Sometimes when I'm flying from one speaking engagement to another, I find myself sitting next to someone who's quite talkative. This is often a pleasant experience for me because I'm a people-watcher. I learn so much by watching and listening to the people I meet and see every day. I've heard stories of sadness and others of delight, fear and joy, and others that would rival those on “Oprah” and "Geraldo”.

    Sad to say，there are times when I'm sitting next to someone who just wants to vent(发泄） his temper or inflict(强加）his political views on an audience for 600 miles. It was one of those days. I settled in, as my seatmate began his speech on the terrible state of the world with the time worn, “You know, kids today are...” He went on and on, sharing vague notions of the terrible state of teens and young adults, based on watching the six o'clock news rather selectively.

    When I gratefully got off that plane and finally made it to my hotel in Indianapolis, I bought the local paper and went to have dinner in the hotel. There, on an inside page, was an article I believe ought to have been the front-page headline news.

In a little Indiana town, there was a 15-year-old boy with a brain tumor. He was undergoing radiation and chemotherapy(化疗）treatments，As a result of those treatments, he had lost all of his hair. I don't know about you, but I remember how I would have felt about that at his age —I would have felt awkward and ashamed.

    This young man's classmates willingly came to the rescue: all the boys in his grade asked their mothers if they could shave their heads so that Brian wouldn't be the only bald boy in the high school. There, on that page was a photograph of a mother shaving all of her sons' hair with the family looking on approvingly. And in the background, a group of similar bald young men.

    No, I don't despair about kids today.

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    My husband, my four-month-old daughter and I set out on a five-day driving journey from California to Washington. We had to stop frequently because our little child needed to stretch from the car seat.

    One of our stops, once we crossed the Oregon border, was at a Black Bear Diner. Walking towards the front door we noticed a gentleman standing at one side. He was clearly untidy, without shoes and wearing worn clothing. We passed right by him and opened the restaurant door. Then something told me to go back.

    Holding my daughter, I turned around and said to the gentleman, “Sir. Are you hungry?” He said, “Yes.” I then asked, “May we buy you something to eat?” He responded with, “Sure, I can order something myself.”

    My husband opened the door and the gentleman went straight to the counter. I told him to order whatever he wanted. The manager of the restaurant came over quite quickly and looked frightened. I spoke before he had an opportunity to say anything. “This gentleman will have lunch with us today,” I said. “Please add his order to our bill.” The manager said with a frown(皱眉), “Okay.” We turned to our table and the gentleman said, loudly and quickly, “Thank You!” We were seated and upon completing our meal we were handed our bill. I asked my husband what the gentleman had ordered. One fresh orange juice, one coffee, one breakfast combination with a side of hash browns.

    When we left the restaurant I looked for the gentleman but didn't see him, but that very small act just made my day. I hope in some small way we were able to add some joy to his life, even if only for a few minutes.

    Emily and Zach are confused! Their parents told them they could choose between Massachusetts and Arizona for their vacation this summer.

    Emily has always wanted to visit Boston, the capital of Massachusetts. Zach and she both agree that walking along the Freedom Trail would enable them to see Boston's most famous places of historic interest, like the site of the school Ben Franklin attended and the Old State House. If Emily and Zach went to Massachusetts, they could spend a few days at the beaches on Cape Cod. Emily loves body boarding, and Zach is great at body surfing. They both enjoy building sandcastles .

    Zach finds learning about Native Americans wonderful and has always wanted to travel along the Apache Trail in Arizona. This mountain highway passes Native American ruins in Tonto National Forest. Emily is not as interested in traveling along this trail as Zach, but they both would like to visit Phoenix, the capital, and then travel to Grand Canyon National Park and Meteor Crater (陨石坑). Zach learned in science class that Meteor Crater is a hole over 4,000 feet wide and 520 feet deep that was created when a huge object from space fell to Earth. The object went so deep that it has never been found. Zach would really like to try to discover it. But Emily thinks if experienced scientists and researchers cannot find it, Zach might as well not even bother (费工夫) to try.

    The only drawback for Zach and Emily if they choose Arizona would be the heat. It is very hot and dry in this southwestern state. Massachusetts, on the other hand, is in the northeastern United States. Here Zach and Emily and their parents could enjoy mild (温和的) temperatures. Their parents love hot weather, but Zach and Emily do not really like to sweat.

    How will they ever decide to which state they should travel? If only they could take two trips!

    What is the single most effective way to reduce greenhouse-gas emissions? Go vegetarian (素食)？ Replant the Amazon? Cycle to work? None of the above. The answer is: make air-conditioners better. On one calculation, replacing refrigerants (制冷剂) damaging the atmosphere would reduce total greenhouse gases equaling 90bn tonnes of CO₂ by 2050. Making the units more energy-efficient could double that. By contrast, if half the world's population gave up meat, it would save 66bn tonnes. Replanting two-thirds of tropical forests would save 61 bn tonnes. A one-third increase in global bicycle journeys, just 2.3bn tonnes.

    Air-conditioning is one of the world's great overlooked industries. Automobiles and air-conditioners were invented at roughly the same time, and both have had a huge impact on where people live and Work. Unlike cars, though， air-conditioners have drawn little criticism for their social impact, emissions or energy efficiency. Most hot countries do not have rules to govern their energy use. There is not even a common English word for “coolth” (the opposite of warmth).

    Yet air-conditioning has done more than most things to benefit humankind. Lee Kuan Yew, the first prime minister of Singapore, called it “perhaps one of the signal inventions of history”. It has transformed productivity in the tropics(热带地区)and helped turn southern China into the workshop of the World. In Europe, its spread has pushed down heat-related deaths to 10% since 2003, Men 70,000 people than usual, most of them elderly, died in a heatwave. For children, air-conditioned classrooms are associated with better grades at school.

    Environmentalists who call air-conditioning “a luxury we cannot afford” have half a point, however. In the next ten years, as many air-conditioners will be installed(安装)around the world as were put in between 1902(invention time)and 2005.Unless energy can be produced without carbon emissions, these extra machines will warm the world. At the moment, therefore, air-conditioners create a vicious cycle. The more the Earth warms, the more people need them. But the more there are, the warmer the world will be.

    Cutting the impact of cooling requires three things. First, air-conditioners must become much more efficient. The most energy-efficient models on the market today consume only about one-third as much electricity as average ones, Minimum energy-performance standards need to be raised raised, orintroduced in countries that lack them altogether, to push the average unit's performance closer to the standard of the best.

    Next, manufacturers should stop using damaging refrigerants. One type called hydrofluoro-carbons, is over 1,000 times worse than carbon dioxide when it comes to trapping heat in the atmosphere. An international agreement to knock out these pollutants will come into force in 2019.

    Last, more could be done to design offices, malls and even cities so they do not need as many air-conditioners in the first place. More buildings should be built with overhanging roofs or balconies for shade, or with natural ventilation (自然通风).Simply painting roofs white can help keep temperatures down. Providing indoor air-conditioned comfort need not come at the expense of an overheating world.

    Coming to the end of my assistantship in Barcelona, I start to think about what the future might hold.

    It's been seven months and a few days since I arrived here and things have changed so much in what some might call a short period of time. When I first arrived in Terrassa I was excited and nervous to start a new adventure in a country I love. The first few days seem so long ago now, trying to find a place to live, organizing my timetable with the schools, meeting new people.

    However, a fortnight later, the excitement started to fade and I began to spend more than a few nights thinking about family and friends back home, wondering if I should be there with them. Everything started to change after meeting some new friends and spending good time with them, eating together and seeing new places as a group. I suppose we should never forget how important it is to have good people in your life, because they can make a difference.

    Coming back to Terrassa after visiting home for Christmas felt like returning to a second home, to a place that was mine with people I cared about. Things got even busier and more people came into my life; new friends, romance and a whole lot of good food flowed by in what seems to have been weeks, not months.

    Now, looking forward, there are some decisions to make. Should I return home to Scotland and move on with life there or try to extend my time here, perhaps make it something permanent? Experiencing other cultures or learning about the world is such an important thing to do if you have the means.

    My advice from my experience so far is to travel and try new things whenever you get the opportunity. You may find somewhere you were always supposed to be.

    Have you ever been to a music festival? Well if you live in the UK, the answer is probably yes. The number of festivals has grown greatly over the last few years and now there are around 200 every summer. So let's look at the history of four famous festivals.

    The Glastonbury Festival is a five-day festival of contemporary (当代的) performing arts held most years in Somerset, in the south-west of England. There are a rock and pop stage, a jazz stage, the Avalon stage, a theatre comedy stage, a cinema tent, a dance tent and a circus (马戏团). The festival started in1970and about 120, 000 people go to it every summer.

    The Reading Festival is truly world-class with rock and pop bands (乐队) appearing from all over the world, particularly (尤其) the USA. About 80, 000 music fans go to Reading every August Bank Holiday. The festival first came to its present site on the banks of the River Thames in Reading in 1971, when it moved from Plumpton in Sussex. It is still on the same site over 47 years later!

    WOMAD stands for World of Music, Arts and Dance and was the idea of rock musician Peter Gabriel to promote (宣传) world music. The WOMAD Festival started in 1982 and takes place in July at Charlton Park, near Malmesbury in Wiltshire, and you can see different bands and musicians from all over the world. The festival welcomes over 26, 000 visitors each year.

    The one-day Monsters of Rock Festival at the National Bowl in Milton Keynes was first held in 1980 and gave visitors the chance to hear the very best of hard rock and heavy metal. There were no festivals between 1996 and 2003 as a result of changing musical fashions, but now it has returned and grown into a two-day festival with a campsite for the 30, 000 people who go there in summer days.