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.

    Generally speaking, college graduation brings both the satisfaction of academic achievement and the expectation of a well-paid job. But for 6,000 graduates at San Jose State this year, there's uncertainty as they enter one of the worst job markets in decades.

    Ryan Stewart has a freshly minted degree in religious studies, but no job prospects. “You look at everybody's parents and neighbors, and they're getting laid off and don't have jobs,” said Stewart. “Then you look at the young people just coming into the workforce.., it's just scary.”

    When those graduates entered college, the future never looked brighter. But in the four years they've been here, the world outside has changed dramatically. “Those were the exciting times, lots of dot-com opportunities, exploding offers, students getting top dollar with lots of benefits,” said Cheryl Allmen-Vinnidge, of the San Jose State Career Centre. “Times have changed. It's a new market. The job situation is grim (严峻的) now.” Cheryl Allmen-Vinnidge ought to know. She runs the San Jose State Career Centre, (it is) sort of a crossroads between college and the real world. Allmen-Vinnidge says students who do find jobs after college have done their homework. “The typical graduate who does have a job offer started working on it two years ago. They've postured themselves well during the summer. They've had several internships (实习) ,” she said. And they've majored in one of the few fields that are still hot—like chemical engineering, accounting or nursing—where average starting salaries have actually increased over last year. Other popular fields (like information systems management, computer science, and political science) have seen big declines in starting salaries.

    Ryan Stewart (he had hoped to become a teacher) may just end up going back to school. “I'd like to teach college some day and that requires more schooling, which would be great in a bad economy,” he said.

    It is true more students are able to receive college education. It is also true that they will have to face fiercer competition in the job market as they graduate. It becomes harder and harder for the current graduates to get a foothold in job markets, but many of them have no choice but to follow the beaten track. To some students a degree may not be ticket to instant wealth. For now, they can only hope its value will increase over time.

A

Fire Prevention Information

    The University of Adelaide employs a full-time staff of fire prevention professionals. They inspect all campus buildings and test and maintain all sprinkler(喷水灭火装置）systems, fire alarms, and fire extinguishers (灭火器). They also provide educational programs or fire safety in the residence hall. Whenever you move to a new area, you should locate the fire alarm pull stations and the two exits nearest your room.

Fire Alarms

    The floors of all campus buildings are equipped with manual(手动的）fire alarm systems which include fire alarm pull stations and pipes. Most are also equipped with automatic fire alarm systems consisting of heat detectors, smoke detectors and sprinklers. For your safety, never tamper with(胡乱摆弄）these systems. False fire alarms are illegal and may lead to imprisonment.

Fire Drills

    A fire drill will be conducted in your residence hall every semester. During a fire drill, please do the following:

    •Take your room key and ID, close and lock the door to your room.

    •Exit immediately from the nearest emergency exit do not use a lift.

    •Meet outside of your residence hall and wait for further instructions.

Fire Extinguishers

    Fire extinguishers are located on each floor and in each apartment. Use a fire extinguisher only if you have been trained to do so. Irresponsible use of a fire extinguisher can create a dangerous situation for other residents and could result in damage to personal property. Misuse of a fire extinguisher will result in fines.

Smoke Detector

    A smoke detector is on the ceiling in your room. Some buildings also have heat detectors on the ceilings. Do the following to ensure the safe operation of your smoke detector:

    •If your smoke detector is working properly, the red light should be on. If the red light is not blinking（闪动），contact residence hall staff immediately.

    •Do not cover or block your smoke detector in any way.

    •If a smoke detector sets off an alarm and there is no fire or smoke, inform your hall staff.

    The kids in this village wear dirty, ragged clothes. They sleep beside cows and sheep in huts made of sticks and mud. They have no school. Yet they all can chant the English alphabet, and some can make words.

    The key to their success: 20 tablet computers(平板电脑) dropped off in their Ethiopian village in February by a U.S. group called One Laptop Per Child.

    The goal is to find out whether kids using today's new technology can teach themselves to read in places where no schools or teachers exist. The Massachusetts Institute of Technology researchers analyzing the project data say they're already amazed. “What I think has already happened is that the kids have already learned more than they would have in one year of kindergarten,” said Matt Keller, who runs the Ethiopia program.

    The fastest learner—and the first to turn on one of the tablets—is 8-year-old Kelbesa Negusse. The device's camera was disabled to save memory, yet within weeks Kelbesa had figured out its workings and made the camera work. He called himself a lion, a marker of accompli shment in Ethiopia.

    With his tablet, Kelbasa rearranged the letters HSROE into one of the many English animal names he knows. Then he spelled words on his own. “Seven months ago he didn't know any English. That's unbelievable,” said Keller.

    The project aims to get kids to a stage called “deep reading,” where they can read to learn. It won't be in Amharic, Ethiopia's first language, but in English, which is widely seen as the ticket to higher paying jobs.

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    So what is rewilding?

    Imagine our natural homes growing instead of shrinking. Imagine species (物种) diversifying instead of declining. That's rewilding. Rewilding is ecological restoration. Rewilding offers hope for wildlife, humans and the planet.

    Why is rewilding important and necessary?

    Our natural ecology is broken. The places where you would expect wildlife to exist have been reduced to wet deserts. The seabed has been destroyed and there have been no living creatures any more.

    Our wildlife is disappearing. Many wonderful species have declined over the past century. We've lost more of our large animals than any European country.

    We need keystone species. These vital species, including top predators (食肉动物), drive ecological processes. Their loss has worsened our living systems.

    Nature looks after us. Good natural ecology can provide us with clean air and water, prevent flooding and store carbon. Rewilding can leave the world in a better state than it is today.

    What are challenges?

    As a long-term project, our "rewilding britain" has its challenges. Many people are not interested, because we have got used to the lack of native forests. Many farmers oppose the idea. They thought it a crazy idea to bring back predators because they would start killing farm animals. It takes time to educate them. Above all, we need money! So we need your help!

    Make a donation.

    Help us bring back living systems and restore wild nature!

With your help we can…

    Open up new chances for rewilding and push for change.

    Develop tools to educate, influence and spread the word.

    Thanks for your support.

More than 100 scientists traveled to faraway places to collect wild crop seeds in an effort to help battle climate change. The scientists have been likened to the hero of the Indiana Jones movies. Like him, they had to face blood-sucking creatures and fierce tigers. Some-times, they had to use elephants for transportation because they couldn't find any other means of transportation.

A report on the project was published last week. It described the results of a six-year search to collect thousands of wild seeds. The seeds could be important in feeding a growing human population at a time when rising temperatures are affecting crop production in some areas.

The scientists traveled on foot, by four-wheeled vehicles, boat and riding horses and they even rode elephants to reach faraway areas. They collected 4,644 seed samples of 371 wild relatives of 28 crops. Many of those wild relatives are said to be endangered.

The Crop Trust, a nonprofit organization that works to save different kinds of crops, was directing the project. The group was working in partnership with Britain's Royal Botanic Gardens and Millennium Seed Bank. Additional financial support came from Norway. The project is believed to be the largest organized international effort yet to collect and protect crops' wild relatives.

Some relatives of widely grown crops have developed so they can survive usual and severe conditions such as low rainfall, flooding, extreme temperatures and poor soils. Scientists say the wild crops offer a largely unused source of diversity for protecting crops against climate change.

Some crops are threatened because of destruction of forests, conflict and expanded cities. Experts say losing this diversity could endanger food security around the world. A United Nations report says that food supplies are under severe threat. The report notes that the number of animal and plant species are quickly disappearing as the world deals with how to feed a rising population.