While it may be unlikely for a computer to write a best seller, a technology expert has created a computer program that writes its own fiction stories with minimal user input. The program, called MEXICA, is the first to generate original stories based on computerized representations of emotions and tensions between characters.

    An Internet survey was carried out to see the popularity of the computer-generated stories, other computerized stories and stories written solely by a human. The result was that readers ranked MEXICA stories highest for flow and coherence, structure, content, suspense and overall quality. Rafael Pérezy Pérez, the creator of MEXICA, explained that a story might begin with something as basic as, “The enemy wounded the knight. The princess cured the knight. The knight killed the enemy. The knight rewarded the princess. The end.”

    The program reads characters as variables (变量) and assigns a numerical value, between a continuum (连续体) from -3 to +3, to emotional connections that are defined as either amorous or non-amorous. The numerical value is equivalent to the degree of emotion, with -3 being intense hate and +3 being intense love. The program also understands story tension, such as linking the word “wounded” with tension. This too is assigned a numerical value.

    Once these clusters of emotional links and tensions are established, the program begins what is called an “engagement reflection cycle”. Basically this involves searching a database of story actions and other happenings, which are called “atoms”, and determines the best match for the characters and contexts for that moment.

    The process repeats itself again and again until the system can no longer make any matches. At this point, the computer analyzes the story for coherence and “interestingness”. The program views a story as interesting when tension levels increase and fall throughout the piece. If the program finds that the story is boring or incoherent in places, it will replace or insert atoms until a version is thought to be satisfactory.

    Here comes a story that many years ago a man arrived at a village in India to catch monkeys so he could sell them to zoos. The monkeys, however, were very clever and every sort of trap he set failed. A young boy watched the man's pathetic efforts and laughed.

    The man said, “If you can catch me a monkey, I'll give you $ 2.” That was a huge amount of money then.

    The boy went to his home and took a clay pot with a narrow neck. He placed a few nuts around the pot and put lots of nuts inside. He then tied the pot to a tree and told the man, “We should have a rest in a few hours. Let's wait in the village. The monkey will call us when he is ready.”

    Certainly enough, a band of monkeys soon discovered the nuts and the pot. One slipped his hand in the pot and grabbed a handful of nuts, but he couldn't pull his hand out of the narrow opening of the pot because his fist(拳头) was clenched. The monkey feared and started making loud noises. Some of the other monkeys tried unsuccessfully to pull the pot off his hand.

    The boy and the man heard the noises and the boy got a big strong bag. As they approached the monkeys they all ran away except the one with its hand in the pot. The boy grabbed the monkey and the pot. The man was amazed and asked the boy the secret of his monkey trap, “Why was it so easy for the monkey to get his hand in but so hard to get it out?”

    The boy laughed and said, “The monkey could have easily got his hand back out and escaped, but he would have had to let go of the nuts in the pot and he just wasn't willing to let go. They never are.”

    What lessons can be learned from this story? Do people sometimes trap themselves by holding onto things that they should let go? Do you?

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    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 co-operation 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.

    If English means endless new words, difficult grammar and sometimes strange pronunciation, you are wrong. Haven't you noticed that you have become smarter since you started to learn a language? According to a new study by a British university, learning a second language can lead to an increase in your brain power. Researchers found that learning other languages changes grey matter. This is the area of the brain which processes information. It is similar to the way that exercise builds muscles.

    The study also found the effect is greater when the younger people learn a second language. A team led by Dr. Andrea Mechelli, from University College London, took a group of Britons who only spoke English. They were compared with a group of “early bilinguals” who had learnt a second language before the age of five, as well as a number of later learners.

    Scans showed that grey matter density (密度) in the brain was greater in bilinguals than in people without a second language. But the longer a person waited before mastering a new language, the smaller the difference.

    “Our findings suggest that the structure of the brain is changed by the experience of learning a second language,” said the scientists. It means that the change itself increases the ability to learn. Professor Dylan Vaughan Jones of the University of Wales, has researched the link between bilingualism and math skills. “Having two languages gives you two windows on the world and makes the brain more flexible (灵活的),” he said. “You are actually going beyond language and have a better understanding of different ideas.”

    The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of two and thirty-four. Reading, writing, and comprehension were all tested. The results showed that the younger they started to learn, the better. “Studying a language means you get an entrance to another world,” explained the scientists.

Dear Graham,

    My partner and I have recently lost a pet quite suddenly. Normal life is continuing with so much sadness for my pet meant so much to me. Lots of people won't understand my feeling this way about the death of an animal. This obviously isn't the first time someone in my life has passed away: when I was younger we lost elderly relatives who I loved very much, and naturally much-loved family pets died occasionally too. But this has hit me so much harder. I put so much love into the relationship and I'm just finding it hard to get my head around the fact that it's gone.

    Thank you for taking the time to read this.

ANON, VIA EMAIL

Dear Anon,

    Something you loved deeply has gone from your life, so of course you are sad. We love our pets differently from family members or friends and part of that is because we know they will probably die before us. Our time with our dogs or cats is precious precisely because we understand it is limited.

    As humans, we go through most of life understanding we would die one day. But animals don't. We are the keeper of the secret. Of course, living a life unencumbered(不受妨碍) by thoughts of death means that our pets, in general, lead very simple, happy lives. It's one of the reasons why they are such a joy to be round. You are, of course, correct when you say that many people don't understand your grief, so don't talk to them. Share your feelings with like-minded souls. I'm sure a simple search online will reveal many practical advice for moving on.

    And when you are ready, you can welcome another animal into your life and then you will enjoy happiness again.

GRAHAM, VIA EMAIL

    Homebuyers nationwide are watching housing prices go up, up, and up. "How high can they go?" is the question on everyone's lips.

    It's crazy, "said Tim, who is looking for a house near the beach. "In 1993, I bought a two-bedroom house in Venice for $70，000. My friends thought then that I was overpaying. Five years later, I had to move. I sold it for $230，000, which was a nice profit. Last year, the exact same house was for sale for S510, 000!

    It is a seller's market. Homebuyers feel like they have to offer at least 10% more than the asking price. Donna, a new owner of a one-bedroom house in Venice Beach, said, "That's what I did. I told the owner that whatever anyone offers you, I'll give you $20,000 more, under the table, so you don't have to pay your realtor(房地产经纪人) any of it. I was tired of looking.”

    Tim said, "Whether you decide to buy or decide not to buy, you still feel like you made the wrong decision. If you buy, you feel like you overpaid. If you don't buy, you want to kick yourself for passing up a great opportunity.”

    Everyone says the bubble has to burst sometime, but everyone hopes it will burst the day after they sell their house. Even government officials have no idea what the future will bring. "All we can say is that, inevitably, these things go in cycles," said the state director of housing. "What goes up must come down But, as we all know, housing prices always stay up a little higher than they go down. So you can't lose over the long run. Twenty years down the road, your house is always worth more than you paid for it.”