New mercury(汞) threat to oceans from climate change

    Rising temperatures could boost mercury levels in fish by up to seven times the current rates, said Swedish researchers in an article published in Science Journal. They've discovered warming increases levels of the toxin (毒素) in sea creatures. In experiments, they found that extra rainfall drives up the amount of organic material flowing into the seas. This alters the food chain, adding another layer of complex organisms which boosts the concentrations of mercury up the line.

    Mercury is one of the world's most toxic metals, and according to the World Health Organization, is one of the top ten threats to public health. The substance at high levels has been linked to damage to the nervous system, paralysis and mental impairment in children.

    The most common form of exposure to mercury is by eating fish containing methylmercury(甲基水银), an organic form of the chemical which forms when bacteria react with mercury in water, soil or plants. Levels of mercury in the world's ecosystems have increased by between 200% and 500%, since the industrial revolution say experts, driven up by the use of fossil fuels such as coal.

    In recent years there have been concentrated efforts to limit the amount of mercury entering the environment, with an international treaty, called the Minamata Convention, signed by 136 countries in place since 2013.

Researchers hope that the Minamata treaty will be successful and countries reduce the amount of mercury that is being produced. Otherwise this discovery of a previously unknown source could have impacts for human health.

    Other researchers in the field say that the new study highlights important issues that have previously been little known.

     “This work experimentally proves that climate change will have a significant effect of methylmercury budgets in coastal waters and its accumulation in fish,” said Milena Horvat from the Jozef Stefan Institute in Slovenia.

     “This work will also help us understand the formation of mercury in fish and help reduce mercury from emission sources (primarily industrial).”

    Would it surprise you to learn that, like animals, trees communicate with each other and pass on their wealth to the next generation?

    UBC Professor Simard explains how trees are much more complex than most of us ever imagined. Although Charles Darwin thought that trees are competing for survival of the fittest, Simard shows just how wrong he was. In fact, the opposite is true: trees survive through their cooperation and support, passing around necessary nutrition “depending on who needs it”.

    Nitrogen (氮) and carbon are shared through miles of underground fungi (真菌) networks, making sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy. This hidden system works in a very similar way to the networks of neurons (神经元) in our brains, and when one tree is destroyed, it affects all.
     Simard talks about “mother trees”, usually the largest and oldest plants on which all other trees depend. She explains how dying trees pass on the wealth to the next generation, transporting important minerals to young trees so they may continue to grow. When humans cut down “mother trees” with no awareness of these highly complex “tree societies” or the networks on which they feed, we are reducing the chances of survival for the entire forest
   “We didn't take any notice of it.” Simard says sadly. “Dying trees move nutrition into the young trees before dying, but we never give them chance.” If we could put across the message to the forestry industry, we could make a huge difference towards our environmental protection efforts for the future.

    When I was young I wanted to be a model,so when a national contest was staged,I convinced my parents to have a try.I was selected and told that I was talented and that for only $900 I could attend a weekend event which dozens of the most famous modeling agencies from around the world would attend.At 13,my hopes of fame and fortune clouded all judgment and I begged my parents to let me go.We have never been rich,but they saw my enthusiasm and agreed.

    I imagined being signed by some famous model companies.For months,any boredom or disappointment I faced was pushed aside because I knew I would soon have the chance to be a real model.I thought I would grace the covers of famous magazines!

    Of course,I wasn't signed,but what hurt the most was being told that if I grew to about 1.75metres I could be a success.I prayed for a growth spurt（冲刺）because I could not imagine giving up my dream.I made an appointment with a local modeling agency and the agent demanded $500 for classes,$500 for a photo shoot,and $300 for other expenses.My parents only agreed after hours and hours of my begging.

    The agency sent me out on a few auditions,but with every clay I didn't receive a call,I grew more depressed.The final straw came in July after I had decided to focus on commercial modeling.There was an open call in New York City.We spent hours driving and another few hours waiting,only to be told that I was too short.I was depressed.

    Years later,I realized that the trip to New York was good as it made me notice I didn't actually love modeling, just the idea of it.I wanted to be special and I was innocently determined to reach an impossible goal.The experience has made me stronger and that will help me in the future.

    The story told to all American children about honesty is about the cherry tree that President George Washington cut when he was a boy. In China, every child knows the story of Lei Feng, the young soldier who helped others and was very honest. The stories of George Washington and Lei Feng help us understand the importance of being honest.

    Every teacher wants his or her students to be honest. If every student can be honest in their childhood, they will be honest when they become adults. The country will then be known as an honest country and it will be respected by everyone.

    Usually, it is the father and the mother who give the first lessons of honesty. George Washington learned honesty from his father.

    A favorite Chinese story is about a young man who went to the market to buy food for his mother. There was a very young girl there who was selling flowers. The young man stole one flower when the girl served her customer.

    When he went home, he began to think what he had done. He went back to the market to find the girl. He told her that he was sorry and that he wanted to pay her for the flower. The little girl refused and said, "You do not need to pay for the flower, elder brother. Since you took it, I thought you had a reason to take it so I did not worry about receiving money for it."The young man was ashamed that he stole the flower. He could never forget about the importance of being honest.

    My daughter had a bullying(欺凌) problem a couple of years ago. She kept receiving rude text messages from kids at school. Dealing with school bullying wasn't easy, but I finally ended it. When you realize things are serious, it is no time to be silent.

    If your kids are also receiving such text messages, take them directly to the headmaster and show him. Describe to him how it is affecting your kids. Tell him you will not tolerate it and that you want him to put an end to it now.

    School bullying is a dangerous and serious issue these days, and any good headmaster will take your charges seriously. He will probably address the issues with the parents. If they are crappy(糟糕的) parents, then they may do nothing to their child. You may have to repeat this process several times, but you need to keep a check on those text messages and don't allow your child to delete them.

    Now it is time to draw your child close and take care of him/her, because he/she needs it. My daughter did not like me being involved either, but you are the only person your kid can depend on to solve this problem, so do it and mean business. Always be polite, but straightforward. The headmaster and parents must know you mean business.

    If repeated meetings with the headmaster (and parents, if he allows it) do not work, then I would consider hiring a lawyer. That will send the message loud and clear. When you are talking about financial loss, most parents will stand up and take notice and act to keep their kids under control!

    I know a lawyer is a big expense and not something you do lightly, but when bad things like school bullying are happening to your children, you must act and act quickly.

My Favourite Books

    Jo Usmar is a writer for Cosmopolitan and co­author of the This Book Will series(系列)of lifestyle books. Here she picks her top reads.

Matilda

Roald Dahl

    I once wrote a paper on the influence of fairy tales on Roald Dahl's writing and it gave me a new appreciation for his strange and delightful words. Matilda's battles with her cruel me parents and the bossy headmistress, Miss Trunchbull, are equally fumy and frightening, but they're also aspirational.

After Dark

Haruki Murakami

    It's about two sisters­Eri, a model who either won't or can't stop sleeping, and Mari, a young student. In trying to connect to her sister. Mari starts changing her life and discovers a world of diverse "night people" who are hiding secrets.

Gone Girl

Gillian Fynn

    There was a bit of me that didn't want to love this when everyone else on the planet did but the horror story is brilliant. There's tension and anxiety from the beginning as Nick and Amy battle for your trust. It's a real whodunit and the frustration when you realize what's going on is horribly enjoyable

The Stand

Stephen King

    This is an excellent fantasy novel from one of the best storytellers around. After a serious flu outbreak wipes out 99.4% of the world's population, a battle unfolds between good and evil among those let. Randall Flagg is one of the scariest characters ever.