It was a village in India. The people were poor. However, they were not unhappy. After all, their forefathers had lived in the same way for centuries.

    Then one day, some visitors from the city arrived. They told the villagers there were some people elsewhere who liked to eat frog's legs. However, they did not have enough frogs of their own, and so they wanted to buy frogs from other place.

    This seemed like money for nothing. There were millions of frogs in the fields around, and they were no use to the villagers. All they had to do was catch them. Agreement was reached, and the children were sent into the fields to catch frogs. Every week a truck arrived to collect the catch and hand over the money. For the first time, the people were able to dream of a better future.

    But the dream didn't last long. The change was hardly noticed at first, but it seemed as if the crops were not doing so well. More worrying was that the children fell ill more often, and, there seemed to be more insects around lately.

    The villagers decided that they couldn't just wait to see the crops failing and the children getting weak. They would have to use the money earned to buy pesticides(杀虫剂) and medicines. Soon there was no money left.

    Then the people realized what was happening. It was the frog. They hadn't been useless. They had been doing an important job—eating insects. Now with so many frogs killed, the insects were increasing more rapidly. They were damaging the crops and spreading diseases.

    Now, the people are still poor. But in the evenings they sit in the village square and listen to sounds of insects and frogs. These sounds of the night now have a much deeper meaning.

How to Fill Your Empty Walls with Beautiful Art

    If you've ever stared at an empty wall wondering what to put there, you're not alone. The idea of having the same museum print as everyone else doesn't seem that appealing.

    But, many people who may be interested in purchasing art are at a loss on how to start. The amount of time taken to discover art and artists that you truly love, and the expense of purchasing art, keep many people from even considering it.

    But now, TurningArt is solving this dilemma(困境). TurningArt is an online subscription(订阅 ) service that allows the average consumer to learn about art and be able to afford to own it. TurningArt offers art-lovers an online gallery of thousands of works, from highly accomplished and successful artists, to view in their homes and eventually buy if they want to.

    Here's how it works

    Visit TurningArt.com to browse through the work of hundreds of independent artists from across the country. Sorted by style, medium, color, price, artist, or even region, new art is added daily. You're sure to find several things you like.

    Then, simply sign up for one of TurningArt's subscription plans. These start at just $10 per month. TurningArt will send you your first piece, framed and ready to hang right out of the box. The piece will not be the original, but rather a museum-quality print produced together with the artist. You can request the next piece at any time. New prints arrive in a mailer that you can use to send back your old prints.

    You can enjoy each piece for one, two, or three months—however long you want. And, best of all, you never have to worry about taping, sizing, or centering your new print, because all prints are pre-sized to fit easily into the frame originally sent to you.

    If you've got an empty wall to fill, or simply like the idea of getting fresh art in your home every now and then, TurningArt is for you.

    A day in the life of 18-year-old David Lanster is full of typical teenage stuff: school, baseball practice, homework. And then he starts cooking.

    “Some nights I'm up until I am making pies, or even later if we're braising (蒸) beef,” said the student at Ransom Everglades High School in Florida, US.

    For the past year, Lanster and Kelly Moran, his classmate, have been hosting fancy dinner parties at Lanster's parents' home. Their meals have 17 courses and are all made by them.

    Their guests used to give them gifts to thank them, until the pair decided to do something nice for charity (慈善).

    “We got some really great Miami Heat tickets, a nice watch, and many kitchen gadgets (小物件),” Lanster said. “But we wanted to make this something positive for people other than us.”

    Lanster and Moran focused on Common Threads, a charity that aims to teach kids in poor communities (社区) to cook and make healthy eating choices.

    The young cooks ask their guests to give however much they want as payment for their meals. It all goes to Common Threads because Lanster's parents cover their food costs. After their last 12-person event, Lanster and Moran gave $1,600 (10,600 yuan) to the charity.

    Now, they're taking their show out of the kitchen and on the road. Lanster and Moran have started to organize private dinner parties with a similar model: the host pays for the ingredients, and the guests make a donation to a charity of their choice.

    Without formal (正规的) training, Lanster said he had been interested in cooking since he helped his mom in the kitchen when he was very young. He learned how to cook by reading cookbooks and watching TV programs.

    Outside the kitchen, the two are busy preparing their college applications.Neither is sure what they will do in the future, but they've promised their parents that they'll leave professional cooking alone until they finish school.

    “I could see a huge flow (流动) of water, coming down fast from very high. I had no idea of shape, or situation, or anything. It was just so big.”

    These are the words of the great English writer Charles Dickens. He wrote them when he was visiting Niagara Falls. This waterfall is on the border (边界) of the United States and Canada. It is one of the largest in the world, and the largest in North America.

    Niagara Falls is on the Niagara River. The river divides just before the waterfall, and there are actually three waterfalls. On the American side are American Falls and Bridal Veil Falls. Horseshoe Falls is mostly on the Canadian side. The name comes from its shape — like a horseshoe, in a half circle. Horseshoe Falls is the widest of the three.

    People mainly know about Niagara Falls because of its size and natural beauty. However, the Niagara River is also an important source of electricity.

    In the 1890s, the Westinghouse Electric Company built a large power system (电力系统) on the river. Many other companies also hoped to use the land around Niagara Falls for factories and power systems. However, around the same time, many people began to work to protect the natural area. Soon, the governments of the United States and Canada got involved with it. They protected the land around Niagara Falls. They made parks — green, natural areas. No one could buy this land for factories. For hundreds of years, millions of people have visited Niagara Falls to enjoy its beauty.

    Captain America and Blackpanther were about to defend Earth from the criminal Thanos when Kevin Foley first noticed something was wrong. Foley, a 46-year old information-technology worker from Kyle, Texas, was heading into the theater to see Avengers: Infinity War when he realized he was having trouble breathing normally. The same symptom struck again during another movie the following night, but more severe this time. Once the cast on the second film rolled, Foley took action: he looked at his wristwatch. It was a bigger step than you might imagine, because Foley was wearing an Apple Watch equipped with medical sensors and experimental software to track basic functions of his heart. And the watch was worried. It had, according to the display, detected signs of an irregular heartbeat.

    Before long, Foley was in an emergency room, where doctors hooked him up to an ECG(心电图), which showed that he was in atrial fibrillation(心房颤动), an irregular heartbeat that can lead to blood clots(血栓), stroke and other potentially disastrous diseases. Foley spent the next few days in the hospital while doctors worked to return him to a normal heart rhythm eventually turning to a procedure called electrical cardioversion to shock his heart back to normal. Foley is doing fine now. But he believes that, if not for the warning on his watch, he might not have sought help in time. “I would have never known,” he says.

    Foley and his watch were part of an experiment run by Apple and Stanford's medical school. But beginning Dec. 6, anyone can get an on-the-fly heart checkup, assuming they've paid $399 or more for an Apple Watch. That's when Apple will launch a software update that turns its latest model, called the Series 4, into a personal ECG, thanks to an innovative new sensor. Though less complicated than hospital ECG machines, the watch version can still provide basic information and warnings of potential risks worthy of a closer look by a medical professional.

    For Apple, this new ECG-on-your-wrist is its biggest bet yet that personal technology will inevitably include personal health. Along with competitors, Apple has already offered fitness functions, such as apps to track the steps you've walked. But with the new ECG scan, Apple is moving straight into medical aspects of heath, a distinction underlined by the fact it sought and received Food and Drug Administration clearance for the clearance for the heart monitor.

    Poetry is the artistic expression of the human thoughts and feelings in rhythmical and emotional language. Compared with prose (散文) , it lays more stress on rhythm, imagery (意象), emotion, and imagination. As its language is rhythmical, its sound is highly musical. We may say, "No rhythm, no poetry", no matter the rhythm of poetry is traditional as in metrical (格律的) style or "natural" as in free verse.

    So the poet must write carefully and reflectively in order to find words that not only fulfills the demands of meter and rhyme, but also expresses the meaning in a manner that complements the imagery and tone of the rest of the poem. This careful use of language is the most significant difference between ordinary prose and poetry.

    The ordinary prose writer neatly builds an argument using words the way a mason (石匠) builds a house using bricks; the poet is an artisan who creates a fieldstone hearth (大卵石壁炉炉床) — each stone or each word is turned over  examined, and often laid aside until it can be placed where its shape, weight, and color will contribute to the strength and beauty of the whole. Prose, according to Samuel Taylor Coleridge, is "words in their best order", and poetry is "the best words in their best order".

    The reader's chief delight in reading poetry comes from his response to its musical effect, which comes from many metrical patterns represented in conventional iambic (抑扬格) feet or from repetitions and parallel phrasing shown in free verse and from other elements of poetry.