Next autumn when you see wild geese heading south for the winter flying in a V formation, you might think about what scientists have discovered as to why they fly that way.

    As each bird flaps its wings, it creates uplift(提升) for the bird immediately following. By flying in a V formation the whole group adds at least 71% greater flying range than if each bird flies on its own.

    People who share a common direction and sense of community can get where they are going more quickly and easily because they are traveling on the push of one another.

    When a wild goose falls out of the formation，it suddenly feels the drag and resistance of trying to go alone and quickly tries to get back into the formation to take advantage of the lifting power of the bird in front. When the head goose gets tired，it flies back into the formation and another goose flies to the front. It is wise to take turns doing difficult jobs whether it is people or wild geese flying south.

    Wild geese honk (发出雁叫声) from behind to inspire those up front to keep up their speed. What can we learn from this?

    When a wild goose gets sick or wounded by gunshots，and falls out of the formation，two other geese will fall out with that goose and follow it down to lend help and protection. They will stay with the fallen goose until it is able to fly or until it dies，and only then will they go on with their own or with another formation to catch up with their group.

    Stephen Hawking, the brilliant British theoretical physicist who published wildly popular books exploring the mysteries of the universe, has died, according to a family spokesman. He was 76.

    Considered by many to be the world's greatest living scientist, Hawking was also a cosmologist, astronomer, mathematician and author of numerous books including the landmark“A Brief History of Time,” which has sold more than 10 million copies.

    With fellow physicist Roger Penrose, Hawking combined Einstein's theory of relativity with quantum theory(量子理论) to suggest that space and time would begin with the Big Bang and end in black holes. He also discovered that black holes were not completely black but emit(释放) radiation and would likely eventually evaporate(蒸发) and disappear. “It will be difficult enough to avoid disasters on planet Earth in the next 100 years, let alone next thousand, or million. The human race shouldn't have all its eggs in one basket or on one plant. Let's hope we can avoid dropping the basket until we have spread the load.”

    Hawking suffered from ALS (amyotrophic latcral sclerosis), a disease which is usually fatal within a few years. He was diagnosed in 1963, when he was 21, and doctors initially gave him only a few years to live. The disease left Hawking wheelchair-bound and paralyzed. He was able to move only a few fingers on one hand and was completely dependent on others or on technology for everything—bathing, dressing, eating, even speech. “I have been lucky that my condition has progressed more slowly than is often the case. But it shows that one need not lose hope.” Dramatically, he even guest-starred in the “Star Trek”, “The Simpsons” and the 2014movie “The theory of Everything”.

    Hawking leaves behind three children and three grandchildren. “We are deeply saddened that our beloved father passed away today,” Hawking's children, Lucy, Robert and Tim, said in a statement. “He was a great scientist and an extraordinary man whose work and legacy will live on for many years. His courage and persistence with his brilliance and humor inspired people across the world. “We will miss him forever.”

    Phillip Island is a small island and nature reserve off the coast of South Australia, about 140 km from Melbourne. On the island you can see koalas, kangaroos and the main attraction, the Penguin Parade（归巢）on Summerland Beach.

    As dusk was approaching, we made our way down to the beach, as did everyone else. On the beach was a stone grandstand, rather cold on the behind, so bring a coat or blanket to sit on. As it got darker, people talked less, keeping an eye out on the beach to see the arrival of that first penguin.

    Suddenly there was movement at the edge of the surf and all heads turned as one. There, standing by the edge of the water was the smallest penguin we had ever seen. He looked left, then right, as if he was considering crossing a busy road and then he ran quickly across to the sand dunes and the penguin holes.

    He must have been the scout(侦查员), because after him, there came groups of penguins, some consisted of two or three penguins, and some had about ten or fifteen, but they all made the same mad dash across the sand into the holes, as if they couldn't get there fast enough. The groups started to lessen and finally no more penguins emerged from the sea.

    We sat on the grandstand for a while, not talking, just feeling awed(敬畏的) at what we'd just seen. Neither of us had ever seen penguins in the wild before, only in zoos and it was an amazing feeling.

    You could see the penguins here every evening and morning, but they weren't in cages or in small pools. The sea was their playground and it is a sight we would definitely recommend to anyone.

    You weren't allowed to take flash photographs as it scared them. After the penguins had gone to their holes, you could walk along boardwalks and see them there. That's got to be worth a look.

    On her first morning in America last summer, my daughter went out to explore her new neighborhood alone, without even telling my wife or me. Of course we were worried; we had just moved from Berlin, and she was just 8. But when she came home, we realized we had no reason to panic. Beaming with pride, she told us how she had discovered the little park around the corner, and had made friends with a few local dog owners.

    When this story comes up in conversations with American friends, we usually meet with polite disbelief. Most are horrified by the idea that their children might roam(闲逛) around without adult supervision(监管).

    A study by the University of California has found that American kids spend 90 percent of their free time at home, often in front of the TV or playing video games. Such narrowing of children's world has happened across the developed world. But German parents are generally much more accepting of letting children take some risks.

    “We are depriving(剥夺) them of opportunities to learn how to take control of their own lives,” writes Peter Gray, a research professor at Boston College. He argues that this increases the chance that they will suffer from anxiety, depression, and various other mental disorders, which have gone up dramatically in recent decades(十年).

    I am no psychologist like Professor Gray, but I know I won't be around forever to protect my girls from the challenges life holds in store for them. And by giving kids more control over their lives, they learn to have more confidence in their own abilities.

    Model Railroading

    Would you like to know a fun way to learn about math? Well, you can do that with model railroading. Yes, it's true. You can learn about many school topics without using a school book. Besides that, there are many other benefits that model railroading brings us as well. In this article, we will discuss just a few of those benefits of model railroading.

    Patience and problem solving skills

    When you build a model railroad, you have to plan your railroad out. You have to decide where the tracks (轨道) will go, where to put buildings, where to put streets and any other things you would like to add to your model railroad. Also, you have to think about any problems you may have with the design you choose. How will you make railroad crossings? How will you design hills, mountains, and rivers? Deciding on what to do with your model railroad takes a lot of thought and patience, but it is not as difficult as you may think.

    Building skills

    With model railroading, you learn how to put together plastic models of buildings. Also, you can learn how to build a table for your design, or make scenery for the geography of your design. Your model railroad runs on electricity, so you learn about electronics as well. These are skills that not only help you build a model railroad; these skills will help you throughout life.

    Fun for family and friends

    Different from many video games, model railroading is a social hobby that lets you communicate with family and friends. This is because you have to communicate with family and friends as you build and run your model railroad. By spending time with the people in your life you love and care about, you learn to become closer and care more for each other. This is one of the best parts of model railroading as a hobby. Of course, the best part about model railroading is running the trains. Watching the trains run around the track and make all the sounds and do all the things that real trains do gives people hours of enjoyment. Also, there is great satisfaction in the fact that you, your family, and your friends built the model railroad.

    I hope you can learn to enjoy model railroading and experience all the benefits you just read about and many others. Happy railroading!

    It all started in 2007 when James Bowen, a thirty­something drug addict who survived by playing guitar on the street, found an orange cat sitting in front of the door of his apartment.

    Bowen noticed the cat was wounded. Without hesitation, the young man took him to the Humane Society and spent the little money he had on medicine to heal him.

    Shortly thereafter, the cat, who was healing and feeling much better, began to follow the musician when he left the house. Then one day the cat got on the bus that Bowen took to the place where he worked.

    That's how the cat, who had recently been named Bob, began to accompany his human friend to his musical performances. Bob's mere presence attracted the attention of passers­by. He and Bowen would finish off each song with a high five. Pretty soon, the images of Bob wearing a scarf while sitting on the musician's shoulder, or keeping him company while he played the guitar, began to go viral all over the world.

    Eventually, the news found out about the pair and did a story for the magazine Islington Tribune. It was not long after that when a book agent appeared in their lives and gave them a chance to tell their story.

    By then, Bowen, who had managed to get away from drugs, wrote a novel called A Street Cat Named Bob. He related in great detail how meeting the cat changed him.

    The book soon sold more than six million copies and even spread beyond the borders of the United Kingdom. In fact, it was translated into thirty languages.

    Through all of these changing circumstances, Bob has always been with Bowen—on his shoulder.

    You can't make up a story like this. But life always gives opportunities to those who know how to get hold of them. So if you are ever in a position where a cat has chosen you, don't ignore it. You can't imagine all the good that life may have in store if you decide to accept the proposal.