On a Saturday morning earlier this September, the world got its first look at the Strati. This electric vehicle is unlike any other currently on the road. It rolls on four wheels, but its body and chassis(底盘) weren't built in a factory. Instead, Strati's designers used a technology called 3-D printing. It created those parts of the car in one piece, from the ground up.

    “Compared to a typical vehicle on the road, the Strati definitely looks different,” says Greg Schroeder, a senior research engineer at the Center for Automotive Research in Ann Arbor, Mich. He did not work on the new car. His organization studies trends and changes in th e auto industry.

    It took 44 hours to print the new car at the International Manufacturing Technology Show in Chicago. Over the next few days, the car's designers installed additional parts. These included the car's engine, brakes and tires. Then, early on September 13, Jay Rogers climbed into the car, started its engine and drove the vehicle onto the street. Rogers helped found Local Motors. It's the Arizona-based company behind the Strati. Two weeks later, his team printed a second Strati, and just as fast, at a fair in New York City.

    Justin Fishkin, a local Motors official, sees the Strati as a window into the future. Today, car buyers are limited in their choice of a vehicle. They can order only what car companies have already designed. But in the future, he says, you may be able to design your own car online and then get it printed to order.

    Manufacturing experts say 3-D printing has begun to revolutionize how they make things. The technology has been around for decades. But these machines used to be so expensive that only large companies could afford them. In the last few years, though, that has changed. Many of the machines are now inexpensive enough for small companies—or even individuals —to own. Some local libraries make them available to the public. High Schools are beginning to use them in classrooms. Wide access to these printers means people can now design and print a wide variety of new things.

    The car's printer is a one-of-a-kind device.

    The technology behind the 3-D printer used in Chicago is an example of additive manufacturing. This proce ss builds solid objects, slice by slice, from the bottom up. (“Strati” means layers, in Italian.) A mechanical arm moves a nozzle from one side to another, back and forth. As it moves, the nozzle deposits a liquid—often melted plastic or metal (but it could be food, concrete or even cells) —that quickly hardens or bonds to become solid or semi-solid. This creates a single, thin layer. Once a layer is complete, the printer starts depositing the next one.

    “There's a lot of interest in 3-D printing in the auto industry,” says Schroeder. Right now, the technology is particularly useful for building models of cars or car parts.

    To compete with current auto manufacturers, the 3-D printer would have to increase in a hurry, Schroeder says. By contrast, he notes, a Ford F-150 pickup truck rolls off an assembly line at a rate of roughly one per minute. To print as many Stratis would require many more printers. Schroeder says he doesn't see 3-D printing soon taking over for such high-volume manufacturing. But, he adds, “Who knows what will h appen in the long term?”

    Scientists at Oak Ridge National Laboratory in Tennessee designed the 3-D printer used in Chicago. Lonnie Love, a research scientist at the lab, led the effort.

    Additive manufacturing often is slow and expensive. It also may produce materials that are unreliable, Love says. So for two years, his team searched for ways to make 3-D printing better. They built new machines and tested them over and over.

    All of that work paid off: their new machine is fast and uses less expensive material than earlier printers. In addition, it prints a plastic embedded with fibers of carbon to produce a stronger material. This helps ensure the material won't crack or break under pressure.

    He's an old cobbler（修鞋匠）with a shop in the Marais,a historic area in Paris.When I took him my shoes,he at first told me: “I haven't time.Take them to the other fellow on the main street ; he'll fix them for you right away.”

    But I'd had my eye on his shop for a long time.Just looking at his bench loaded with tools and pieces of leather,I knew he was a skilled craftsman（手艺人）.“No,” I replied,“the other fellow can't do it well.”

     “The other fellow” was one of those shopkeepers who fix shoes and make keys “while-U-wait”-without knowing much about mending shoes or making keys.They work carelessly,and when they have finished sewing back a sandal strap（鞋带）you might as well just throw away the pair.

    The man saw I wouldn't give in,and he smiled.He wiped his hands on his blue apron（围裙）,looked at my shoes, had me write my name on one shoe with a piece of chalk and said,“Come back in a week.”

    I was about to leave when he took a pair of soft leather boots off a shelf.

     “See what I can do?” he said with pride.“Only three of us in Paris can do this kind of work…”

    When I got back out into the street,the world seemed brand-new to me.He was something out of an ancient legend,this old craftsman with his way of speaking familiarly,his very strange,dusty felt hat,his funny accent from who-knows-where and,above all,his pride in his craft.

    There are times when nothing is important but the bottom line,when you can do things any old way as long as it “pays”,when,in short,people look on work as a path to ever-increasing consumption（消费）rather than a way to realize their own abilities.In such a period it is a rare comfort to find a cobbler who gets his greatest satisfaction from pride in a job well done.

    It was an autumn morning shortly after my husband and I moved into our first house. Our children were upstairs unpacking, and I was looking out of the window at my father moving around mysteriously on the front lawn. “What are you doing out there?” I called to him.

    He looked up, smiling. “I'm making you a surprise.'' I thought it could be just about anything. When we were kids, he always created something surprising for us. Today, however, Dad would say no more, and caught up in the business of our new life, I eventually forgot about his surprise.

    Until one gloomy day the next March when I glanced out of the window, I saw a dot of blue across the yard. I headed outside for a closer look. They were crocuses (番红花) throughout the front lawn—blue, yellow and my favorite pink, with little faces moving up and down in the cold wind. I remembered the things Dad secretly planted last autumn. He knew how the darkness and dullness of winter always got me down. What could have been more perfectly timely to my needs?

    My father's crocuses bloomed (开花) each spring for the next five seasons, always bringing the same assurance: Hard times are almost over. Hold on, keep going, and light is coming soon.

    Then a spring came with only half the usual blooms and the next spring there were none. I missed the crocuses, so I would ask Dad to come over and plant new bulbs (块茎植物). But I never did. He died suddenly one October day. My family were in deep sorrow, leaning on our faith.

    On a spring afternoon four years later, I was driving back when I felt depressed. It was Dad's birthday, and I found myself thinking about him. This was not unusual-my family often talked about him, remembering how he lived up to his faith. Suddenly I slowed as I turned into our driveway. I stopped and stared at the lawn. There on the muddy grass with small piles of melting snow, bravely waving in the wind, was one pink crocus.

    How could a flower bloom from a bulb more than 18 years ago, one that hadn't bloomed in over a decade? But there was the crocus. Tears filled my eyes as I realized its significance.

    Hold on, keep going, and light is coming soon. The pink crocus bloomed for only a day, but it built my faith for a lifetime.

C

    While famous foreign architects are invited to lead the designs of landmark buildings in China such as the new CCTV tower and the National Center for the Performing Arts, many excellent Chinese architects are making great efforts to take the center stage.

    Their efforts have been proven fruitful. Wang Shu, a 49-year-old Chinese architect, won the 2012 Pritzker Architecture Prize — which is often referred to as the Nobel Prize in architecture — on February 28. He is the first Chinese citizen to win this award.

    Wang serves as head of the Architecture Department at the China Academy of Art (CAA). His office is located at the Xiangshan campus(校园) of the university in Hangzhou, Zhejiang Province. Many buildings on the campus are his original creations.

    The style of the campus is quite different from that of most Chinese universities. Many visitors were amazed by the complex architectural space and abundant building types. The curves(曲线) of the buildings perfectly match the rise and fall of hills, forming a unique view.

    Wang collected more than 7 million abandoned bricks of different ages. He asked the workers to use traditional techniques to make the bricks into walls, roofs and corridors. This creation attracted a lot of attention thanks to its mixture of modern and traditional Chinese elements(元素).

    Wang's works show a deep understanding of modern architecture and a good knowledge of traditions. Through such a balance, he had created a new type of Chinese architecture, said Tadao Ando, the winner of the 1995 Pritzker Prize.

    Wang believes traditions should not be sealed in glass boxes at museums. "That is only evidence that traditions once existed," he said.

"Many Chinese people have a misunderstanding of traditions. They think tradition means old things from the past. In fact, tradition also refers to the things that have been developing and that are still being created," he said.

    "Today, many Chinese people are learning Western styles and theories rather than focusing on Chinese traditions. Many people tend to talk about traditions without knowing what they really are, "said Wang.

    The study of traditions should be combined with practice. Otherwise, the recreation of traditions would be artificial and empty, he said.

    Throughout history scientists have risked their health and their lives in their search for the truth.

    Sir Isaac Newton, the seventeenth century scientist, was very smart, but that didn't stop him from doing some pretty stupid things. In his laboratory in Cambridge he often did the strangest experiments. Once, while testing how light passes through lenses (晶状体), he put a long needle into his eye, pushed it to the back, and then moved it around just to see what would happen. Luckily, nothing long-lasting did. On another occasion he stared at the sun for as long as he could bear, to discover what effect this would have on his sight. Again he escaped suffering permanent damage, though he had to spend some days in a darkened room before his eyes recovered.

    In the 1750s the Swedish chemist Karl Scheele was the first person to find a way to produce phosphorus (磷). He in fact discovered eight more chemical elements including chlorine (氯), though he didn't get any praise for them. He was a very clever scientist, but his one failing was a curious habit of tasting a little of every substance he worked with. This risky practice finally caught up with him, and in 1786 he was found dead in his laboratory surrounded by a large number of dangerous chemicals, any of which might have been responsible for his death.

    Eugene Shoemaker was a respected geologist. He spent a large part of his life studying craters (火山口) on the moon, and how they were formed, and later did research into the comets of the planet Jupiter. In 1997 he and his wife were in the Australian desert where they went every year to search for places where comets might have hit the earth. While driving in the Tanami desert, normally one of the emptiest places in the world, another vehicle crashed into them and Shoemaker was killed on the spot. Some of his ashes (骨灰) were sent to the moon aboard the Lunar Prospector spacecraft and left there — he is the only person who has had this honor.

    Ivy Granstrom

    Ivy Granstrom was born with impaired vision(弱视) and got a serious back injury at the age of 60 during a car accident. She participated in cold English Bay swimming events for 76 years and was therefore sometimes known as the Queen of the Polar Bear Swims.

    Gerry Hewson

    Gerry Hewson was a member of Australian Men's National Wheelchair Basketball Team. He won a gold medal in the 1996 Summer Paralympics. He coached for the West Sydney Razorbacks from 2004 to 2006.He was named as a lifetime member in recognition of the efforts he made for the promotion of wheelchair basketball. Discussing the appeal of wheelchair basketball, he commented that,“There is a coating at the edge of the rim(轮辋) that actually lights up like a spark(火花), and it stays for about two to three seconds. That is quite exciting and great fun.”

    April Holmes

    April Holmes lost her left leg below the knee because of a train accident in 2001. Remembering it she said, “I had a life-changing accident in January, 2001. And fortunately I have been able to get back to doing what I love, and that's track and field.” Through hard work, she made records in the 100, 200, and 400 meter events. To live her life to its full potential, she has set up a non-profit(非营利的) organization, the April Holmes Foundation, to help people with learning or physical disabilities while being a role model for them.

    Shauna Maria Whyte

    Shauna Maria Whyte was born in Canada in 1967. She has won many prizes in cross-country skiing competitions since 1975. In 1991, during a horseback riding competition, Shauna broke her back. She did not surrender to this change in her life, and she started using a sit sled(雪橇).