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    Have you ever wondered why the roots of the plants always know which way to grow—into the soil but not above it? Some British scientists have recently solved this mystery.    

      It turns out that roots have special hairs that tie them into the soil and help them grow their way past obstacles, a team at the John Inners Center in Norwich reports in the February 29 issue of Journal Science.

    "The key is in the fuzzy(有绒毛的) coat of hairs on the roots of plants," says professor Liam Dolan. "We have found a growth control system that enables these hairs to find their way and to become longer when their path is clear."

    Root hairs explore the soil in much the same way a person would feel their way in the dark. If they come across an obstacle, they make their way around until they can continue growing in an opening. I the meantime, the plant is held in place as the hairs grip the soil.

    The hairs are guided by a clever chemical trick. A protein(蛋白质) at the tip of the root hairs called RHD2 helps them to take calcium(钙) from the soil. Calcium makes the hairs grow, and produce more RHD2, and take more calcium.

    But when an obstacle blocks the hair's path, or the hair reaches the surface of the soil, the cycle is broken and growth starts in another direction.

    This system gives plants the flexibility to explore a complex environment and to live in even the most unpromising soils, says Dolan.

    In poor soils such as in parts of Australia and Africa, native plants have adapted by producing enormous numbers of root hairs. A better understanding of this adaptation will allow scientists to develop hairy rooted crops that can grow in unfriendly environments.

    According to Dolan, "Research in the John Inners Center is taking a breeding approach(育种方法) to increase hair length in wheat but it will be some time before new cultivars(栽培变种) are developed."

    1990 was an important year in world events. In February, Nelson Mandela was set free after 27 years in prison. In October, East and West Germany became one country again. Then at the end of 1990, the World Wide Web was born. For this final event we have one man to thank. Tim Berners-Lee, the father of the Web.

    Berners-Lee was born on June 8, 1955 in London, England. His parents, both computer designers, encouraged him to think and work creatively as he grew up. He was an excellent student and naturally took an interest in computers and science.

    After graduating from Oxford University, Tim went to work at a science research centre in Switzerland. There he developed some of the different systems（系统）that would later become the Web. The first was HTML, the computer language used to make web pages. The second was an address system that let computers anywhere find each other and send and receive information. In 1990 he put them together to make the first Internet browser（浏览器）.

    Tim knew that the more people used the Web, the more useful it would be. He wasn't interested in money but knowledge, so he gave out his invention for free to anyone who was interested. Many were interested an the growth of the Internet began.

    Today Tim works as a professor at the MIT in America, studying new ways to use the Web. He has received many awards from governments and organizations for his efforts. He is still not very interested in money. That is why he is so liked by his students and workmates. It may also be one of the reasons that few people outside the world of technology know his name.

The story of the movie Inside Out mostly takes place inside the mind of 11-year-old Riley as she moves from Minnesota to San Francisco. The main characters are Riley's emotions—Joy, Sadness, Disgust, Anger and Fear, which guide her decisions and often compete with one another for control of her brain.

    Fear is tall, thin, looks like a frayed(焦燥的)nerve and is purple. Not only that, his eyes are purple, too. Anger, which is red, looks like a brick and has red eyes. Disgust, who is green, has green eyes. Sadness, not surprisingly, is completely blue, and even looks like a teardrop. But Joy, who is mainly yellow, has more than one color in her. She has blue eyes and blue hair. Why? Well, if blue represents sadness, then the message is clear: there is no such ting as “pure joy”. Instead, even in our most joyous times, there is often sadness mixed in.

    After all, one of the most joyous moments we can experience is a wedding, but it may end with the breaking of a glass. It reminds us that our world is still broken. In order words, even at our highest moments, there is always a little sadness.

    But the comfort is that the reverse is often true. Think about how you feel after crying. When you cry, your body is releasing some chemicals that often make you feel good. And that's why you feel at ease after a good cry.

    Indeed, Inside Out reminds us that even the emotions that appear “negative' have value. In other words, Inside Out shows us that the goal of life isn't “to be happy”. We will feel sad, angry or frightened. But we need our whole range of emotions for developing our sense of self and our relationship with others.

    If you want to convince the boss you deserve a pay rise or promotion, the solution could be simple—eat the same food as they do.Psychologists have discovered managers are much more likely to instantly trust us if we choose the same dishes as them.

    During experiments, discussions over wages and work conditions were much more successful if both sides chose to snack on the same treats.And shoppers were much more likely to buy a product advertised on TV by someone eating a similar food to them at the time.

    The reason is thought to be so­called similarity attraction theory—where people tend to like others who have similar tastes or habits to themselves.But this is believed to be one of the first studies highlighting the role of food in this relationship.Researchers at Chicago University in the US conducted a series of experiments to examine food's role in earning trust.

    In a test, participants were told to watch TV—where someone pretending to be a member of the public praised a certain product.The volunteers were given Kit Kat bars to nibble, while the TV people ate either a Kit Kat or grapes as they talked.

    The results showed viewers were much more likely to express an interest in buying the product if the TV showed the other person eating a Kit Kat too.

    The researchers added, “Although similarity in food consumption is not a sign of whether two people will get along, we find consumers treat this as such.They feel more trusting of those who consume as they do.It means people can immediately begin to feel friendship and develop a bond, leading to smoother transactions from the start.”

    Harley Street psychologist Dr.Lucy Atcheson said it was already known that wearing similar clothes could instantly create trust.But this was the first report that food had the same effect.She said, “This is really interesting.It makes sense as people feel they have common ground and can trust the other person.That means negotiations are more likely to be successful.”

    A new study by Chinese researchers has found differences in the brain activity of men and women addicted(上瘾的)to Internet gaming.

    The study says addicted men have lower impulse control compared with women, indicating that men are more likely to become addicted to internet gaming.

    Researchers from Renji Hospital, which is connected with Shanghai Jiaotong University, recruited 105 Chinese participants for the study, which had two groups - one with 32 men and 23 women addicted to gaming, and the other with 30 men and 22 women who were not addicted.

    They completed a questionnaire for gaming addiction, and reported their gaming history and number of hours playing per week. Researchers also talked with their families to collect the information.

    Through FMRI (磁共振扫描), researchers found that men addicted to gaming had lower brain activity in the brain region associated with impulse control, than nonaddicted men. The lower the activity levels, the poorer the impulse control. Addicted women, however, showed no differences compared with the healthy female group.

    Researchers also studied the functional connectivity between brain regions, which were lower in men with addiction than in nonaddicted men, but showed no differences in the female groups.

    Although there are some limitations, the findings suggest that activity levels displayed in the brain region could be biomarkers to evaluate the behavioral inhibitions of gaming-addicted men, they said.

    Gaming disorder was listed as a mental disorder by the World Health Organization earlier this year. People with the disorder have impaired control over gaming and give it increased priority in their lives－to the extent that gaming takes precedence over other life interests and daily activities.

Growing up, I understood one thing about my dad: He knew everything. In my teen years, he taught me things I'd need to know to survive in the real world. How to drive a stick shift. How to check your car tyre's pressure. The correct knife to use to cut a cantaloupe.

When I moved out on my own, I called him at least once a week, usually when something broke in my apartment and I needed to know how to fix it: the toilet, the air-conditioning, the wall, once, when I threw a shoe at a terrifying spider.

But then, eventually, I needed him less. I got married, and my husband had most of the knowledge I lacked about gutter cleaning and water heaters and nondestructive insect removal. For everything else, we had Google. I don't know when it happened, but our conversations when I called turn into six words. Me: "Hi, Dad." Him: "Hi, sweets. Here's Mom."

I loved my dad, of course, but I wondered at times if maybe he had already shared everything I needed to know. Maybe I'd heard all his stories. Maybe, after knowing a man for 40 years, there's nothing left to say. Then, two summers ago, my husband, our four kids and I moved in with my parents for three weeks while our house was being painted. They owned a lake house, and my dad asked me to help him rebuild the bulkhead （舱壁）. It was hard, manual job. We got wet and sandy. But as we put the new bulkhead together piece by piece, my dad knew exactly what went where, I looked at him. "How do you know how to build a bulkhead?" "I spent a summer in college building them on the Jersey Shore.

"You did?" I thought I knew everything about my dad, but I never knew this. I realized that maybe it's not that there's nothing left to say. Maybe it's just that I've spent my life asking him the wrong questions. That day, my dad talked about what he had learned and what he could do excitedly. We chatted and chatted for a long time.

A few weeks later, after my family and I moved back into our painted house, I called my parents. "Hi, sweets," he said. "Here's Mom." "Wait, Dad," I said. "How are you?" We ended up talking about everything he was working on. To anyone else, it would sound like a normal conversation between a dad and his daughter. But to me, it was novel. A new beginning. I spent the first part of my life needing to talk to my dad. Now I talk to him because I want to.