Since the 1970s, scientists have been searching for ways to link the brain with computers. Brain-computer interface (界面) (BCI) technology could help people with disabilities send commands to machines.

    Recently, two researchers, Jose Milan and Michele Tavella from the Federal Polytechnic schooling Lausanne, Switzerland, demonstrated(展示)a small robotic wheelchair directed by a person's thoughts.

    In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand. He could even talk as he watched the vehicle and guided it with his thoughts.

    "Our brain has billions of nerve cells. These send signals through the spinal cord(脊髓)to the muscles to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles," Tavella says.  "Our system allows disabled people to communicate with external world and also to control devices."

The researchers designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.

    Prof. Milan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. "The practical possibilities that BCI technology offers to disabled people can be grouped in two categories: communication, and controlling devices. One example is this wheelchair."

    He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can benefit from. And the other is to guarantee that they can use the technology over long periods of time.

    An absolute description of the threat hanging over the world's mammals,reptiles,amphibians and other life forms has been published by the well-known scientific journal,Nature.A special analysis carried out by the journal indicates that an astonishing 41% of all amphibians on the planet now face extinction while 26% of mammal species and 13% of birds are similarly threatened.

    Many species are already critically endangered and close to extinction,including the Sumatran elephant,Amur leopard and mountain gorilla.But also in danger of vanishing（消失）for the wild,it now appears,are animals that are currently rated as merely being endangered.

    In each case,the finger of blame points directly at human activities.The continuing spread of agriculture is destroying millions of hectares of wild habitats every year,leaving animals without homes,while the introduction of newly-come species,often helped by humans,is also damaging native populations.At the same time,pollution and overfishing are destroying ocean ecosystems.

    "Habitat destruction,pollution or overfishing either kill off wild creatures and plants or leaves them badly weakened," said Derek Tittensor,an ocean ecologist at the World Conservation Monitoring Centre in Cambridge. "The trouble is that in coming decades,the additional threat of worsening climate change will become more and more common and could then kill off these survivors."

    The problem,according to Nature,is worsened because of the huge gaps in scientists knowledge about the planet's biodiversity.Evaluations of the total number of species of animals and plants alive vary from 2 million to 50 million.In addition,evaluations of current rates of species' disappearances vary from 500 to 36,000 a year. "That is the real problem we face," added Tittensor. "The scale of uncertainty is huge."

    In the end,however,the data indicate that the world is heading cruelly towards a mass extinction-which is defined as one involving a loss of 75% of species or more.This could arrive in less than a hundred years or could take a thousand,depending on extinction rates.

    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.

    One of America's best-known artist colonies, the MacDowell Colony, will turn 110 next year. It is a place where artists of all types can sweep away distractions (令人分心的事物) and just create.

    MacDowell's operations are funded by foundations, corporations and individuals. Writers, composers, photographers, filmmakers and sculptors — both famous and unknown —compete for the 32 free studios at the place. Once accepted, an artist can stay for as little as a couple of weeks, or as long as a couple of months.

    When they arrive, artists find a kind of isolation (隔绝) hard to find in our world. There's no phone. No fax. No friends. No family. It's just a cabin in the snowy woods.

    Writer Emily Raboteau lives in New York City. She came to MacDowell to work on a novel. She received a desk, chairs, pencil and paper — and ice grippers. The walk from one isolated, one-room studio to another is icy, so colony residents (居住的人) fasten the ice grippers to the bottom of their shoes.

    Another colony resident, Belfast composer Elaine Agnew, plays a piece called “To a Wild Rose,” written by Edward MacDowell. She says it's so famous that every pianist in the world has played the tune. A hundred years ago, Macdowell owned the land where the colony now sits. He liked its isolation and his ability to get work done there. After his death, his wife, Marion, encouraged other artists to come.

    And for the last century, artists have accepted the invitation, coming to step outside of their daily lives for a short time. Privacy is respected, but cooperation and discussion is common.

    Screenwriter Kit Carson — who wrote Texas Chainsaw Massacre 2 and the film adaptation of Sam Shepherd's play Paris, Texas — has visited MacDowell twice. He says that the interdisciplinary (学科间的) discussion there is valuable.

    “You sit around at dinner, talking, and then somebody runs off and brings you back some stuff and shows it to you,” he says. “That, I didn't realize, was part of the magic here, because people are really open to showing their opinions here.”

    THE WEEK IN READING: THE BEST NEW BOOK RELEASES FOR APRIL, 2017

    I graduated in 1941 and of course got caught in the war. In 1945 I was out, twenty-one years old, a soldier through 35 bombing missions, and at the University of Washington taking creative writing courses, something I'd looked forward to all through the Air Force.

    I'd started writing when I was nine and writing seemed to be the only thing I'd ever be able or want to do. My teacher was a new man named Grant Redford, a very good short story writing teacher and a sad man. He was from Montana and had been connected with the old Rocky Mountain Review. I think it became the Western Review but I'm not sure and I don't bother to look it up. I'm afraid I was never much of a student for Redford. My stories were hopelessly self-indulgent(任性的); on and on about my personal problems, without form, without development, and without even any good writing.

    However, I did write humor in those days and had no trouble getting it published in the campus magazine, though I'd hate to see it now. Mostly my writing was used to get myself attention, to satisfy a terrible personal interest in self-admiration, and it wasn't until I concentrated all my efforts on poems that I was to realize the only real reward of writing, that special way you feel just when you've done something you like. That's far more satisfying than seeing your name in print, good reviews, praise or applause after a reading. And more lasting.