This year's flu season is pretty scary. To try to minimize the effects, public officials are still urging anyone who hasn't yet gotten their flu shot to get one as soon as possible. However, even if every single person got a shot in the arm, the vaccine(疫 苗)—with its excellent 36 percent effectiveness—would not prevent everyone from getting infected with the annoying virus. Knowledge is power, so here's what goes on in your body when you come down with the flu.

    The influenza virus primarily attacks your nose, throat, and the tubes that lead to your lungs. But the flu is so much more than that. Your muscles ache, your head hurts, and your appetite goes down, among other things. To our surprise, almost all of these symptoms have less to do with the virus itself than with your immune(免疫的)response to them. Unfortunately, the very defense you have in place to get rid of the flu is the reason you feel so painful when you recover.

    The virus usually enters through your mouth, typically by way of your hands. But it takes a few days for symptoms to set in. While this process might cause some harm to your nose and throat, it's nothing major, and nothing like the symptoms that typically accompany a bad or even mild case of the flu.

    The real fun starts when your immune system begins to fight. Your immune system comes in two parts: the innate system and the adaptive. The innate immune system is essentially an all-purpose tool. As soon as your body senses the presence of any injury or invader, the innate immune system launches into action by producing tiny proteins called cytokines and chemokines. The cytokines reproduce almost immediately and start to attack the virus. This increase in immune cells creates a serious inflammation(炎症) throughout the body. But the worst is still to come.

    Meanwhile, the chemokines work with the adaptive immune system to help create T cells. These cells are a special type of white blood cell that works in a much more specific way: They find the influenza virus, identify what's special about it, and create something unique on their surface that finds and destroys similar invaders.

    Nola (August 21, 1974 -November 22, 2015) was a northern white rhino who lived at the San Diego Zoo Safari Park near Escondido, California. At her death, she was one of only four remaining northern white rhinos in the world. The other three lived in Kenya. World Rhino Day, held on September 2, is to raise awareness(意识) of the less than 30,000 other rhinos left on Earth.

    “Rhinos need our help today, not tomorrow,” Nola's lead keeper Jane Kennedy said. “Last year we lost over 1,200 rhinos just in South Africa. If we continue to lose more than 1,000 rhinos a year, in 10 to 20 years all the rhinos on the planet will be gone.”

    “Unfortunately, most animals are in danger of dying out because of humans,” Kennedy says.“ Humans have either poached animals, or because there are over seven billion of us, we've taken up too much of the world's resources”. Poachers illegally hunt rhinos for their horns. They sell the horns for thousands of dollars per pound, to be used for art, jewelry, and decorations. Experts believe that one rhino is poached every eight hours.

    In 1975, the San Diego Zoo Institute for Conservation Research started the Frozen Zoo, a program through which researchers have collected cell (细胞) samples from more than 8,000 different types of animals, including the northern white rhino. Scientists hope that by studying the rhino cells, they will get greater understanding of it, and will find ways to increase its numbers.

    Jane Kennedy describes World Rhino Day as “a celebration of rhinos along with an awareness campaign for everybody across the world to know that rhinos need our help.”At the San Diego Zoo, children and adults are welcome to visit and speak with zookeepers to learn about rhinos. But you don't have to live in San Diego to celebrate World Rhino Day. It is observed around the world, with zoos and wildlife parks holding special events and programs to teach people about rhinos, and enable them to see the animals up close. For more information, go to www.worldrhinoday.org.

    A British-designed electronic newspaper which is made of plastic and no larger than a table mat(垫子) is to enter the market next year. The new newspaper was conceived(想出) by Cambridge University scientists. They came up with the idea of replacing silicon chips (硅片) with plastic ones. It is being developed by Plastic Logic, a company based in Dresden, Germany.

    "It looks just like a table mat, and is as light as a magazine. But you can download hundreds of newspapers at the touch of a button, and read them quite safely," the BBC reported on its website.

    The plastic paper is produced in a safe "clean room" at the Plastic Logic factory, which opened last month as the world's first plastic-electronics factory. Every part of the product, from the screen to the electronics, is made of plastic. And it is described by engineer Dean Baker as "top quality". Baker says the plastic newspaper could help solve the problem of waste material associated with traditional newspapers.

    "There's a huge amount of waste. We have paper distributed（分发）all over the country each day and then thrown into the bin. This doesn't need to happen any more. All of the copies could be made electronically and stored on a single ereader with the appearance of paper." he says.

    People can expect to see the plastic newspaper next year, the BBC says.

Riding School:

    You can start horse-riding at any age. Choose private or group lessons any weekday. There are 10 kilometers of tracks and paths for leisurely rides across farmland and open country. You will need a riding hat.

    Opening Hours: Monday through Friday: 9:00 a.m.-8:30 p.m. (3:30 p.m. on Saturdays)

    Phone: (412)396-6754 Fax:(412)396-6752

Sailing Club:

   Our Young Sailor's Course leads to the Stage 1 Sailing qualification. You will learn how to sail safely and the course also covers sailing theory and first aid. Have fun with other course members afterwards in the clubroom. There are 10 weekly two-hour lessons.

    Opening Hours: Tuesdays: 6:00 p.m.-8:00 p.m.

    Phone:(412)396-6644    Fax:(412)396-6644

Diving Centre:

    Our experienced instructors offer one-month courses in deep-sea diving for beginners. There are two evening lessons a week, in which you learn to breathe underwater and use the equipment safely. You only need swimming costume and a towel. Reduced rates for couples.

    Opening Hours: Monday and Friday: 6:30 p.m.-8:30 p.m.

    Phone:(412)396-6312    Fax:(412)396-6706

Medical Center:

    The staff of the Medical Center aim to provide convenient and comprehensive medical care to students and staff of the university. The center is well equipped and the staff here are trained to deal with a broad range of medical problems. Both female and male doctors as well as nursing staff are available for consultation. Also, all kinds of medicines are sold here and are cheaper for students than other drugstores.

    Opening Hours: 24 hours from Monday to Sunday

    Phone:(412)396-6649    Fax:(412)396-6648

Water sports Club:

    We use a two-kilometer length of river for speedboat racing, and water-skiing. A beginners' course consists of ten 20-minute lessons. You will learn to handle boats safely and confidently, but must be able to swim. The club is in a convenient central position and is open daily from 9 a.m. to 4 p.m., with lessons all through the day.

    Opening Hours: Monday through Friday: 9:00 a.m.-4:00 p.m.

    Phone:(412)396-6899    Fax:(412)396-6890

    Visual language is a form of communication that uses visual elements (元素) as opposed to formal written language to convey meaning or an idea, Graphicacy, the ability to communicate visually, is considered as important as literacy and numeracy, the abilities to read and count. Some people are visual thinkers, using that part of the brain that is emotional and creative to process and give meaning to information. Visual communication can find expression in paintings, drawings, symbols, or simply lines and shapes arranged for a specific effect.

    Art is an example of visual language. A painting or sculpture can convey ideas or arouse specific kinds of emotional responses. It may also express ideas about historical events, abstract concepts, or simply be about the way certain shapes or forms "work" together or create a certain effect on the mind. Some researchers believe that different parts of the brain respond in unique ways to colors and shapes.

Pictograms (象形文字) and ideograms (表意文字) are types of visual language. Pictograms are pictures that are similar to what they represent. They are still used today to communicate information. Many people around the world are familiar with the pictograms indicating such things as airports, public facilities, and non-smoking areas indicated by a cigarette in a circle with a line across it. Ideograms are pictures that represent ideas and can often be understood without the aid of written language. Some scholars track modern alphabets to pictures Letters are actually ancient pictures, and words are a series of pictures. Modern alphabet letters are not only phonetic (语音的) symbols but are based on ancient religious images and symbols.

    Musivisual communication is also a part of visual language. The term refers to music created specifically to improve the visual experience of film. It corresponds to the images being seen on the screen, and the music may arouse a sense of terror, fear, or other emotions. Most movie goers understand the language of musical clues showing that something dramatic or important is about to happen.

Nick Torrance, a junior in high school, suffers from muscular dystrophy, and attends school in a specialized wheelchair. The muscle disease prevents him from accomplishing many everyday tasks, such as carrying his books and putting things away in his locker. So he had a fellow student assigned to help him. But Amy Smith, the school's occupational therapist, thought that being able to do something simple like opening his locker on his own would be empowering.

Amy initially thought they would be able to buy a device to help. But searching online turned up nothing that could meet their needs—everything needed a keycode or some other physical action, things her disabled student couldn't do. After the outside search for a method came up short, she looked within the school itself for an answer. Amy turned to the school's robotics instructor.

The instructor, in turn, suggested that two of his most capable students take on the project: Micah Stuhldreher and Wyatt Smrcka. They took first place in a national robotics competition, so they were a natural choice to tackle the locker door problem with a robotics solution. Micah and Wyatt wasted no time getting down to work and for an hour each school day, the boys brainstormed, built, and rebuilt various versions of the device until they landed on the perfect solution one year later.

Like in any device development, it took a lot of trial and error for Micah and Wyatt to make something that would work for their target audience. For example, they initially built a locker-opening button, but Nick wasn't strong enough to push it, so they replaced it with a sensor.

Now, between classes Nick steers his electric wheelchair to his locker and waves his hand over a sensor on the arm of the wheelchair. A few seconds later, the locker door swings open. Another wave closes the door. Nick can make it with ease—it may be a small thing, but it gives him a sense of independence.