When I told my father that I was moving to Des Moines, Iowa, he told me about the only time he had been there. It was in the 1930s, when he was an editor of the literary magazine of Southern Methodist University（SMU）in Dallas, Texas. He also worked as a professor at SMU, and there was a girl student in his class who suffered from a serious back disease. She couldn't afford the operation because her family was poor.

    Her mother ran a boardinghouse in Galveston, a seaside town near Houston, Texas. She was cleaning out the attic（阁楼）one day when she came across an old dusty manuscript（手稿）. On its top page were the words, “By O. Henry”. It was a nice story, and she sent it to her daughter at SMU, who showed it to my father. My father had never read the story before, but it sounded like O. Henry, and he knew that O. Henry had once lived in Houston. So it was possible that the famous author had gone to the beach and stayed in the Galveston boardinghouse, and had written the story there and left the manuscript behind by accident. My father visited an O. Henry expert at Columbia University in New York, whoauthenticatedthe story as O. Henry's.

My father then set out to sell it. Eventfully, he found himself in Des Moines, meeting with Gardner Cowles, a top editor at the Des Moines Register. Cowles loves the story and bought it on the spot. My father took the money to the girl. It was just enough for her to have the operation she so desperately needed.

My father never told me what the O. Henry story was about. But I doubt that it could have been better than his own story.

    Henri Cartier-Bresson (1908-2004) is one of the most original and influential figures in the history of photography. His photographs helped establish photojournalism as an art form.

    Henri's family was wealthy—his father made a fortune as a textile manufacturer—but Henri later joked that due to his parents' economical ways, it often seemed as though his family was poor.

    Educated in Paris, Henri developed an early love for literature and arts. As a teenager, Henri was against his parents' formal ways of education. In his early adulthood, he fell in love with several appetites, but it was art that remained at the center of his life.

    Henri traveled to Africa in 1931 to hunt antelope and boar. And Africa fueled another interest in him: photography. He then wandered around the world with his camera, using a handheld camera to catch images from fleeting moments of everyday life.

    Not long after World War Ⅱ, Henri traveled east, spending considerable time in India, where he met and photographed Gandhi shortly before he was killed in 1948. Henri's work to document Gandhi's death and its immediate effect on the country became one of Life Magazine's most prized photo essays.

    Henri's approach to photography remained much the same throughout his life. He made clear his dislike of images that had been improved by artificial light, darkroom effects, and even cutting. The naturalist in Henri believed that all editing should be done when the photo is taken. In 1952, his first book, The Decisive Moment, a rich collection of his work spanning two decades, was published. "There is nothing in this world that does not have a decisive moment," he said.

    In 1968, he began to turn away from photography and returned to his passion for drawing and painting.

    Hacking isn't just for computers and smartphones, According to a study published last week in the journal Science, scientists have found a way to hack a plant's genes in order to make it use sunlight more quickly. Someday, the results could increase the amount of food produced around the world.

    Photosynthesis（光合作用）is the word used to describe how plants use sunlight, water, and carbon dioxide to make their own food. Scientists who conducted the new study say this is a very slow process. Plants use less than 1 percent of the energy available to therm. But by hacking a plant's genes, the scientists were able to increase the amount of leaf growth on plants between 14 and 20 percent.

    "Specifically, scientists hacked the plant's protective system. Normally, this system is activated when a plant gets too much sunlight, "said scientist Krishna Niyogi, co-author of the study. When the plant senses the light, it gets rid of extra energy and creates more leaves. When the plant is in shade, the protective system is turned off, but the process is slow.

    Stephen Long is the lead author of the study. He compared a plant's protective system to light-adjusting glasses. When a person wears the glasses outside during the day, the lenses（镜片）darken and lighten depending on how sunny it is. Plants do the same thing, he said. But in plants the adjustment can take anywhere from 10 minutes to an hour. This makes it hard for plants to get the right amount of sunlight needed to create food.

    The new study sped up the process. By changing the plant's genes, the protective system turned on and off more quickly than normal. As a result, leaf growth on the plants scientists used in the study increased. Leaf growth in two plants increased by 20 percent, while leaf growth on a third plant increased by 14 percent. Scientists conducted the study on tobacco plants. But they think the genetic changes will produce the same results in corn and rice.

    I visited Elba last June, joining Mary and John on a bicycling vacation. They made the arrangements for the car, hotel and bicycles. I studied the history of the island, which of course particularly features Napoleon.

    Napoleon (now I know) picked Elba as a place for peace when he was forced to give up the throne (王权) as Emperor of France in 1814. Far from being a prison island, Elba is beautiful with towering mountains, thick forests and sweeping bays and beaches.

    It is also an island filled with treasure. Very early on this island, locals discovered rich deposits of iron. Soon outsiders, too, discovered the iron and 150 other valuable minerals on this little piece of land. Long before Etruscans and other Greeks set foot on it, Dorians had moved in by the tenth century B. C. and were mining the island. The Romans ruled next, obtaining the minerals and building grand houses overlooking the sea. From the twelfth century until the nineteenth, the island was traded back and forth and was passed to France in 1802. Then came Napoleon, the new ruler of Elba.

    I was eager to visit his house in Portoferraio. The Emperor lived with his court and his mother, but his wife, Marie Louise had ensconced herself in the splendid Viennese palace of her father, Emperor of Austria. She lived safely there and showed little interest in visiting her husband in his mini-kingdom. Apparently, Napoleon wasn't troubled much by this. He was too busy riding everywhere on horseback, building roads, modernizing agriculture and, above all, sharpening his tiny army and navy into readiness for his escape.

    In the formal gardens behind the house it seemed to me that I could imagine the exiled (流放的) conqueror's anxious thoughts. He might gaze over where I stood now, toward the lighthouse of the Stella fort, the sandy bay, and across it, the green mountains of the Tuscan coast. Napoleon spent only ten months here before making his victorious return to France and the throne.

Imagine turning on the GPS and seeing an image of your car from above. As the car drives, the map follows along in real time, informing you of any traffic, pedestrians, animals or other things nearby. Routes and names of road appear over the live stream. It's like the map has come to life.

This type of map isn't available yet. But it could be very soon. In 2014, the WorldView-3 satellite was sent into space. Even though it orbits Earth at more than 370 miles (600km) away, it can take images of objects on Earth that are just 10 inches (25cm) across. Looking all the way from outer space, it can make out a smart phone held in your hand. It can tell what types of cars are travelling down a road. But it can't identify your face or read the cars' license plate numbers.

According to some reports, this satellite and other US satellites have the technology to take even sharper images, with a resolution of up to around 4 inches (10cm). But US law forbids making these super-sharp pictures public. But the idea that anybody might be able to spy on the entire Earth in such detail may seem scary. Live, high-detail satellite mapping could be used to keep tabs on anybody at any time, without the person's knowledge. Ray Purdy of University College London told CNN that he couldn't imagine what this could mean for privacy. "Most satellites are commercially owned, so if you have money, you can have that imagery. It means anyone can spy on anyone." he said.

At the same time, live, detailed maps of the Earth's surface could aid humanity in amazing ways. Satellite images can help experts track storms as they form and chart their paths. At high detail, live maps of a disaster area could quickly reveal people in need of rescue as well as the safest routes in or out. Satellites images are already helping the police catch illegal fishing operations. Higher detail may make it possible to catch other criminals in the act. The images could also make it easier for farmers to watch over their crops or for scientists to find minerals. Also, these images play a very important role in monitoring the health of forests and other landscapes.

What do you think? Would you like to see everyone accessing high-detail live maps of the Earth's surface? Please share your idea with us on the website.

How to Apply China Visa (签证)

How to apply China visa is the most concerned question for international tourists who plan to travel to China. Here you will find the useful information about China visa requirements and instructions.

China Visa Requirements

▶The valid (有效的) passport

Original passport valid for at least 6 months with blank visa pages, and a photocopy of data page (with your photo on it)

▶China visa application form and photo

The applicants must fill in a complete visa application form and attach it with a recent-taken colour passport photo.

So what is the requirement of the photo? The photo you submit must be passport-type (bare-head, full face) and standard with the correct dimension and background colour.

▶Effective proof of legal stay or resident status (it applies to those who do not apply for China visa in their countries of citizenship).

Supporting Application Documents

For C-Visa, a letter of guarantee issued by a foreign transport company or an invitation letter issued by a relevant authority from China side shall be provided.

For D-Visa, the original and a photocopy of foreign permanent residence identification form issued by China's Ministry of Public Security shall be provided.

For F-Visa, an invitation letter issued by relevant authorities or individuals from China side shall be provided.

For G-Visa, an onward air (train, bus, ship) ticket with confirmed date and seat to the third country or region shall be provided.

For L-Visa, the tour itinerary (行程) and documents with round trip flight tickets and accommodation reservations, or an invitation letter issued by relevant authorities or individuals from Chinese side shall be provided.

For M-Visa, documents of business activity, trade fair invitation letter or other invitation letter issued by trade partners in China shall be provided.

Further reading: click the link China visa knowledge and types.