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.

    “A good book might clarify something you knew little about, transform your world view, or move you in ways you didn't think possible. The Soul of an Octopus(章鱼)delivers on all three, ”the magazine New Scientist commented.

    After writing about birds, pigs and tigers, US naturalist Sy Montgomery decided to choose these many-footed animals as the subject of her latest book, The Soul of an Octopus: a surprising exploration into the wonder of consciousness.

    “Here is animal with poisonous liquid like a snake，a beak(喙)like a parrot，and ink like an old-fashioned pen. It can weigh as much as a man and extend as long as a car, yet it can pour its baggy; boneless body through an opening the size of all orange. It can change color and shape. It has a tongue covered with teeth. It can taste with its skin.” Montgomery explained to the National Geographic on why octopuses inspired her.

    What Montgomery is able to show in The Soul of an Octopus is that octopuses are creatures who exhibit personality, intelligence and emotion, despite having nervous systems completely different from our own. She uses different experiments to show that they possess consciousness as well as individual personalities. For example, based on her research, she finds out that Octavia, an octopus caught in the wild, is friendly and good at multi-tasking. And Kali, another octopus，who has been living at the New England Aquarium, is playful and loves exploring.

    Montgomery is a good storyteller. Through her study of, and communication with, these extraordinary creatures she shares what she learns from both science and her experiences. Her skillful writing presents facts together with personal description, which makes the book very informative but easy to read.

Distance runners often worry about “hitting the wall” during training or races—that terrible moment when negative thoughts become so overpowering that they make it difficult to continue.

Hitting the wall typically happens around 20 miles in a marathon, when the body's supplies become exhausted. At this point, many runners feel exhausted and discouraged, slow their pace, have trouble focusing and want to quit or walk.

“Generalized tiredness, unintentionally slowing their pace, the desire to walk, and shifting focus to just surviving the marathon appear to be particularly common characteristics of it,” said Dr. Alistair McCormick, an exercise psychologist in England who co-authored a new study. “A marathon becomes a real mental battle when runners ‘hit the wall.'”

    Psychological blocks are an extremely common experience for recreational endurance (耐力) athletes, according to the study. To learn how they affect people, sports psychologists asked 30 recreational runners and cyclers about the psychological demands of training, preparing for and participating in competitions.

     “Recreational runners and cyclists found it stressful trying to find the time to train, McCormick said. “What was also interesting was the number of potential banana skins they met with before and during competition-disasters that could cause the athletes to lose their focus and their motivation to keep persevering.”

    These roadblocks included difficult environmental conditions and equipment failure, problems with nutrition or making a mistake, the study reported. The athletes in the study said they fell these obstacles (障碍) affected their motivation and concentration, negatively affecting their overall performance.

According to the study, 43 percent of marathoners are likely to hit the wall during a race. Finding ways to move past those kinds of experiences, then, could have major benefits for an athlete's performance and well-being.

    Have you ever noticed what happens to an idea once you express it? Just talking about it or writing it down causes you to make it clear in your own mind. How can you use this to increase your brain power? Start writing.

    By putting thoughts into words, you are telling yourself the logic (逻辑) behind what you think, feel, or only partly understand. Often, explaining a thought is the process of understanding. In other words, you increase your brain power by exercising your “explain power.”

    Try this experiment. Explain how you'll increase your brain power, even if you have no idea right now. Just start with anything, and create an explanation. For example, start with “I'll learn chess,” or “I'll read an article on the mind every week.” Explain how that will help. You'll be surprised how often this becomes a workable plan, and if you actually do this, you'll have a better understanding of your brain from now.

    Another benefit of writing is that it helps you remember. Many, if not most, highly productive people are always taking notes. You can try keeping it all in your head, but if you keep a journal of your ideas the next time you're working on a big project, you'll probably have more success.

    Want to understand a topic? Write a book about it. That's an extreme example, but if you are learning something new, write a letter to a friend about it, and you will understand it better. Want to invent something? Write an explanation of the problem, why you want to solve it, and why it is worth solving, and you're half-way there.

    Writers don't always write because they clearly understand something beforehand. Often, they write about something because they want to understand it. You can do the same. Writing will help bring you to an understanding. Give it a try.

    You've heard of the fat suit and the pregnancy suit; now meet AGNES—the old person suit.

    AGNES stands for “Age Gain Now Empathy(换位体验)System” and was designed by researchers at MIT's AgeLab to let you know what it feels like—physically—to be 75 years old. “The business of old age demands new tools,” said Joseph Coughlin, director of the AgeLab. “While focus groups and observations and surveys can help you understand what the older consumer needs and wants, young marketers never get that Ah ha! moment of having difficulty opening a jar, or getting in and out of a car. That's what AGNES provides. ”

    Coughlin and his team carefully adjusted the suit to make the wearer just as uncomfortable as an old person who has spent a lifetime eating poorly and not doing much exercise. Special shoes provide a feeling of imbalance, while braces on the knees and elbows limit joint mobility. Gloves give the feeling of decreased strength and mobility in the hands and wrists, and earplugs make it difficult to hear high—pitched sounds and soft tones. A helmet with straps(带)attached to it presses the spine(脊柱), and more straps attached to the shoes decrease hamstring flexibility, and shortens the wearer's step.

    AGNES has been used most recently by a group of students working on a design of an updated walker. By wearing the suit they could see for themselves what design and materials would make the most sense for a physically limited older person. Coughlin said the suit has also been used by clothing companies, car companies and retail goods companies to help them understand the limitations of an older consumer.

    “AGNES is not the destiny of everybody,” he said. “She is a badly behaved lady who didn't eat and exercise very well. A secondary benefit we've found with AGNES is that it has become a powerful tool to get younger people to invest in their long-term health. ”

    It was the final climb on his search to reach the highest top on all seven continents. When Christopher Kulish finally reached Mount Everest's 29,035-foot peak, he joined an elite group known as the "Seven Summits Club"(七峰俱乐部). But the 62-year-old Colorado attorney died suddenly Monday after returning to the first camp below the mountain's summit. He's the second American to die in the past week after reaching Everest's highest point. His family believes the cause was a heart attack, according to theDenver Post. "He saw his last sunrise from the highest peak on Earth," his brother, Mark Kulish, said in a statement to the Denver Post. "We are heartbroken at this news."

    Last week, 55-year-old Donald Lynn Cash of Utah collapsed and died just after reaching the Everest peak. He too had reached the highest point on all seven continents. Including Christopher and Cash, at least 11 people have died on Mount Everest this year.

    The deaths come among reports of overcrowding on the popular mountain. The Nepali government granted a total of 381 permits to climb Everest this year, a number that doesn't include guides who are on the mountain as well. For some climbers, that traffic has meant longer wait times — some told the Himalayan Times the wait has been over two hours between the last camp and the peak. Mountaineer Vanessa O'Brien, who has also climbed the seven summits, said when there's a crowd, being a more experienced climber won't help you. "It doesn't matter if you're the best racecar driver in the world. If you're stuck in traffic, you're stuck in traffic," she said in an interview.

    And when a climber is stuck in that traffic, "their body is starting to deteriorate(恶化)." O'Brien, who set a record as the fastest woman to reach the highest peak on every continent, also said the descent(下降) is often harder than the climb.

    Climbing expert Alan Arnette said there's no simple explanation for the string of deaths. He said weather that has led to a shorter climbing season is one factor causing overcrowding. He also said the cost to climb Mount Everest has decreased, which means more people are making the journey. He urged the governments in charge of granting(同意)permits to limit how many people can be on the mountain at once.

    Still, Christopher was no beginner. His family said he'd been mountain climbing for five decades. He arrived at the base camp nearly two months before his climb so he could give himself time to adapt to the conditions. When he made his journey, his family said he was climbing with a small group in almost ideal conditions after some of the overcrowding had cleared.

    His brother described being a lawyer as a "day job" for Christopher. Climbing was his love. "He was an inveterate climber of peaks in Colorado, the West and the world over," Mark Kulish said. "He passed away doing what he loved."