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.

    I stand outside waving at the car pulling slowly out of our driveway. I force a smile, hoping it will cover up my tearing eyes, but I know it's not working. I run into the house, slam the door behind me, and begin crying. It's just occurred to me that I can't see my elder sister, Monsura, in the next four months.

    I ask myself why it is that I'm crying when I know she's doing something good for herself. I feel selfish for thinking about it but I'd be lying if I said I was happy for her choosing to study in a university in Boston. When my brother, Shafat, left for college, it was different. I still had one sibling at home to call me the stupidest person on a daily basis.

    I am reminded of the things we did together as kids. In our old two-bed-room apartment, our parents gave in to our constant begging and traded rooms with us for one night. It was like being part of the amusement park, using our parents' big bed as a trampoline (蹦床).It was during the first night that I witnessed a full moon. My sister and I believed my brother. He said that the moon was yellow because it was made from cheese. We made plans to visit the moon so we could melt a part of it and make cheese dip. But now I laugh at myself for being so innocent.

    Sitting in front of my computer, I listen to songs that remind me of my two best friends. I come to terms with the fact that there's no longer anyone here to laugh uncontrollably with me or to turn to at night when I have a nightmare.

    I'm shaken into reality by the sound of my cell phone ringing. Shafat is calling. I pick up and he immediately says “Thank you for such a great childhood.'' Those few words mean the world to me. We three-way call Monsura and spend the next hour reliving memory after memory, and by the end, I forget that I'm alone at home.

Earth Day Photo Contest

    A picture is worth a thousand words! Enter the TFK photo contest and show us: Why is Earth Day important to our planet?

    To enter the contest online, visit timeforkids.com and get details below.

    TIME

    ●The contest begins on January 9, 2017.

    ●The contest ends on April 20, 2017.

    INSTRUCTIONS

    ●An original and previously unpublished photograph that answers the Earth Day question "Why is Earth Day important to our planet?" and that was photographed by the entrant (参赛者) between June 1, 2016, and April 20, 2017.

    ●A brief description describing the picture: what is happening, where the photo was taken, the date the photo was taken and why the entrant chose to enter this image.

    ●Entrant's first name only; entrant's e-mail address; and parent's, teacher's or guardian's e-mail address. Limit one work per person. Sponsors are not responsible for lost, late, or incomplete entries, or entries not received for any reason. Works belong to sponsors, and none will be acknowledged (承认) or returned.

    ●By entering, the entrant ensures that the work is first made and has not been published in any medium or won an award.

    ELIGIBILITY

    Open to the elementary school students at age 8-13 at the time of entry in the USA.

    WINNERS' LIST AND PRIZES

    Judges will select 10 semifinalists (半决赛选手) from whom one grand prize winner and nine finalists will be chosen. The grand prize winner will receive a digital camera—approximate retail (零售) value: $300. The photograph entry of the grand prize winner will be published in the April 22 Earth Day issue of TIME For Kids. The photograph entries of all semifinalists will be published in the gallery of timeforkids.com. Winners will be informed by e-mail, and must respond within five days.

    It is quite reasonable to blame traffic jams, the cost of gas and the great speed of modern life, but manners on the road are becoming horrible. Everybody knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver's seat is another matter altogether.

    Road politeness is not only good manners, but good sense too. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarrelling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and calm so necessary in modern traffic condition. But such behaviors of politeness are by no means enough. Many drivers nowadays don't even seem able to recognize politeness when they see it.

    However, misplaced politeness can also be dangerous. Typical examples are the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may be not able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to. It always amazes me that the highways are not covered with the dead bodies of these grannies (奶奶).

    An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can't even learn to drive. Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take from all road users. It is high time for all of us to take this message to heart.

    People have strange ideas about food. For example, tomato is a kind of very delicious vegetable. It is one of useful plants that can be prepared in many ways. It has rich nutrition(营养) and vitamin in it. But in the 18th century, Americans never ate tomatoes. They grew them in their gardens because tomato plants are so pretty. But they thought the vegetable was poisonous(有毒的). They called tomatoes "poison apples".

    President Thomas Jefferson, however, know that tomatoes were good to eat. He was a learned man. He had been to Paris, where he learned to love the taste of tomatoes. He grew many kinds of tomatoes in his garden. The President taught his cook a way for a cream of tomato soup. This beautiful pink soup was served at the President party. The guests thought the soup tasted really good. They never thought their president would serve his honored guests poison apples. Jefferson never spoke to his honored guests about the fact.

    A university in southwest China's Chongqing City set up a reading room as part of a campaign(活动)that stops students from taking their mobile phones with them in case the device distracts(使分心)them from focusing on their studies.

    Reportedly a student named Hu Xiaopeng taking part in the campaign studied 530 minutes without using his mobile phone. Unlike Hu, another one picked up his mobile phone in less than 20 minutes. "Having seen many students use their mobile phones in the library, a habit that shortens their study time and negatively affects their learning, we decided to open this reading room," said Zhang Shuran, the person responsible for the project at the university.

    Zhang added that students can keep their phones in appointed bags with numbers on them. The bags are placed on a desk near the door of the reading room. "Staff members at the reading room will check the phones when there's a call," said Zhang, adding that they will inform students when their parents or teachers call them, but will not tell students if an unknown person is calling or when there is a text message. Based on the time students hand in their phones when they come to the reading room and the time they get them back when they leave the room, Hu Xiaopeng from College of Animal Science and Technology of the university set a record of the longest time. Hu spent 530 minutes studying without using his phone. Though feeling somewhat surprised, Hu said, "It's bad to keep mobile phone with you when you are reading or studying."

    The campaign has attracted nearly 200 students since it was started a week ago. Some Internet users praised the campaign. One user named Liu Jingchang said, "It's good. I don't bring my phone when going to the library in case I get distracted."