 40 calories, and if you laughed all day you'd use about 2, 000 calories, which is what most people consume in a day. But don't do that or you might end up with a painful jaw. Ouch! Or you might find people looking at you in a funny way.

    But I don't want to finish this article leaving you feeling desperate. Laughter comes naturally for most of us. Babies begin to laugh at around 3-6 months. So give in to your sense of humour and keep smiling. Life is short anyway.

    I've worked part time since taking early retirement ten years ago. I was inspired by an older friend. We worked for the same company, and he retired two years before I was also considered “spare”, as some companies call it.

    Soon after I left work, we had lunch together. First, he assured me that there was life after work. Then he related his own experience. He didn't want to take another full-time job, so he turned his daughter's old bedroom into a home office. He arranged for some consulting work from our old company, and he picked up more projects from other contacts. Soon he was working 20 to 30 hours a week. He wasn't making as much money. His kids were grown-up, so he didn't need as much income. “As soon as I left that job,” he told me, “my back problems went away. I started to eat better and get more exercise, I make half as much money, but I feel twice as good, and I'm twice as happy.”

    I decided to follow a similar track. At the time, my younger child almost finished college, so my parental responsibilities were winding down. We sold our old house and moved into a townhouse. I went to work for myself. And the result? Today I, too, make less money. But we make ends meet. And I feel twice as good and twice as happy.

    Our experience isn't for everybody. But a lot of people have retired early and lived to tell the tale, which proves it possible. Jack, another friend, was a salesman for a communication firm. He had a long distance to work and did a lot of traveling. He decided to leave the corporate world, in part because he had health problems and he wanted to spend more time with his family. Later, he quit his job with flexible hours and was restored to his health. And now he has found a part-time job, and he, together with his family, is leading a more relaxing life.

    Are you a social media addict? Are you always checking your smart phone to see how many "likes" you've received for your latest post? Maybe you feel comforted by the sound that someone has sent you a message?

    Don't worry, you're not alone. We check our phones an average of 150 times a day, and around 30% of the total time spent online is devoted to social media. Some experts now fear this habit could be damaging our mental health.

    This is something particularly bothering young adults, according to a study from the University of Pittsburgh. It found the more they used social media, the more likely they were to be depressed. In tests, those people who checked social media frequently were 2.7 times more likely to be depressed compared to those who spent most of their time generally surfing the Internet, who had just 1.7 times the risk.

    Some of us certainly feel sad when we're ignored on social media sites, or when we see someone else having a better time than us. But depression is a more serious condition and clinical psychologist, Abigael San, recently told the BBC that ,"It's a real issue, and it's been getting significantly worse over the last 5﹣6 years. You can get so hooked that it takes you away from your real relationships. "However, Abigael does admit that social media is more likely to worsen pre﹣existing issues than directly cause them.

    Other research by the University of Glasgow found that teenagers are affected by the 24﹣hour demands of their social media accounts. It found that those with higher levels of emotional investment in social media, and who use it at night, were more likely to feel depressed and anxious.

    Despite these warning signs, why do some of us continue to keep clicking? Well, I suppose we all want to be liked and we don't want to miss out on a conversation that's taking place online. But we need to know when to switch off our virtual online world and connect with the real world instead.