In the last few years the popularity of eBooks has exploded．The advantages are clear：You can carry as many books with you as you want．You can simply download every book you like and instantly start reading instead of having to wait for the book to arrive by mail．

    However，one thing hadn't changed．If you wanted to rent a book you were still forced to use hardcopy books．Until now that is, Amazon．com recently announced the start of a new program where you can rent eBooks．

Where to rent eBooks？

    As mentioned before，Amazon．com is the first and currently the only retailer (零售商) that has a program in place for renting eBooks． Luckily，Amazon is the largest online retailer in the world and their eBook assortment (分类) is massive．They are also the producer of the Kindle，the most popular Reader，which means you can be sure that the eBooks you rent will work．

You can currently only rent Textbooks．But this is likely to change as soon as word gets out that you can save money by renting eBooks.

Why rent eBooks at Amazon?

* Save money：Save up to 80% of the normal price of the eBook．

* Decide how long you rent：From 30 days to 360 days，you decide how long you want it．You can extend the time by as little as a day．Or simply buy the eBook if you want to keep it after all．

*Use any device：If you rent an eBook from Amazon，you can read it on your PC，Mac，iPad，iPhone，Android device，Windows Phone 7．Blackberry．or Kindle．

* Keep your notes：Do you like to keep annotations (注释) and highlights in your eBooks？Don't worry．You can always revisit your notes and highlights through Amazon．com．

How to rent eBooks？

    Simply search for the eBook you want to rent on Amazon．com and select the "Rent eBooks" option. After that，a new page will open where you can select how long you'd like to rent the eBook．You can read eBooks for a period of 30 to 360 days．

    You decide how long you need the eBook．If you later find out you need it for longer, you can simply extend the time．Or buy it for the normal price whenever you want.

    Once you've chosen the time you want to rent the eBook，you simply go to checkout．Or you can use the "Rent now" button．

    The American believe that anybody can become President of the United States. In a recent Hollyhood comedy(喜剧), that is exactly what happens.

    Dave Kovic, played by Kevin Kline, is a kind-hearted man who runs a business that finds people jobs. He leads a typical(典型的) American way of life, except for one thing— he looks exactly like the President, Bill Mitchell. In fact, the only thing that makes him different from the nation's leader is that he is very nice!

    The president has started using look-alikes during some public appearance. Dave is offered a chance to “serve his country” by becoming one. However, things go wrong. The President becomes very ill and Dave ends up acting as the President forever.

    Director Ivan Reitman, who made the popular and successful comedies like Twins, Ghostbusters and Legal Eagles, could have gone for easy laughs by making fun of the American government. Instead, Dave is an attractive comedy about an ordinary man in extraordinary situations. Kevin Kline gives a double performance as Dave and the President, and Sigourney Weaver is at her best as his First Lady. The love story that develops between her role and Dave is a real classic(经典).

    The film is 100% American. However, if you've ever felt that anybody could do a better job running the country than the people in power, then you'll enjoy Dave!

    No one knows for sure when advertising first started. It is possible that it grew out of the discovery that some people did certain kinds of work better than others did them. That led to the concept of specialization, which means that people would specialize, or focus, on doing one specific job.

    Let's take a man we'll call Mr. Fielder, for example. He did everything connected with farming. He planted seeds, tended the fields, and harvested and sold his crops. At the same time, he did many other jobs on the farm. However, he didn't make the bricks for his house, grind the wheat for his flour, or cut his trees into boards. He also did not make the plows(犁), the work boots, or any of the other hundreds of things a farm needs. Instead, he got them from people who specialized in doing each of those things.

    Suppose there was another man we shall call Mr. Plowright. Using what he knew about farming and working with iron, Mr. Plowright invented a plow that made farming easier. Mr. Plowright did not really like farming himself and wanted to specialize in making really good  plows. Perhaps, he thought, other farmers will trade what they grow for one of my plows.

    How did Mr. Plowright let people know what he was doing? Why, he advertised, of course. First he opened a shop and then he put up a sign outside the shop to attract customers. That sign may have been no more than a plow carved into a piece of wood and a simple arrow pointing to the shop door. It was probably all the information people needed to find Mr. Plowright and his really good plows.

    Many historians believe that the first outdoor signs were used about five thousand years ago. Even before most people could read, they understood such signs. Shopkeepers would carve into stone, clay, or wood symbols for the products they had for sale.

    A medium, in advertising talk, is the way you communicate your message. You might say that the first medium used in advertising was signs with symbols. The second medium was audio, or sound, although that term is not used exactly in the way we use it today. Originally, just the human voice and maybe some kind of simple instrument, such as a bell, were used to get people's attention.

    A crier, in the historical sense, is not someone who weeps easily. It is someone, probably a man, with a voice loud enough to be heard over the other noises of a city. In ancient Egypt, shopkeepers might hire such a person to spread the news about their products. Often this primitive form of advertising involved a newly arrived ship loaded with goods. Perhaps the crier described the goods, explained where they came from, and praised their quality. His job was, in other words, not too different from a TV or radio commercial in today's world.

    Have you ever trained your brain? Now there are some new suggestions, such as eating dark chocolate and having cold meat for breakfast. You should also avoid watching soap operas, spending time with people who complain or follow fat-free diets, according to a new book on getting “brain-fit”.

    Many of the suggestions in Teach Yourself Training Your Brain are surprising. The book says to read out loud while holding a baby. Writers Terry Horne and Simon Wotton say their advice is from the latest research by experts around the world.

    “For years we have thought our brain capability is decided by our genes. But it's now clear that it depends on our lifestyle. What we eat and drink, how we learn at school and what type of feelings we have are all important,” said Horne.

    The book talks about the most up-to -date thinking in science about how diet, the environment, stress and other sides of modern life affect our brain capacity. It also offers advice and exercises. The book comes as more and more people are spending money on books, DVDs and computer games, which can improve their brain's capability.

    Horne believes that people need to make changes to their lifestyles to increase their brain capacity. Happiness, confidence and an optimistic nature help the brain, he added.

    “So mix with people who make you laugh, or share the same interests as you. And avoid people who complain,” said Horne. “People who are negative will make you sad, which means you won't achieve things.”

    While famous foreign architects are invited to lead the designs of landmark buildings in China such as the new CCTV tower and the National Center for the Performing Arts, many excellent Chinese architects are making great efforts to take the center stage.

Their efforts have been proven fruitful. Wang Shu, a 49-year-old Chinese architect, won the 2012 Pritzker Architecture Prize — which is often referred to as the Nobel Prize in architecture —on February 28. He is the first Chinese citizen to win this award.

    Wang serves as head of the Architecture Department at the China Academy of Art (CAA). His office is located at the Xiangshan campus of the university in Hangzhou, Zhejiang Province. Many buildings on the campus are his original creations.

    The style of the campus is quite different from that of most Chinese universities. Many visitors were amazed by the complex architectural space and abundant building types. The curves (曲线) of the buildings perfectly match the rise and fall of hills, forming a unique view.

    Wang collected more than 7 million abandoned bricks of different ages. He asked the workers to use traditional techniques to make the bricks into walls, roofs and corridors. This creation attracted a lot of attention thanks to its mixture of modern and traditional Chinese elements.

    Wang's works show a deep understanding of modern architecture and traditions. Through such a balance, he had created a new type of Chinese architecture, said Tadao Ando, the winner of the 1995 Pritzker Prize.

    Wang believes traditions should not be sealed in glass boxes at museums. "That is only evidence that traditions once existed," he said.

    "Many Chinese people have a misunderstanding of traditions. They think tradition means old things from the past. In fact, tradition also refers to the things that have been developing and that are still being created, "he said.

    "Today, many Chinese people are learning Western styles and theories rather than focusing on Chinese traditions. Many people tend to talk about traditions without knowing what they really are," said Wang.

    The study of traditions should be combined, with practice. Otherwise, the recreation of traditions would be artificial and empty, he said.

    Next month, I'm traveling to a remote area of Central Africa and my aim is to know enough Lingala — one of the local languages — to have a conversation. I wasn't sure how I was going to manage this — until I discovered a way to learn all the vocabulary I'm going to need. Thanks to Memrise, the app I'm using, it feels just like a game.

    "People often stop learning things because they feel they're not making progress or because it all feels like too much hard work," says Ed Cooke, one of the people who created Memrise. "We're trying to create a form of learning experience that is fun and is something you'd want to do instead of watching TV."

    Memrise gives you a few new words to learn and these are "seeds" which you plant in your "greenhouse". When you practice the words, you "water your plants". When the app believes that you have really remembered a word, it moves the word to your "garden". And if you forget to log on (登录), the app sends you emails that remind you to "water your plants".

    The app uses two principles about learning. The first is that people remember things better when they link them to a picture in their mind. Memrise translates words into your own language, but it also encourages you to use "mems". For example, I memorized "motele", the Lingala word for "engine", using a mem I created — I imagined an old engine in a motel (汽车旅馆) room.

    The second principle is that we need to stop after studying words and then repeat them again later, leaving time between study sessions. Memrise helps you with this, because it's the kind of app you only use for five or ten minutes a day.

    I've learnt hundreds of Lingala words with Memrise. I know this won't make me a fluent speaker, but I hope I'll be able to do more than just smile when I meet people in Congo. Now, I need to go and water my Vocabulary!