Technological change is everywhere and affects every aspect of life, mostly for the better. However, social changes are brought about by new technology are often mistaken for a change in attitudes.

    Walk down the drinks section at the supermarket.Look in the drink cooler in your local convenience store.A new drink is taking up more and more space on the shelves，and that drink is water.Bottled water sales in the US rose to 1.7 billion gallons in 2010 for plastic bottles alone，compared to total sales of only 700 million gallons in 1990. Whereas bottled water was once associated only with the rich and the privileged (特权阶层)，it is now regularly drunk by people at all income levels despite the fact that the price of bottled water can be between 240 and 10,000 times higher per gallon than tap water.What accounts for this surprising increase in demand?

    Traditionally，people have drunk bottled water for health reasons.The practice of “taking the waters” originated with the Romans，who believed that a person developed a healthy mind by building a healthy body.Across Europe，drinking or bathing in mineral water has been associated with the power to cure various diseases.Health spas at Evian in France and Pellegrino in Italy began bottling water so that their consumers could continue their treatments at home.The consumers in the 21st century are also concerned about health.However，in America，where the habit of drinking bottled water is relatively new，the concern is often more related to the purity or sterilization (消毒) of the water than to its mineral contents.Americans are often worried about the effects of the chemical pollution and other contaminants on the water supply.Many Americans view bottled water as a safe alternative to tap water.

    Further reasons for drinking bottled water are its usefulness as an aid to digestion，as a complement to a good meal in a restaurant，and for taste.City tap water is often treated with chlorine (氯) to guard against harmful micro­organisms.Chlorine，as well as metals from pipes and tanks used to distribute and store tap water，can leave behind an unpleasant taste.

    La Tomatina, Spain

    Tomato juice flows through the streets of Bunol on the last Wednesday of August as the worlds largest tomato fight happens. Festivities begin in the town square where there is a huge pole covered in soap and with a leg of ham at the top. Participants try to climb up the pole to get the ham as watchers throw buckets of water to them. After a gun is fired to signal the beginning of the fight, people catch the tomatoes and throw each other in the streets until the gun sounds again, marking the end of the event.

    Holi, India

    This spring festival is celebrated throughout the country in late February or early March. The two-day event celebrates the legend of Prahlad, who escaped unharmed from the fire of the evil Holika Dahan. People mark the event by lighting fires and throwing colored powder on one another Children load colored water into toy pistols called pichkari and take aim at passers-by. Holi is known as a happy celebration of the victory of good over evil.

    Burning Man, Nevada

    This infamous festival began in 1986 with the burning of a large figure to mark the summer solstice (夏至). It's since grown into a week-long annual event that draws more than 48,000 people to the Black Rock Dessert. It is held during the week before Labor Day. Participants set up camp in the desert to celebrate art.

    Songkran, Thailand

    This festival marks the Thai New Year, which is celebrated in the second week of April. This is the hottest time of the year in Thailand, so it makes sense that the biggest Songkran tradition is to throw water on people. Thais of all ages join in water fights, using buckets, hoses (软管) and water guns to celebrate the event.

    Most academics would view a post at an elite university like Oxford or Harvard as the crowning achievement of a career—bringing both honour and access to better wine cellars. But scholars desire such places for reasons beyond glory. They believe perching on one of the topmost branches of the academic tree will also improve the quality of their work, by bringing them together with other geniuses with whom they can collaborate and who may help spark new ideas. This sounds reasonable. Unfortunately，as Albert Laszlo Barabasi of Northeastern University，in Boston (and also, it must be said, of Harvard), shows in a study published in Scientific Reports, it is not true.

    Dr Barabasi and his team examined the careers of physicists who began publishing between 1950 and 1980 and continued to do so for at least 20 years. They ranked the impact of the institutions these people attended by counting the number of citations each institution's papers received within five years of publication. By tracking the association of individual physicists and counting their citations in a similar way, Dr Barabasi was able to work out whether moving from a low to a high-ranking university improved a physicist's impact. In total, he and his team analysed 2,725 careers.

    They found that, though an average physicist moved once or twice during his career, moving from a low-rank university to an elite one did not increase his scientific impact. Going in the opposite direction, however, did have a small negative influence. The consequence is that elite university do not，at least as far as physicists are concerned，add value to output. That surprising conclusion is one which the authorities in countries such as Britain, who are seeking to concentrate expensive subjects such as physics in fewer, more elite institutions—partly to save money, but also to create what are seen as centers of excellence—might wish to consider.

    Helen Keller was one of America's best-known women. She was admired for her courage and achievements although she couldn't see or hear. She was also known throughout the world for herself-sacrificing work to improve the condition of the blind, the deaf and the speechless. When she died on June 1, 1968, the newspaper Washington Post wrote: "Her life was truly one of the most remark able phenomena of our time and her death just short of the age of 88 leaves the whole world poorer."

    Helen Keller was born on June 27th, 1880, in Tuscumbia, Alabama. For the first 19 months of her life, she was a pretty and happy baby, normal in every way. Then a sudden illness destroyed her sight and her hearing. Because she could not hear sounds to imitate(模仿), she could not speak. Helen used to say that her real birthday was not June 27th, 1880, but March 3rd, 1887—the day when Anne Sullivan entered her life. It was Anne Sullivan who taught Helen to spell certain words by a special system, Braille, and even to talk.

    Anne Sullivan could not teach Helen Keller to speak until some other important things had been learned. The little girl had to learn to control her actions and feelings. She had to learn that she could not always do what she wanted to do. She had always been able to get what she wanted by using force. The teacher had to change such habits without breaking the child's spirit.

    Miss Sullivan's battle began. Sometimes, there was real fighting between the wild child and the strong young teacher. At last, however, the battle was won by Miss Sullivan, who succeeded in showing Helen that she loved her and wanted to help her. The child and her teacher became friends. They continued to be friends until the teacher's death, fifty years later.

    The day on which Helen finally accepted Miss Sullivan as her friend and teacher was a great day in Helen's life. After that, the teacher could begin to teach the child language.

    Here are some exciting holidays to make your travel fun and a learning adventure.

    Salsa Dancing Holiday, Cuba

    In Cuba, many all-inclusive resorts(全包式度假胜地) offer free salsa lessons as part of their services, but there are many travel routes available through travel companies that will arrange for dance lessons over the course of your two-week stay, as well as an opportunity to taste authentic Cuban cooking, lifestyle and music. By the end of your holiday, you will be a dancing expert!

    Big Life Stretch, Spain

    Travel opens up opportunities that you do not have at home. Leaving your familiar surroundings might open your mind and bring changes. Big Life Stretch is one-way holiday near Malaga, Spain, in the mountains. You will spend a week surrounding yourself by nature. Guests participate in the scheduled life coaching, and also learn the techniques to hug changes.

    Photography Holiday, Spain

    Taking pictures is a major part of every holiday, but how many of us are good at it? Why not take this opportunity to learn how to really record your travel memories during the trip? In scenic Torrox, Spain. Photography Holiday offers 8-day-long all-inclusive vocations (room and board), photography workshops and personalized photography tours. The holiday includes traditional Spanish homes, the mountains and the sightings of sunrise over Lake Vineula.

    Wild Cookery, Scotland

    If you are looking for a cooking holiday for a change, consider Wild Rose Outdoor Cookery courses. Head out to Scottish Highlands for the weekend, where you will hunt for greens and other cooking materials and learn about ways of cooking outdoors, like fireside cookery, hot stones and pit (坑)cooking.