The town of Green Bank, West Virginia, is the site of the largest radio telescope in the world, so Internet connections and anything else that can create electromagnetic(电磁的) waves, such as smart phones and microwave ovens, are banned.

    Green Bank is frozen in time, somewhere in the 1950s, because there's a 33,000-square-kilometer zone of silence due to the telescope. Cell phone towers are forbidden.

    The closer you get to the telescope, the greater the restrictions. There's a 16-kilometer radius(半径) around the observatory where radio-controlled items, even toys, cannot be used.

    Telescope employees even work in a special room that blocks electromagnetic waves from leaving it. “Here imagine a submarine(潜艇), water cannot get inside, and so this room is an electric submarine. No electromagnetic waves can get into this room, just as you can't go beyond it,” Michael Holstein, an observatory officer, said.

    The size of a football field, the telescope is so sensitive that it could pick up signals sent from an alien world. And scientists can't wait for that to happen.

    “All the signals that we now receive with the help of telescopes are signals that come from cosmic objects — stars, galaxies. We have not yet received anything from intelligent civilizations,” scientist Richard Lynch said.

    Local people respect the work of the scientists. “Yes, we are different. Many would say that we live the old-fashioned way, in the past. But for us, it's just the way of life that we have always lived,” Sherry said.

    “When we want to meet friends, we just call each other on a wire phone. And instead of sitting in front of your screen, we talk, we go fishing, to the mountains,” resident Sherry said.

    For the latest news, residents read the weekly local newspaper. When she's looking for a phone number, Sherry reaches for the phone book.

    And instead of Facebook, Sherry enjoys daily conversations with her customers. In this town, everyone knows each other and communication is face to face.

    Please Choose Cloud Services

    May be unsure, or you do not know where to begin. Trying every Cloud service would take a lot of time and work. But, the website Reviews.com might help.

    One valuable feature is the protection of digital files, including photos, videos, documents, music and more. If the worst happens and your computer crashes, or gets lost or damaged, your files can still found in the Cloud.

    Cloud services let you access your files from almost anywhere. No need to worry about a file stored on your computer when you are away from your desk. If you have an Internet connection, you can open your files from any computer, or from a phone, when they are stored using a Cloud service.

    Using a Cloud service makes sharing files easier. If you send documents to a group using emails, you may then wonder which version everyone is working with. When sharing files using a Cloud service, everyone will see the same document and the latest version.

    The first thing to consider is the amount of storage space you need. Check how much space you are currently using on your computer and mobile devices. If your computer or phone is filled with photos and you have little free space, you may want to move your photos to the Cloud. Some Cloud services are free. But, if you need a lot of space, you will probably need one that costs money.

    Even if everyone you have ever met is a Windows user, you still probably want a Cloud service that works with many platforms. You might become friends with an Android user or start a job with a company that computers on Apple!

    Stefano Boeri, the Italian architect, famous for his Bosco Verticale, a group of tree-covered skyscrapers in Milan, introduced his new plans to pioneer a similar project in the Chinese city of Nanjing.

    The Chinese version of Boeri's Bosco Verticale, or vertical forest, will be his first project in Asia. The project will consist of two neighboring towers that will be coated with 23 different species of trees and more than 2,500 kinds of bushes hanging down the sides of the buildings. The structures will be built with the ability to house offices and will feature a 247-room luxury hotel, as well as a museum and even a green architecture school. The towers are currently under construction and are set for completion within the next year.

    But two buildings aren't enough for the ambitious Boeri as he now has even bolder plans for China to create “forest cities” in a country that has become known as an urban center choking on poisonous gases and dust.

    In an interview about his plans to “greenify” the city and country Boeri said, “We have been asked to design an entire city where you don't only have one tall building, but you have 100 or 200 buildings of different sizes, all with trees and plants on the sides.” Boeri continued, “We are working very seriously on designing all the different buildings. I think they will start to build at the end of this year. By 2020 we could imagine having the first forest city in China.”

    Although these towers will lend a huge hand in decreasing air pollution in China's eastern city, Boeri has said, it will take more than a pair of tree-covered skyscrapers to really solve China's pollution crisis. This is why the Italian architect hopes to repeat his design in other parts of the country, as well as in other places around the world.

    If you're looking to fully experience Africa's breathtaking scenery, and have an eye for adventure, then there's only one place to be. Here, inside Africa picks four of the best hikes from across the continent.

    ⒈Kilimanjaro

    Make it to the top of Tanzania's 5,895-meter Kilimanjaro, and you'll be standing at Africa's highest point. The mountain is Africa's most-visited hiking destination, attracting tens of thousands of tourists and adventures every year.

    You don't have to a technical climber to climb Mount Kilimanjaro; you just need not be pretty physically fit. There are six routes to choose from difficulty, scenery and success. No special equipment

    ⒉Atlas mountains

    The High Atlas is an impressive mountainous range in central Morocco that hosts North Africa's highest peak. Mount Toubkal, at 4,165 meters. There's a variety of routes to follow during your climb but inexperienced climbers should note that the hike through the mountain's challenging zones is quite demanding.

    ⒊Mount Kenya

    A long-extinct volcano. Mount Kenya is Africa's second-highest peak, at 5,199 meters.

    Lying just south of the equator, the mountain's deep valleys and diverse wildlife will guarantee you wonderful scenery and a fantastic hiking experience.

    The climb, however, to the mountain's steep ice-capped peaks is quite challenging, making it the most technical, probably, in that East African area.

    ⒋Mount Meru

    Mount Meru may forever exist in the shadow of its neighbor, Kilimanjaro, but Tanzania's second-highest mountain (4,565 meters) has its own devotees.

    It's less known, but Mount Meru is for the true enthusiast who wants to experience what very few people actually do.

    Mount Meru is often used by mountaineers to accustom themselves before trying to conquer Kilimanjaro, or by those wanting a hike with the local Massai.

    Everybody hates rats (big mice). But in the earthquake capitals of the world — Japan, Los Angeles, Turkey — rats will soon be man's best friends.

    What happens after an earthquake? We send in rescue dogs. Why? Because they can smell people. Dogs save lives. They help rescuers to find living people. But dogs are big and they can't get into small spaces. So now a new research project is using a smaller animal to save lives: the rat.

    How does it work? First, the rat is trained to smell people. When this happens, the rat's brain gives a signal (信号). This is sent to a small radio on its back, and then the rescuers follow the radio signals. When the rat's brain activity jumps, the rescuers know that someone is alive. The rat has smelled that person.

    Although there are already robots which can do this job, rats are better. Christian Linster at Cornell University, New York, says, "Robots' noses don't work well when there are other smells around. Rats are good at that." Rats can also see in the dark. They are cheaper and quicker to train than dogs, and unlike robots, they don't need electricity!

    The "rat project" is not finished, but Julie Ryan of International Rescue Organization in Scotland says, "It would be wonderful. A rat could get into spaces we couldn't get to, and a rat would get out if it wasn't safe." Perhaps for the first time in history, people will be happy to see a rat in a building (but only after an earthquake, of course).

It was a regular school day, and the air was filled with the usual sounds of chatter and laughter as students prepared for their lessons. Little did I know that this day would soon take a dramatic turn, making it a/an 1 day.

As the bell rang, 2 the beginning of our English class, we entered the classroom, completely 3 of the coming danger. The teacher began the lesson, and we were really 4 our literature lesson when, out of nowhere, a loud fire alarm interrupted everything.

Panic spread as we understood how 5 it was. Smoke filled the hallway, and a sharp burning smell hung in the air. The neat classroom turned into a mess as everyone 6 to the door, trying to get away from the coming danger.

In all the chaos, I noticed my 7 Sarah looking obviously scared by her desk. I quickly 8 she needed help. Without hesitation, I rushed over, took her shaky hand, and told everyone to stay calm. We went through the chickening smoke together, and each 9 felt like a really long time.

As we reached the door, it felt hotter, and we knew we had to hurry. With hearts 10 , we hurried into the playground where teachers and students were making sure everyone stayed safe.

Outside, we took a moment to catch our breath, 11 by the loud sounds of approaching fire trucks. Seeing parts of the building on fire, a sense of 12 washed over us, knowing that we had made it out unharmed.

After everything happened, I couldn't help but reflect on the events of that day. 13 all this taught me it's important to stay calm when things get 14 and how helping others during hard times matters. It was a day when ordinary students became unlikely heroes, bound together by the shared 15 to overcome the unexpected challenges.