Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

    Sometimes, the word green means young, fresh and growing. Sometimes, it describes something that is not yet ripe or finished. For example, a greenhorn is someone who has no experience, who is new to a situation. In the fifteenth century, a greenhorn was a young cow or ox whose horns(角) had not yet developed. A century later, a greenhorn was a soldier who had not yet had any experience in battle. By the eighteenth century, a greenhorn had the meaning it has today—a person who is new in a job.

    Someone who has the ability to grow plants well is said to have a green thumb. The expression comes from early nineteen hundreds. A person with a green thumb seems to have a magic touch that makes plants grow quickly and well. You might say that the woman next door has a green thumb if her garden continues to grow long after your plants have died.

    The Green Revolution is the name given some years ago to the development of new kinds of rice and other grains. The new plants produced much larger crops. The Green Revolution was the result of hard work by agricultural scientists who had green thumbs.

    Green is also the color used to describe the powerful feeling, jealousy(嫉妒). The green-eyed monster is not a frightening creature from outer space. It is an expression used about four hundred years ago by British writer William Shakespeare in his play “Othello”. It describes the unpleasant feeling a person has when someone has something he wants. A young man may suffer from the green-eyed monster if his girlfriend begins going out with someone else. Or, that green-eyed monster may affect your friend if you get a pay rise and he does not.

    The most frightening words in the English language are, “Our computer is down.” You hear it more and more when you are on business. The other day I was at the airport waiting for a ticket to Washington and the girl in the ticket office said, “I'm sorry, I can't sell you a ticket. Our computer is down.”

    “If your computer is down, just write me out a ticket.”

    “I can't write you out a ticket. The computer is the only one allowed to do so.”

    I looked down on the computer and every passenger was just standing there drinking coffee and staring at the black screen. Then I asked her, “What do all your people do?”

    “We give the computer the information about your trip, and then it tells us whether you can fly with us or not.”

    “So when it goes down, you go down with it.”

    “That's good, sir.”

    “How long will the computer be down?” I wanted to know.

    “I have no idea. Sometimes it's down for 10 minutes, sometimes for two hours. There's no way we can find out without asking the computer, and since it's down it won't answer us.”

    After the girl told me they had no backup(备用) computer, I said. “Let's forget the computer. What about your planes? They're still flying, aren't they?”

    “I couldn't tell without asking the computer.”

    “Maybe I could just go to the gate and ask the pilot if he's flying to Washington, ” I suggested.

    “I wouldn't know what gate to send you to. Even if the pilot was going to Washington, he couldn't't take you if you didn't't have a ticket.”

    “Is there any other airline flying to Washington within the next few hours?”

    “I wouldn't know,” she said, pointing at the dark screen. “Only 'IT' knows. 'IT' can't tell me.

    By this time there were quite a few people standing in lines. The word soon spread to other travelers that the computer was down. Some people went white, some people started to cry and still others kicked their luggage.

Festivals in Wales this spring

    There's lots to see, do and experience in Wales this spring. And now it's time to embrace all things new and get ready to be entertained in the spring, come rain or shine.

    Wrexham, 10-12 May

    The annual festival showcases over 200 acts consisting of music, comedy, film and more. Since its opening event in 2011, Focus Wales has done a lot for emerging（新兴的）musicians across the country, and 2018 sees Welsh Music Prize winner The Gentle Good and Y Selar Best Band winners. Candelas, take the stage.

    Aberystwyth, 19-29 May

    Whether you prefer Hill Climbs or Sportives, the AberCycle Festival allows you to take all of it in from the saddle（鞍）of a bike, enjoying the world's most beautiful scenery. However, all work and no play makes us all dull boys and girls, so while you're in town be sure to pop in to one or two of the plenty of pubs in Aber（as the locals call it）for a nice, cold pint of Brains beer. You'll need it after all that cycling!

    Hay on Wye, 25-28 May

    The world's biggest music and philosophy festival returns in 2018 with its unique mix of tunes, talks and trapeze（吊杠）（yes, there are even circus performers!） Based in the magical surroundings of Hay on Wye, this four day festival takes place at the end of May and is perfect for everyone who likes a side of intellectualism（理智主义）with their traditional festival experience.

Lawrenny, 25-28 May

    In late May in the heart of the Pembrokeshire National Park, the Big Retreat Wales takes place. Essentially the festival is about wellness, but it's also so much more than that. Join in this May for four days of “fed good”, leaving your usual routine behind and diving into a delightful mix of workshops, activities, music and sustainable food produce.

    It seems hard to watch someone yawn（打哈欠）and not to yawn ourselves. Even reading about yawning can make you do it. Now, a new study has found why yawning has such a powerful force.

    Yawning when others yawn, the study suggests, is a sign of pity and a form of social connection. Kids don't develop this deeply rooted behavior until around age four, the study found. Kids with autism (自闭症) are less likely to catch yawns. In the most serious cases, they never do. Yawning might help doctors to see whether the children are developing rightly. The work could also lead to a better understanding of the ways that people communicate and connect.

    “Emotional infection seems to be a born thing that connects us together,” said Molly Helt, a graduate student in psychology at the University of Connecticut. “Yawning may be part of that.” Inspiration for her study came when she tried to get her own autistic son to clear his ears on an airplane. She repeatedly yawned at him, hoping he would yawn back. He never did.

    “The fact that autistic kids don't do it might mean they're really missing out on that emotional connection with people around them,” she said. “The biggest thing people try to figure out after birth is how we become humans and understand that humans have minds that are different from others',” she added. “Autistic people never seem to understand that.”

    Like infectious（有感染力的）laughter and crying, scientists have found that yawning is a shared experience that promotes social connection. Helt said it could fight stress after a period of being nervous and spread a feeling of calm through a group.

    From self-driving cars to carebots for elderly people, rapid development in technology has long represented a possible threat to many jobs normally performed by people. But experts now believe that almost 50 percent of occupations existing today will be completely unnecessary by 2025 as artificial intelligence continues to change businesses.

    "The next fifteen years will see a revolution in how we work, and a revolution will necessarily take place in how we plan and think about workplaces," said Peter Andrew, Director of Workplace Strategy for CBRE Asia Pacific.

    A growing number of jobs in the future will require creative intelligence, social skills and the ability to use artificial intelligence.

    The report is based on interviews with 200 experts, business leaders and young people from Asia Pacific, Europe and North America. It shows that in the US technology already destroys more jobs than it creates.

    But the report states: "Losing occupations does not necessarily mean losing jobs — just changing what people do." Growth in new jobs could occur as much, according to the research.

    "The growth of 20 to 40 person companies that have the speed and technological know-how will directly challenge big companies," it states.

    A 2014 report by Pew Research found 52 percent of experts in artificial intelligence and robotics were optimistic about the future and believed there would still be enough jobs in the next few years. The optimists pictured "a future in which robots do not take the place of more jobs than they create," according to Aaron Smith, the report's co-author.

    "Technology will continue to affect jobs, but more jobs seem likely to be created. Although there have always been unemployed people, when we reached a few billion people there were billions of jobs. There is no shortage of things that need to be done and that will not change," Microsoft's Jonathan Grudin told researchers.

    There have always been a lot of commonly believed but false ideas about being fat and doing exercise. Some people believe that they can't help putting on weight as they get older, while others hold that if they stop exercising, their muscles will turn into fat. Here are some more myths:

I'll never lose weight — I come from a fat family.

Wrong! While we can't change the body type we are born with, we can't blame our genes for making us fat. There's plenty of evidence that fatness runs in families, and the main reason is that they share the same habits of eating too much and exercise too little.

    I am fat because I burn calories slowly.

Wrong! Fatness is not caused by a slow metabolism (新陈代谢). If fact, although fat people consume more energy that slim people, they also fail to realize how much they eat! Keeping a diary can help you work out your daily food intake more accurately.

    Exercise is boring.

    Wrong! Anything will become boring if you do it many times. The key is to develop a balanced and varied program that's fun as well as progressive. If you enjoy a Sunday walk, take a different route. If you do Yoga, try a tai chi class. If you like swimming, set yourself a distance or time challenge.

    No pain, no gain.

    Wrong! Exercise is not meant to hurt. Indeed, pain is your body telling you something's wrong, and continuing to exercise could lead to serious injury. You may experience mild discomfort as you begin to exercise regularly, but this your body adapting to the positive changes in your lifestyle and the aches should disappear relatively quickly. If you don't, rest and seek medical advice.