We all know that exercise is good for your health. But some kinds of exercise may be better than others.

    Running, for example, may help to protect against heart disease and other health problems. Running may also help you live longer. Researchers say it is not important how far you run. It also does not matter how fast or even how often you run. As advertisements for the running shoes Nike say, “Just Do It.”

    Recently researchers studied more than 55,000 adults. About one-fourth of the adults reported running regularly. The study found these runners were considerably less likely than non-runners to die of any form of disease, including heart disease. In fact, the runners lived, on average, three years longer than the non-runners.

    This study lasted 15 years. During that time, more than 3,400 of the individuals died. About 1.200 of the deaths were linked to heart disease, hear, attack or stroke.

    One of the researchers is a man named D.C. Lee, a professor of Iowa State University Compared to non-runners, he said, runners showed a much lower risk of dying from some diseases. “Compared to non-runners, runners showed 30 percent lower risk of death by any causes, including heart attack, stroke and cancer. Also, runners compared to non-runners showed 45 percent lower risk of death by cardiovascular diseases（心血管疾病）, including heart attack and stroke.”

    D. C. Lee and the other researchers found that speed, distance and how often one runs made little difference in reducing the risk of death. The runners in the study averaged between 10 and 16 kilometers per hour. Mr Lee said slower runners and those who only ran once or twice a week were helped nearly as much as those who ran faster and further. “And also we looked at the inning over time and we found that persistent runners（over six years）showed the biggest benefits, as well.”

    Looking almost as fresh as the day it was bought, this McDonald's Happy Meal is in fact six months old. Photographed every day for the past six months by Manhattan artist Sally Davies, the kids meal of fries and burger hasn't any signs of mould(霉菌) or decay(腐烂).

    Sally put the Happy Meal on a shelf in her apartment and watched it with increasing shock. Even her dogs stopped trying to steal a free tasty snack.

    “I bought the meal on April 10 this year and brought home to see how it changed,” she said. “I chose McDonald's because it was nearest to my house, but the project could have been about any other fast food. The first thing that shocked me on the second day of the experiment was that it no longer gave out any smell. And my dogs stopped circling the shelf.”

    Sally expected the food to go mouldy after a few days. In fact, Mrs. Davies' surprise turned to shock as the food still had not shown any signs of decay after two weeks. “It was then that I realized that something strange might be going on with this food that I had bought,” she explained. “The appearance of the food did not change as the weeks turned to months. And now, at six months old, the food is plastic to touch. The only change that I can see is that it has become as hard as a rock.”

    The experiment has brought her amusement rather than fear. “Maybe I would be frightened at seeing this if I were a meat eater.” she said.

Londoners are great readers. They buy vast numbers of newspapers and magazines and of books — especially paperbacks, which are still comparatively cheap in spite of ever-increasing rises in the costs of printing. They still continue to buy "proper" books, too, printed on good paper and bound（装订）between hard covers.

    There are many streets in London containing shops which specialize in book-selling. Perhaps the best known of these is Charring Cross Road in the very heart of London. Here bookshops of all sorts and sizes are to be found, from the celebrated one which boasts of being "the biggest bookshop in the world" to the tiny, dusty little places which seem to have been left over from Dickens' time. Some of these shops stock, or will obtain, any kind of book, but many of them specialize in second-hand books, in art books, in foreign books, in books on philosophy, politics or any other of the countless subjects about which books may be written. One shop in this area specializes only in books about ballet!

    Although it may be the most convenient place for Londoners to buy books, Charring Cross Road is not the cheapest. For the really cheap second-hand books, the collector must venture off the beaten track, to Farringdon Road, for example, in the East Central district of London. Here there is nothing so impressive as bookshops. The booksellers come along each morning and pour out their sacks of books onto small hand carts. And the collectors, some professionals and some amateurs, have been waiting for them. In places like this they can still, occasionally, pick up for a few pence an old one that may be worth many pounds.

    Everyone's at it, even my neighbors. I thought I might be the only person left in the world who hadn't done an eBay deal. So, I decided to try my hand at online Auction（网上拍卖）.

    Buying for Beginners

    Sign up on www.eBay.co.uk. Most items （e.g. tables, computers and books）ready for auction will come with a picture and a short description; others may be marked with Buy It Now and have a fixed price. You can buy these right away.

    If the item is being auctioned, you offer the highest price you are prepared to pay and eBay bids（出价）for you. The bid will be increased little by little until it goes beyond your highest bid, then you are emailed and asked if you would like to bid again. Auctions last up to 10 days and when they finish, you get an email telling you whether you have won the item.

    How to Pay

    Sellers decide how they would like to be paid and you need to check this before placing a bid as you might not want to post a check or postal order （邮政汇票）. The easiest way is through PayPal, an online payment system that takes the money away from your credit card.

    Selling Made Sample

    If you plan to sell on eBay, it helps to include a picture of the item. I followed my friend's advice and put up the items I wanted to sell for a 10-day auction, starting on a Thursday. This way buyers had two weekends to bid.

    The Big Things in Life

    It's easy to post a small item, but furniture is a big part of eBay and this has to be collectively sent by deliverymen. Check the ways of delivery before you bid.

    TRAIL SAFE! is a unique safety training program designed specifically for National Park Service (NPS) Trail Volunteers, but is useful to everyone! It's based upon NPS Operational Leadership Training, where the human factor of safety is explored. TRAIL SAFE! captures (捕捉) the core learning objectives of the 16-hour Operational Leadership course while allowing volunteers to learn from their own homes online.

    The TRAIL SAFE! series includes eight video lessons, each ranging in length from 18 to 40 minutes long. Watch them over the course of multiple days, or "binge watch" the entire series in three hours—it's up to you—but please watch them in order from Lesson 1 through Lesson 8. After viewing the lessons, send your training verification (验证) emails to register your participation. When you have viewed and registered for all eight individual lessons, each participant will receive a TRAIL SAFE! pin and a SPE/GAR card in the mail for use in the field. Thank you for helping to make Sleeping Bear Dunes one of the safest work environments for NPS Trail Volunteers like yourself.

    Ready to start?

    Click on this link to access all TRAIL SAFE! videos: https://www.nps.gov/iatr/trail-safe.htm

    If you require Audio Descriptive versions of TRAIL SAFE! the link to those videos is also available on the Ice Age Trail site.

    Record your participation

    In order to receive credits for your participation, please fill in your answers to the following questions and email to: Matthew mohrmannps.gov.

    Which video lesson did you just complete viewing?

    Name of the Trail where you volunteer.

    Your name and full mailing address, so we may send your course completion materials to you.

    Names and addresses of others if you are viewing this lesson in a group setting.

    Optional: Please let us know any comments or suggestions you have about this lesson.

    Upon registering your completion for the entire eight lesson series, you'll receive your TRAIL SAFE! pin and risk assessment card via mail.

    Travelling can be a fun way to gain life experiences, especially during a week-long school vacation. But what if you're a student and don't have enough money for a trip? Don't worry.

Here are some useful tips.

    Save: This probably is the most important preparation for travelling. Cut expenses to fatten your wallet so you'll have more choices about where to go and how to get there.

    Plan ahead: Don't wait until the last minute to plan your trip. Tickets may cost more when bought on short notice. Giving yourself several months to get ready can mean security(安全)and savings.

    Do your homework: No matter where you go, research the places you will visit. Decide what to see. Travel books will provide information on the cheapest hotels and restaurants.

    Plan sensibly(明智地): Write down how much you expect to spend for food and hotels. Stick to your plan or you may not have enough money to cover everything.

    Travel in groups: Find someone who is interested in visiting the same places. By travelling with others you can share costs and experiences.

    Work as you go: Need more money to support your trip? Look for work in the places you visit.

    Go off the beaten path: Tourist cities may be expensive. You may want to rethink your trip and go to a lesser-known area. Smaller towns can have many interesting activities and sights.

    Pack necessary things: The most important things to take are not always clothes. Remember medicine in case you get sick and snacks in case you can't find a cheap restaurant.

    Use the Internet: The Net can help to save money. Some useful websites include www. Iravelocity.com, www.bargains-lowest fare.com and www.Economy travel.com.

    By planning sensibly, even students can enjoy the travel. Your travel experiences will be remembered for a lifetime.