One form of social prejudice against older people is the belief that they cannot understand or use modern technology. Activities like playing computer games, going on the Net and downloading MP3s are only for the youngsters. Isn't it unfair that older people enjoying a computer game should be frowned(皱眉) upon by their children and grandchildren?

    Nowadays older people have more control over their lives and they play a full part in society. Moreover, better health care has left more people in their sixties and seventies feeling fit and active after retirement. Mental activity, as well as physical exercise, can contribute to better health. Playing computer games is a very effective way of exercising the brain.

    When personal computers were first introduced, most older people didn't believe they would ever familiarize themselves with it. Now computers have been around for a few generations and retired people have gradually become more relaxed about using them for fun. Gamers over 65 prefer playing puzzle games and card games. Kate Stevens, aged 72, says: “I find it very relaxing. It's not very demanding, but you still need to concentrate.”

    Another development that has favored “grey games” is a change in the type of videogames available on the market. There's a greater variety of games to choose from, including more intellectual and complex strategy(策略) and simulation(模拟) games. Internet Chess and Train Simulator are among the most popular of these. Train Simulator is based on real-world rail activities. Players can choose from a variety of challenges, such as keeping to a strict-timetable and using helper engines during a winter storm.

    Some people argue that “grey gamers” simply don't have the skills required for computer games, and that teenagers are better. This couldn't be further from the truth. Most computer games require the kind of analytical thinking that improves with practice, which means that the “grey gamers” may well be far better than gamers half a century younger than them. In games where speed is the main consideration, older people would be at a disadvantage because they may have slower reaction times. On the other hand, “grey gamers” have a preference for slower paced, mind challenging games.

    Each time I see a balloon, my mind flies back to a memory of when I was a six-year-old girl. It was a rainy Sunday and my father had recently died. I asked my mom if Dad had gone to heaven. "Yes, honey. Of course." she said.

    "Can we write him a letter?"

    She paused, the longest pause of my short life, and answered, "Yes."

    My heart jumped. "How? Does the mailman go there?" I asked.

    "No, but I have an idea." Mom drove to a party store and returned with a red balloon. I asked her what it was for.

    "Just wait, honey. You'll see." Mom told me to write my letter. Eagerly, I got my favorite pen, and poured out my six-year-old heart in the form of blue ink. I wrote about my day, what I learned at school, how Mom was doing, and even about what happened in a story I had read. For a few minutes it was as if Dad were still alive. I gave the letter to Mom. She read it over, and a smile crossed her face.

    She made a hole in the corner of the letter where she looped the balloon string. We went outside and she gave me the balloon. It was still raining.

    "Okay, on the count of three, let go. One, two, three."

    The balloon, carrying my letter, darted upward against the rain. We watched until it was swallowed by the mass of clouds.

    Later I realized, like the balloon, that Dad had never let his sickness get him down. He was strong. No matter what he suffered, he'd persevere, hang on, and finally transcend this cold world and his sick body. He rose into sky and became something beautiful. I watched until the balloon disappeared into the gray and white and I prayed that his strength was hereditary. I prayed to be a balloon.

    One of the greatest gifts one generation can give to other generations is the wisdom it has gained from experience. This idea has inspired the award-winning photographer Andrew Zuckerman. He interviewed and took photos of fifty oversixty-fiveyearsold all over the world. His project explores various aspects of their lives. The photos and interviews are now available on our website. Click on the introductions to read the complete interviews.

    Let us now have a culture of peace.——Federico Mayor Zaragoza, Spain Federico Mayor Zaragoza obtained a doctorate in pharmacy (药学) from the Complutense University of Madrid in 1958. After many years spent in politics, he became Director General of UNESCO in 1987. In 1999, he created the Foundation for a Culture of Peace, of which he is now the president. In addition to many scientific publications, he has published four collections of poems and several books of essays.

    Writing is a discovery.——Nadine Gordimer, South AfricaDue to a weak heart, Nadine Gordimer attended school and university briefly. She read widely and began writing at an early age. She published her first short story at the age of fifteen, and has completed a large number of works, which have been translated into forty languages. In 1991, Gordimer won the Nobel Prize for Literature.

    Jazz is about the only form of art today.——Dave Brubeck, USADave Brubeck studied music at the University of the Pacific and graduated in 1942. After World War Ⅱ he was encouraged to play jazz. In 1951, he recorded his first album(专辑). Brubeck's 1959 album has become a jazz standard. He received a Grammy Lifetime Achievement Award in 1996.For more figures CLICK HERE.

    The most famous war movies reflect the American public's continuous fascination with World War II and the Vietnam War. Many movies of this kind have been well-received when they were first shown, but few of them have enjoyed lasting fame and popularity. The films on the list of the five most famous war movies still remain fresh and are popular among many people.

    A society that lives by the plastic fork may very well die from it. That's how things are looking. Anyway, for a world so used to disposable(一次性的) habits, any hope for a solution(解决方案) also increasingly seems to be buried.

    Sure, there have been some hopeful ideas. Boyan Slat, the Dutch inventor developed a plan for Covering the Great Pacific Garbage Patch. Not long after it started, Slat's system experienced "material fatigue(疲劳)"-likely the result of being strained(使受到压力) by all that trash-and the task was delayed.

    All the while, the plastic increases. Its growth is very fast, according to Linda Wang, a professor of chemical engineering at Purdue University. She says, "We'll have more plastic than fish by 2050." Yet Wang, along with other researchers at Purdue, may have a solution not only to this plastic problem, but also to the growing need for clean energy.  Her team has developed a system that turns waste, a durable, lightweight material that accounts for about a quarter of all plastic waste, into a highly pure form of gasoline.

    Publishing their findings in the journal Sustainable Chemistry and Engineering, the scientists' state that instead of making plastic go away, they can break it down and reuse it, using chemistry to destroy what chemistry brought to the world when plastic was developed back in 1907.

    The process uses "supercritical" water-heated to around 450 degrees Celsius (842 degrees Fahrenheit),beyond the key point at which distinct liquid and vapor phases(气液态) exist-to boil plastic waste into an oil, the researchers explain. It takes a couple of hours for the supercritical water to complete the transformation, but the result is a kind of oil that can be used as gasoline or fuel. It can also be turned into other products.

    The researchers have only made the transformation in a laboratory setting so far, but they suggest turning the process to a commercial scale(规模) may not be far off. And considering the 300 million tons of plastic into the environment every year, that day can't come soon enough. But it will come in time.

    Allen Cook and his daughter Melissa were renovating(整修) her house, when they found a beautiful, heart-warming love story. "The envelope in the ceiling was old and yellow. It had never been opened, It was unbelievable when my son-in-low started reading it. In the letter she was talking about the baby she was going to have," Allen Cook said.

    The story began in May 4, 1945, the typed letter was written by a woman named Virginia to her husband, Rolf Christoffersen. At the time, he was a sailor in the Norwegian navy. The envelope was marked "return to sender" and never found its way to her husband. Allen's daughter used the Internet to find the phone number of someone named Rolf Christoffersen and gave him a call, leading her to his son in Santa Barbara, California.

    "Someone called me at my office. They just googled my name because I have the same name as my father. Melissa asked me where I grew up and I told her. She told me she had the letter," Christoffersen's son, 66 now, said. The younger Christoffersen wasn't yet born when his mother Virginia wrote the letter, but he said her words were very special to him. His mother, who died six years ago, wrote about her love for her husband.

    "I love you Rolf, as I love the warm sun, and that is what you are for my life, the sun about which everything else revolves around me," she wrote. Seventy-two years later, her words were finally heard by her husband. Christoffersen immediately called his father, who is now 96. And read the letter to him over the phone. "I was so surprised after all these years. I was very emotional," the elder Christoffersen said.

    The long-lost letter was finally received just before Mother's Day; it was another tangible connection to Virginia Christoffersen. "It's Mother's Day and reading her words reminded me just what a wonderful person she was and how much she loved us" her son said, through tears.