What are the biggest problems that society will have to deal with in the new age? There re diseases like AIDS and cancer. There's climate change, of course. And what about producing enough cheap food and energy for the world's growing population? Who's going to solve all these terrible problems? Yes, politicians and world leaders will have a big part to play. Yes businesses will need to create the economic wealth to pay for some of these things. But who's going to make a much greater difference to something like AIDS or climate change. It's going to be a scientist. It is the scientist who can turn some new bit of science into a new technology to solve these problems. If you like thinking about the world around you, why not become a scientist? It doesn't mean you have to wear a white coat and plastic glasses and spend all your time in a lab as most people often imagine! Scientists do all kinds of amazing things that are actually interesting!

    Military scientists develop not only new weapons but new military technologies that could help make wars out of date. Forensic(法医的) scientists work with the police to find quite small clues to catch criminals. Scientists work in schools and colleges as the teachers and professors who will train tomorrow's scientists. Don't think a scientist is far away! Maybe you like cooking? You could be a food technologist helping to keep fruit and vegetables fresher for longer. Perhaps sport is your thing? Do you know that most top athletes work with sports scientists in order or improve their performance? You could even be the science writer who gets to spend the life studying the latest advances and sharing them with the world.

    Looking for something to do for the rest of your life? My advice? Take a long and hard look at science. It is interesting and ever.

    I have received many Christmas gifts over the years. The best gift I ever received was presented to me by a stranger. I never even knew his name and I only had contact with him for less than 60 seconds. His Christmas present to me changed the way I had thought about people and Christmas.

    It was several years ago when my wife asked me to meet her at the local department store on Black Friday morning. They had advertised a child's bike that she wanted to purchase for our son. We stood with a very large crowd, waiting for the manager to blow the whistle. After a while, the whistle blew. It was like throwing a bucket of fish into a tank of sharks. I told my wife that if we obtained a bike, fine, but we did not, I was OK with that too,

    As the shelf of bikes began to gradually decrease in size, I saw my polite opportunity to wrap my hands around the corner of one of the boxes. I lifted it off the box and suddenly felt some mild resistance. I looked up to see one of the largest gentlemen I had ever seen in my life. Threat was not the word to describe his presence. He was decorated with numerous belts of metal pointed leather around both arms and even his neck. Tattoos(文身) were an obvious passion of his.

    I started to return anxiously the box but he gently pushed it back in my direction and back into my hands. He then directed it into my shopping cart. He look d at me, smiled, and said, “Merry Christmas. ”My wife and I went to the checkout, paid for the bike and went home. All the way home I was thinking that this moment was by far the best Christmas gift I had ever received. The kindness of a stranger that broke all previous views I may have had of stereotypes and prejudices. I will never forget the tenderness of a human heart in a simple act.

    Mya Le Thai is a scientist studying at the University of California, Irvine. She recently discovered a process that may result in batteries that last forever. Thai said she had been discouraged that the batteries for her wireless devices degrade. Over time, they fail to charge fully.

    Thai did not like to have keep her wireless laptop connected to an electrical outlet. She decided to do something about that problem.

    At first, she and her team thought about inventing a new battery. But as they experimented, Thai discovered something that might permit lithium-ion(锂离子) batteries to last forever. Lithium-ion batteries power most wireless devices. Over time, the batteries lose the ability to hold a charge. Most of these batteries have a life span of about 7,000 charging cycles before they die.

    One of the reasons lithium-ion batteries degrade is their use of nanowires(纳米线) to carry electricity. Nanowires are extremely thin. A human hair is thousands of times thicker, for example. Nanowires are extremely efficient carriers of electricity, which makes them useful in batteries. But Thai said their thinness also makes them weak. "Nanowires break over time," she said. "That's why they lose capacity."

    But, Thai had a theory: The nanowires might last longer if covered with a material. She and the team tested her theory. The team tried many coverings for the wires. PMMA was one of them. The nanowires were coated with PMMA and cycled through charges 200,000 times. The PMMA coated nanowires showed no evidence of damage. The results suggest that batteries could last forever, without losing charging ability.

    Thai hopes to continue her research to understand why this material works so well and to see if any other material could create better results.

"It's kind of cool," she said. "I'm really glad people are showing interest in my work and not just in the work itself, but also in technology and energy."

    It was a cold winter day. A woman drove up to the Rainbow Bridge tollbooth(收费站). “I'm paying for myself, and for the six cars behind me,” she said with a smile, handing over seven tickets. One after another, the next six drivers arriving at the tollbooth were informed, “Some lady up ahead already paid your fare.”

    It turned out that the woman, Natalie Smith, had read something on a friend's refrigerator: “Practice random(随意的) kindness and senseless acts of beauty.” The phrase impressed her so much that she copied it down.

    Judy Foreman spotted the same phrase on a warehouse(仓库) wall far away from home. When it stayed on her mind for days, she gave up and drove all the way back to copy it down. “I thought it was beautiful,” she said, explaining why she'd taken to writing it at the bottom of all her letters, “like a message from above.” Her husband, Frank, liked the phrase so much that he put it up on the classroom wall for his students, one of whom was the daughter of Alice Johnson, a local news reporter. Alice put it in the newspaper, admitting that though she liked it, she didn't know where it came from or what it really meant.

    Two days later, Alice got a call from Anne Herbert, a woman living in Marin. It was in a restaurant that Anne wrote the phrase down on a piece of paper, after turning it around in her mind for days.

    “Here's the idea,” Anne says. “Anything you think there should be more of, do it randomly.” Her fantasies(想象) include painting the classrooms of shabby schools, leaving hot meals on kitchen tables in the poor part of town, and giving money secretly to a proud old lady. Anne says, “Kindness can build on itself as much as violence can.”

    The acts of random kindness spread. If you were one of those drivers who found your fare paid, who knows what you might have been inspired to do for someone else later. Like all great events, kindness begins slowly, with every single act. Let it be yours!

    Uber

    Uber is available in over 70 cities throughout 40 countries worldwide. You can either choose a typical Uber unmarked car or a regular taxi. The app can show you where drivers are, so you know how long you'll be waiting. You can also get fare quotes(报价)in advance. Your payment source is linked to the app and is automatically charged, so no physical money is ever needed.

    Lyft

    Lyft is a service that is also available in many large cities in the US. However, it offers something different, one of which is Lyft Line. With this service, you can find people that take the same route on a daily basis as you and split the fare with them. Lyft's regular service lets you easily see where rides are, catch one, and easily pay right within the app.

    Easy Taxi

    Easy Taxi is available in 86 cities across 26 countries and lets you quickly browse through maps and find locations you'd like to be picked up at. From there, just make sure there are taxis in your area. Confirm your ride and then pay for it within the Easy Taxi app. Once you book a ride, you should see the taxi's plate number and phone number appear on the map, making it easy for you to pick out both the car and the driver.

    Curb

    Curb, formerly Taxi Magic, is currently available in around 60 cities across the United States as well as select cities in the United Kingdom, Canada, and Mexico. It ties in with taxi companies and their drivers. As your taxi makes its way to your location, you'll be able to track its progress inside the app. You can link a payment account to Curb to pay your fare through the app. You can also pay in cash.

    Nelson Mandela is respected and admired around the world. And to South Africans he is a superstar. He is a hero who shocked the world by fighting for peace between races, despite the 27 years he spent in the prison of the South Africa's white, racist regime (种族主义政权).

    Mandela who won the nation's first all-race elections after the fall of apartheid (种族隔离) in 1994, retired in 1999. But he remains as popular as ever. His popularity has inspired an entire national industry. His portrait (肖像) has appeared at many places, including on some goods. His face has appeared on a South African coin, and some business leaders hope to build a statue in his likeness—the Statue of Freedom. It would stand taller than New York's Statue of Liberty.

    “His popularity is similar to that of John F. Kennedy with US or Winston Churchill in Britain, but few politicians in his times have achieved his level of admiration,” said Tom Lodge, head of the political science department of the University of the Witwatersrand, “What a skilled performer Mandela has been throughout his political career! He's a very, very clever man.”

    However, he is far from perfect. Most articles for his birthday, which appeared in every major South African newspaper on the day, briefly mentioned that Mandela did have his shortcomings.

    Then they returned to their flowing praises. “Through the ages, the human race has had its icons (偶像)—men and women who rose above ordinary people to inspire their generations,” The Mail and Guardian Weekly said. “In our generation, the gods presented us Nelson Mandela.”