If humans were truly at home under the light of the moon and stars, we would go in darkness happily, the midnight world as visible to us as it is to the vast number of nocturnal(夜间活动的) species on this planet. Instead, we are diurnal creatures, with eyes adapted to living in the sun's light. This is a basic evolutionary fact, even though most of us don't think of ourselves as diurnal beings. Yet it's the only way to explain what we've done to the night: We've engineered it to  receive us by filling it with light.

    The benefits of this kind of engineering come with consequences 一 called light pollution 一 whose effects scientists are only now beginning to study. Light pollution is largely the result of bad  lighting design, which allows artificial light to shine outward and upward into the sky. III-designed lighting washes out the darkness of night and completely changes the light levels 一 and light  rhythms — to which many forms of life, including, ourselves, have adapted. Wherever human light spills into the natural world, some aspect or life is affected.

    In most cities the sky looks as though it has been emptied of stars, leaving behind a vacant haze(霾) that mirrors our fear of the dark. We've grown so used to this orange haze that the original glory of an unlit nigh, - dark enough for the planet Venus to throw shadow on Earth, is wholly beyond our experience, beyond memory almost.

    We've lit up the night as if it were an unoccupied country, when nothing could be further form the truth. Among mammals alone, the number of nocturnal species is astonishing, Light is a powerful biological force, and on many species it acts as a magnet(磁铁). The effect is so powerful that scientists speak of songbirds and seabirds being “captured” by searchlights on land or by the light from gas flares on marine oil platforms. Migrating at night, birds tend to collide with brightly lit tall buildings.

    Frogs living near brightly lit highways suffer nocturnal light levels that are as much as a million times righter than normal, throwing nearly every aspect of their behavior out of joint including most other creatures ,we do need darkness. Darkness is as essential to our biological welfare, to our internal clockwork, as light itself.

    Living in a glare of our making,we have cut ourselves off from our evolutionary and cultural heritage—the light of the stars and the rhythms of day and night .In a very real sense light pollution causes us to lose sight of our true place in the universe, to forget the scale of our being, which is best measured against the dimensions of a deep night with the Milky Way—the edge of our galaxy arching overhead.

    Watching some children trying to catch butterflies one hot August afternoon, I was reminded of an incident in my own childhood. When I was a boy of 12, something happened to me that cured me forever of wanting to put any wild creature in a cage.

    We lived on the edge of a wood, and every evening at dusk the mockingbirds would come and rest in the trees and sing. It's the most beautiful sound in the world.

     I decided that I would catch a young bird and keep it in a cage and in that way would have my own private musician.

    I finally succeeded in catching one and put it in a cage. I felt very pleased with myself and looked forward to some beautiful singing from my tiny musician.

    I had left the cage out on our back porch, and on the second day, my new pet's mother flew to the cage with food in her mouth. The baby bird ate everything she brought to it. I was pleased to see this. Certainly the mother knew better than I how to feed her baby.

    The following morning when I went to see how my pet bird was doing, I discovered it on the floor of the cage, dead. I was shocked! What had happened! I had taken excellent care of my little bird, or so I thought.

    Arthur Wayne, the famous ornithologist, happened to be visiting my father at the time, hearing me crying over the death of my bird, explained what had occurred. “A mother mockingbird, finding her young in a cage, will sometimes bring it poison berries(浆果). She thinks it better for her young to die than to live in captivity.”

    Never since then have I caught any living creature and put it in a cage. All living creatures have a right to live free.

    If you're planning to go on a diet o1 if you suffer from serious conditions like diabetes( 糖尿病), knowing exactly what and how much you're eating is essential. In this day and age, we have calorie and nutritional calculators even on our smartphones, but they act only as guides, whereas Panasonic's revolutionary new device, CaloRieco, actually analyzes the food on your plate and provides accurate in formation about in just a few seconds.

    You've probably used calorie calculators before,and you know that they only offer general information. For example, a calculator will tell you the average number of calories in a hamburger, but it can't tell you exactly how many calories are in the hamburger. The same goes for nutrients like protein or fats. And this is what makes the new CaloRieco so special.

    Displayed at a recent tech show, CaloRieco is a high-tech device that uses light reflection technology to determine the nutritional values of almost any food and also provide accurate calorie estimates.All you have to do is put your plate in the box-shaped device and wait between 10 and 20 seconds for it tc analyze all the food on there.

    Once it's done analyzing the various ingredients(原料)in your meal, CaloRieco displays the number of calories, as well as the nutritional content on an LED display, According to Panasonic, the device is able to recognize the vast majority of foods, except soups and very dark dishes.

    CaloRieco can also connect to your smartphone via an app, and send all the data about analyzed foods to your handheld, so you car access it whenever you need.

    Panasonic said that its outstanding invention is aimed at dieters and diabetes sufferers, both of which make up a large market.Unfortunately,you'llhave to wait a bit longer to your hands on your very own CaloRieco, as the device presented a the show is just a prototype(样品) which needs to be improved. It 's scheduled to hit the market sometime in the next few years, but the price remains unknown.

    Do you know that November is National Novel Writing Month (NaNoWriMo)? You can find the NaNoWriMo Young Writer's program at ywp.nanowrima.org. It is a challenge（挑战）to write a 50,000-word novel in one month.

    The program began in 1999 in San Francisco with only 21 members. Later year, more than 400,000 took up the challenge. The writers can choose what they want to write about. On November 1st, writers visit the website and start to update（更新）their word count. They can communicate with other writers there as well. All the writers have to stop writing on November 30th.

    It is okay if you have never written a book before. The website provides lesson plans and workbooks for beginners. You can use them to improve writing skills in your novel. Then you can start planning what your novel will be about.

    Are there any books published（出版）from the NaNoWriMo program? Here are a few:

The Night Circus by Erin Morgenstern

Water for Elephants by SaraGruen

Entrychats by Cecile Duquenne

    Are there any young readers who want to join in this program? If you want, we hope you can write the best novel. If you have not heard of NaNoWriMo, but you have a good story in mind, join us!

    A Hobby is a regular activity that is done for enjoyment, typically during one's leisure(闲暇的) time. By continually taking part in a particular hobby, one can acquire practical skill and knowledge in that area. Is travel a good hobby? Travel, in the youngest sort, is a part of education and, in the elder, a part of experience. Some may think otherwise. To them, visiting churches, castles, libraries, etc. is an absolute wastage of time. They may further say that one can read the account of these or see the films of the important places of the world. They forget that touch of actuality gives a different type of sensation and satisfaction.

    Travelling may be an expensive hobby but it makes up for the financial loss. If a traveller has interest in life and its manifestations(表现), one can find much to keep oneself absorbed and happy. A student of any stream can definitely find something of his own interest and studies. One can definitely find everything that satisfies his cravings for knowledge and feelings.

    As a hobby, travelling keeps us busy during leisure time; it is the best method to make use of time. Till a person breaks from dull routine, physically and mentally, one cannot find satisfaction. Travelling helps us to achieve this break. At a new place, one is curious to know and eager to gather all the unknown information about the place which he has neither read nor heard before and he gets thrills and surprises which keep the interest and enthusiasm alive and encourage us to keep our journey on.

    While travelling, one comes across a number of people from varied backgrounds and places. By interacting with them, he comes to know about their traditions also. In case one has psychological bent of mind, one increases one's experience and power to understand others. Understanding human nature is, perhaps, the best part of education. Travelling satisfies all demands of a good hobby-it is absorbing education and refreshment to the mind, body and soul.

    Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away. He can play, catch and hit a ball as well as his son. A mother who has not thought about the words for years can teach her daughter the poem that begins "Twinkle, twinkle, little star" or remember the story of Cinderella or Goldilocks and the Three Bears.

    One explanation is the law of overlearning, which can be stated as follows: Once we have learned something, extra learning trials (尝试) increase the length of time we will remember it.

    In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks. We not only learn but overlearn.

    The multiplication tables (乘法口诀表) are an exception (例外) to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.

The law of overlearning explains why cramming (突击学习) for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.