We produce 500 billion of plastic bags in a year worldwide and they are thrown away polluting oceans, killing wildlife and getting dumped in landfills where they take up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a solution.

    The 16-year-old Canadian high school student, Daniel Burd, from Waterloo Collegiate Institute, has discovered a way to make plastic bags degrade(降解) in as few as 3 months, a finding that won him first prize at the Canada Wide Science Fair, a ＄10,000 prize, a ＄20,000 scholarship, and a chance to revolutionize a major environmental issue.

    Burd's strategy was simple: Since plastic does eventually degrade, it must be eaten by microorganisms(微生物)．If those microorganisms could be identified, we could put them to work eating the plastic much faster than under normal conditions.

    With this goal in mind, he grounded plastic bags into a powder and concocted(调制) a solution of household chemicals, yeast(酵母) and tap water to encourage microbes growth．Then he added the plastic powder and let the microbes work their magic for 3 months．Finally, he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead bacteria as a control．Sure enough, the plastic exposed(暴露) to the live bacteria was 17% lighter than the control after six weeks.

    The inputs are cheap, maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.

    “Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me．One day, I got tired of it and I wanted to know what other people are doing with these plastic bags．The answer: not much．So I decided to do something myself.” Said Daniel Burd.

    Sometimes you'll hear people say that you can't love others until you love yourself. Sometimes you'll hear people say that you can't expect someone else to love you until you love yourself. Either way, you've got to love yourself first and this can be tricky. Sure we all know that we're the apple of our parents' eyes, and that our Grandmas think we're great talents and our Uncle Roberts think that we will go to the Olympics. But sometimes it's a lot harder to think such nice thoughts about ourselves. If you find that believing in yourself is a challenge, it is time you build a positive self-image and learn to love yourself.

    Self-image is your own mind's picture of yourself. This image includes the way you look, the way you act, the way you talk and the way you think. Interestingly, our self-images are often quite different from the images others hold about us. Unfortunately, most of these images are more negative than they should be. Thus changing the way you think about yourself is the key to changing your self-image and your whole world.

    The best way to defeat a passive self-image is to step back and decide to stress your success. That is, make a list if you need to, but write down all of the great things you do every day. Don't allow doubts to occur in it.

    It very well might be that you are experiencing a negative self-image because you can't move past one flaw or weakness that you see about yourself. Well, roll up your sleeves and make a change of it as your primary task. If you think you're silly because you aren't good at math, find a tutor. If you think you're weak because you can't run a mile, get to the track and practice. If you think you're dull because you don't wear the latest trends, buy a few new clothes. But remember, just because you think it doesn't mean it's true.

    The best way to get rid of a negative self-image is to realize that your image is far from objective, and to actively convince yourself of your positive qualities. Changing the way you think and working on those you need to improve will go a long way towards promoting a positive self-image. When you can pat yourself on the back, you'll know you're well on your way. Good luck!

How Super Are Supermarkets?

    Buying e week's groceries is tiring. You want to get it over and done with quickly, so you head for the nearest supermarket, you find everything you need under one roof, and you feel glad that those days of going in and out of different shops in the high street are over. Supermarkets seem to be a big plus. There is a downside, though.

    In the UK 90% of all the food people consume is bought at 5 different supermarket chains. This makes these companies extremely powerful, which lets them use their huge buying power to squeeze small suppliers to get the best deal. Milk is a good example. Supermarkets like to use things like milk, which is the top of almost everyone's shopping list to attract customers. To offer the lowest price possible to the consumer, the supermarkets force dairy farmers to sell milk at less than the cost of production. Supermarkets guarantee their good profits while farmers are left struggling to make ends meet, and the taxpayer pays to support the system without even knowing it.

    It would be nice if local grocers supported local agriculture. But for the big supermarkets this just doesn't make sense. Supermarkets don't want little farmers thinking they can decide prices. So supermarkets have started a global search for the cheapest possible agricultural produce. In many supermarkets it is difficult to find anything which is produced locally.

    UK farmers used to grow a lot of apples. Not anymore. In 1999 36% of apples were imported. By 2015 the figure had risen to 80% and the domestic production of apples had fallen by two thirds. The consumer might just be happy to get a reasonably priced meal made up of foods from Thailand, Spain, Italy and Zambia, but we should also bear in mind the Influence on local producers.

    Then there's packaging. Supermarkets like everything to be packed and wrapped so it can be piled neatly on shelves. Supermarkets produce nearly 10 million tons of waste packaging in the UK every year, of which less 5%is recycled. Some supermarkets make sure that large recycling bins are obvious in their car parks, showing that they are environment-friendly. But that is just an image.

    When a new supermarket is planned there are claims about the number of new jobs that will be created. Unfortunately, the number of jobs lost in the area is larger than the number of new positions in the supermarket. On average each new supermarket leads to the loss of 276 jobs.

    However, the modern world is all about shopping, and the freedom to buy whatever you what, so it would be impossible to stop people shopping at some particular kind of shop. But some measures do need to be taken when small suppliers lose profits, local producers suffer, sea levels rise and jobs are lost, anyway, we can't just care about a free car park and special offers.

Primary Source Holiday Shopping Night at Ten Thousand Villages

● Shop for your holiday gifts and give back to Primary Source at Ten Thousand Villages on Friday, December 4! 15% of all sales from 3:00 p. m．—7:00 p. m. that day will be donated to Primary Source. Join us for light refreshments and enjoy beautiful handmade gifts from artisans around the world. All are welcome!

Primary Source's Holiday Shopping Night

Friday, December 4, 2014

3:00 p. m．—7:00 p. m.

Ten Thousand Villages

226 Harvard Street, Brookline, Massachusetts (Coolidge Corner)

Download our flyer and tell your friends!

    Ten Thousand Villages provides vital, fair income for the people from developing countries by marketing their handicrafts and telling their stories in North America. Learn more and preview toys, home decor, jewelry, and other gifts online.

● Can't join us on Dec. 4? At GoodShop, 30% of your spending will be given to Primary Source. The next time you're ready to make an online purchase(购物), visit www. goodshop. com and enter “Primary Source” in the space provided. Click “verify” and choose from more than seven hundred popular stores and sites, from Apple to Zappos. GoodShop is free and easy to use, and each purchase you make will help Primary Source provide global education materials for schools all over New England.

    It was almost the worst birthday of Abraham Lincoln's life.

    On February 11, 1861 (the day before he turned fifty-two), Lincoln left for Washington to become the nation's sixteenth President. As he left home in Springfield, Illinois, Lincoln handed his son Robert a black oilskin(油布) bag, and told him to keep it carefully. He did not tell Robert what was inside.

    Unknown to his seventeen-year-old son, Lincoln had placed his newly written inaugural speech in the bag. It was to be the most important speech he ever made. And it was his only copy.

When the train arrived in Indianapolis—the first stop on the long journey—Lincoln rode off in a special carriage without his family. Robert walked from the station to the local hotel.

    When Robert arrived at the hotel, he learned that his family's rooms were not ready. So he asked that the bag should be held at the front desk. Then he went off to be with friends.

    On his return, Robert found his father waiting anxiously. Where was the bag? Robert explained that he had checked it at the desk.

An angry Lincoln sped to the hall and leaped over the front desk. He began searching through a huge pile of luggage.

    As puzzled guests looked on, Lincoln dragged from the pile a familiar-looking black bag and opened it, only to find someone else's dirty clothes. It was the wrong bag. Back he went to the pile.

    At last he found the valuable bag and the speech inside. Lincoln handed it to his son and said strictly, “Now you keep it!”

    It was the one and only time, Robert said, that his father had ever lost his temper at him. But with his speech fond and his birthday yet to be celebrated, Abraham Lincoln grew cheerful. As Robert proudly recalled, “Father did not scold(责骂).”

Dear Students,

    I am delighted to be your guest.

    I would like to tell you about myself. I have been a news reporter for the past fifteen years. I chose this job so I could travel the world, but the job has taught me many unforgettable lessons. The work is sometimes difficult. I have seen famines, wars, earthquakes, poverty and death. But I have also seen courage, hope and happiness.

    In India, I visited a city where there were many homeless children. Some were as young as four years old. They lived in the streets and survived by begging or stealing. But then a wonderful lady called Rosa opened a home for them. Within one year, she was looking after two hundred children. She clothed them, fed them, and taught them. She gave them hope.

    Another time, I was in Turkey after a terrible earthquake, in one place. I found an old lady whose house was in ruins, her son was missing and rescuer workers said there was no chance that he was still alive. But the old lady did not give up hope. For four days, she moved heavy stones one at a time by herself. She did not stop until she found her son. He was alive.

    Here in China, I met a young boy with a serious condition. He had undergone twenty operations and spent nearly his whole life in hospital. I thought he would be sad, but when I met him, his smile was so warm and welcoming.

    In life, we need role models that we can admire and learn from. When my life is difficult, I try to remember the courage and goodness of these three people.