Astronauts on shorter shuttle missions (使命) often work very long days. Tasks are scheduled so tightly that break times are often used to finish the tightly that break times are often used to finish the day's work. This type of scheduled is far too demanding for long missions on the International Space Station (ISS). ISS crewmembers usually live in space for at least a quarter of a year. They work five days on and two days off to mimic the normal way they do things on Earth as much as possible. Weekends give the crew valuable time to rest and do a few hours of housework. They can communicate with family and friends by email, internet phone and through private video conferences.

    While astronauts cannot go to a baseball game or a movie in orbit, there are many familiar activities that they can still enjoy. Before a mission, the family and friends of each ISS crewmember put together a collection of family photos, messages, videos and reading material for the astronauts to look at when they will be floating 370 kilometers above the Earth.

    During their mission, the crew also receives care packages with CDs, books, magazines, photos and letters. And as from early 2010, the internet became available on the ISS, giving astronauts the chance to do some “web surfing(冲浪)”in their personal time. Besides relaxing with these more common entertainments, astronauts can simply enjoy the experience of living in space.

    Many astronauts say that one of the most relaxing things to do in space is to look out the window and stare at the universe and the Earth. Both the shuttle and the ISS circle the planet several times each day, and every moment offers a new view of the Earth's vast land mass and oceans.

    You may know about “junk food” like French fries. But do you know about “junk sleep”?

    Recently, a British survey found that electronic(电子的) products in teenagers bedrooms are affecting(影响)their sleep.

    The survey was done among 1,000 British kids from 12 to 16. It found that 30 percent of them got just 4 to 7 hours sleep every day. But doctors say they need 8 to 9 hours.

    Almost a quarter of the kids said they fell asleep more than once a week while watching TV, listening to music or using other electronic products.

    “This is very worrying.” said Dr Chris Idzikowski, a British expert, “We call it 'junk sleep', it means you don't get enough sleep and the quality of the sleep is bad, too. If you don't get good rest, you don't perform well in school the next day.”

    The survey found that 40 percent of the kids felt tired each day, with girls between 13 and 16 feeling the worst. Nearly all the teenagers have a phone, Mp4 or TV in their bedroom. And many of them have all three.

    I'm a reporter. Last month I was in Stockholm, Sweden. Now I'm in Frankfurt, Germany. Next month, who knows?

    You certainly won't believe that I can call you from my laptop, which is what I'm often doing these days using something called Skype.

    Skype lets me call any phone number anywhere in the world for about 2 cents a minute, a little more to some places, such as the Middle East and Asia. My computer does the dialing, and the processing of incoming and outgoing voices. All you need is a broadband connection (宽带接头). With the basic version of Skype, all anyone needs to make or receive a call is to install the program on his or her computer (and that includes personal digital assistants). All calls from PC to PC are free.

    You don't even need a pair of headphones, though headphones can be a good idea if you wish to be discreet. I use my laptop's built-in microphone.

    The paid service for calling regular telephones is called SkypeOut. The quality is completely clear, provided that there's not too much traffic on the Internet. If there's an echo, hang up and try again, and it usually gets better. There is one warning: on some computers, especially those running older versions of Windows, it doesn't always work, or can sound like a confusing conversation. You can't hear a thing.

    Skype was invented chiefly by a Swede named Niklas Zennstrom along with a group of programmers in Estonia.

    Blogs(博客) have become an important part of life. Millions of people have blogs. Perhaps you would like to have one; you would like to improve your blog; perhaps you would like to make your blog as a means of earning money or attracting more people. Whatever your aim is, this course shows you how to become better bloggers. You will learn how to find the right tone for your blog, set it up and keep it, write something that are effective and worth reading, and attract people from all over the world to your blog. While it's simple to start a blog, it takes energy and skill to do it really well, as is true of any kind of writing.

    Among the topics covered: introduction to the blog, the benefits of blogging, focusing on your blog concept, how to set up and keep a page, tips for effective blog writing and drawing visitors to your blog.

    Course offered

    How to blog

    In this four-week course, a blogging expert will guide you through the process of designing, setting up, writing, and improving a blog. Each student will talk with the expert on blog, then set up a "live" blog and introduce it to the rest of the class for suggestions. Students will also have chances to ask the expert questions.

    Online classes

Tuition(学费): $ 125.      Registration(注册): $ 25.

Each class is strictly limited to 25 students aged 18 and up.

No one can believe that the over 6, 300-kilometre Great Wall might disappear some day. Believe it or not, the Great Wall is being destroyed by people. Less than 20 percent of the Great Wall built in the Ming Dynasty is still perfect, and about 80 percent is in danger. 

The Great Wall can be called "great" mostly because of its amazing length. If we do nothing to save the Great Wall, it will become wasteland rather than a historic site. The Great Wall is actually a series of walls built and rebuilt by different dynasties over the past 2, 000 years. It began in the Qin Dynasty, and lasted into the Ming Dynasty. The parts built before the Ming Dynasty have nearly disappeared. People are familiar with sections such as Badaling in Beijing and Jiayuguan Pass in Gansu, because they have been open to tourists for many years. But those sections far away from the public eyes have been almost forgotten. 

Few local people knew the 3-metre-high walls made of earth and stones beside them are part of the Great Wall. The lack of knowledge is considered as one of the main reasons behind humans. 

The bricks on the Great Wall are carried off by countryside people to build their houses. Rubbish is spread over the battlements. Those who destroyed and are destroying the Great Wall know its name, but don't know its cultural meaning. The local farmers not only carried off the body of the Great Wall but dug out the entire base. 

It is necessary to protect the Great Wall. First of all, the officials should be aware of the importance of the Great Wall. Young Chinese should know more about the nation's great civilisation and learn to love it. 

At just 18 years old, Khalifa Aminu from Kano, Nigeria, has proved himself as an amazing inventor, with his sensory glasses designed to help the visually impaired (视障人士).

The glasses are fitted with infrared sensors (红外传感器) that can "see" obstacles in the user's path, warning them about possible dangers without the need for traditional walking sticks or guide dogs. In their current form, the glasses let out a beeping sound when an object is nearby, helping users move past it safely. Aminu is now working on making the glasses even more effective, particularly in low-light and nighttime conditions.

Aminu's journey into the world of invention began in childhood. He started small, building a canoe (独木舟) as his first project, and quickly realized that his creations could be used to solve real-world problems in his community. This love for invention has led him to create various innovations such as a radio station, a bomb detector and an automatic water sprayer for farmers.

As for how Aminu came up with the idea of his latest creation, Aminu explained, "I grew up in an area where there are visually impaired people, and I understand what they're going through. This is why I began the process for a technology-based solution for them."

The glasses have received positive feedback from testing. In a recent trial, a blind man was highly impressed by their effectiveness. "He suggested several improvements, like a wireless switch, smaller parts, and lenses for better usability," Aminu explained. "These suggestions will be carried out in future versions, but the challenge remains the lack of materials and resources for further development."

Luckily, in June, Aminu's invention caught the attention of Nigeria's National Commission for Persons with Disabilities, suggesting a bright future for him in further innovation and mass production. "My ultimate dream is to build a global company that continues to develop innovative technological solutions not only for Nigeria but for the world," said Aminu.