People are compassionate. With effort, we can translate compassion into action. An experience last weekend showed me this is true. I work part-time in a supermarket across from a building for the elderly. These old people are our main customers, and it's not hard to lose patience over their slowness. But last Sunday, one aged gentleman appeared to teach me a valuable lesson. This untidy man walked up to my register (收款机) with a box of biscuits. He said he was out of cash, had just moved into his room, and had nothing in his cupboards. He asked if we could let him have the food on trust. He promised to repay me the next day.

    I couldn't help staring at him. I wondered what kind of person he had been ten or twenty years before, and what he would be like if luck had gone his way. I had a hurt in my heart for this kind of human soul, all alone in the world. I told him that I was sorry, but store rules didn't allow me to do so. I felt stupid and unkind saying this, but I valued my job.

    Just then, another man, standing behind the first, spoke up. If anything, he looked more pitiable. “Charge it to me,” was all he said.

    What I had been feeling was pity. Pity is soft and safe and easy. Compassion, on the other hand, is caring in action. I thanked the second man but told him that was not allowed either. Then I reached into my pocket and paid for the biscuits myself. I reached into my pocket because these two men had reached into my heart and taught me compassion.

    Learning to speak English well may be the best thing you can do to improve your life. That's right. If you can communicate in English, you can do the following things:

    Contact (联系) people from all over the world. Talk about your ideas and opinions on Internet discussion groups. Send e-mails to interesting people. Learn about their life and culture.

    Travel more easily. Communicate with people wherever you go—English is spoken in more than 100 countries. Ask directions, have a conversation, or ask for help. Maybe English will save your life some day!

    Push your career forward. If you want a good job in business, technology, or science, get out of that armchair and start learning English now! If you already have a good job, start learning before you lose it! Knowing English will let you do the following things:

    Put “excellent knowledge of English” on your CV (履历). Get your dream job, and earn more money.

    Gain technical knowledge. English is the language of technology, especially high technology like computer science, and medicine. If you're going to read about technology, you'll probably have to do it in English.

    Be a world-class businessman or woman. It's simple. International business is done in English. And all business today is international. So if you want to play, you have to know English—to contact other business people, go to conferences, and read international business newspapers and magazines, ect.

    Become a better scientist. Contact scientists from other countries, go to international conferences, and visit research centers abroad. Learn about new scientific discoveries by reading papers, books, and magazines.

    Use your computer more effectively. Most computer applications are in English, so you will understand them better—and become a better employee.

    Al was a skilled artist. One night, his older son developed a serious stomachache. Neither Al nor his wife took the condition seriously. But it was actually acute appendicitis (急性阑尾炎), and the boy died suddenly that night.

    Knowing the death could have been prevented if he had realized the seriousness of the situation, Al's emotional health became worse. Worse still, his wife left him a short time later, leaving him alone with his six-year-old younger son. The hurt and pain of the two situations were more than Al could handle, and he turned to alcohol (酒) to avoid the pain. Gradually Al became an alcoholic (酒鬼) and began to lose everything he had. Finally, Al died alone in a San Francisco motel room.

    When I heard of Al's death, I felt sorry for him. “What a complete failure!” I thought. “What a totally wasted life!”

    As time went by, I began to rethink my earlier judgment. I knew Al's son, Ernie, one of the kindest and most caring men I have ever known. I watched Ernie with his children and saw the free flow of love between them. I knew that kindness and caring had long come from somewhere.

    One day I worked up my courage to ask him. “I'm really puzzled by something,” I said. “I know your father was basically the only one to raise you. What did he do so that you became such a special person?”

    Ernie sat quietly and thought for a few moments. Then he said, “From my earliest memories as a child until I left home at 18, Al came into my room every night, gave me a kiss and said, 'I love you, son.'”

    What a fool I had been to judge Al as a failure. He had not left any material possessions (财产) behind. But he had been a kind loving father, and he left behind one of the finest, most giving men I have ever known.

    In recent years, a growing body of research has shown that our appetite and food intake are influenced by a large number of factors besides our biological need for energy, including our eating environment and our perception（感知）of the food in front of us.

    Studies have shown, for instance, that eating in front of the TV (or a similar distraction) can increase both hunger and the amount of food consumed. Even simple visual clues, like plate size and lighting, have been shown to affect portion size and consumption.

    A new study suggested that our short-term memory also may play a role in appetite. Several hours after a meal, people's hunger levels were predicted not by how much they'd eaten but rather by how much food they'd seen in front of them—in other words, how much they remembered eating.

    This disparity (新旧研究的差异）suggests the memory of our previous meal may have a bigger influence on our appetite than the actual size of the meal, says Jeffrey M. Brunstrom, a professor of experimental psychology at the University of Bristol.

    "Hunger isn't controlled individually by the physical characteristics of a recent meal. We have identified an independent role for memory for that meal," Brunstrom says. "This shows that the relationship between hunger and food intake is more complex than we thought."

    These findings echo earlier research that suggests our perception of food can sometimes trick our body's response to the food itself. In a 2011 study, for instance, people who drank the same 380-calorie milkshake on two separate occasions produced different levels of hunger-related hormones （荷尔蒙），depending on whether the shake's label said it contained 620 or 140 calories. Moreover, the participants reported feeling more full when they thought they'd consumed a higher-calorie shake.

    What does this mean for our eating habits? Although it hardly seems practical to trick ourselves into eating less, the new findings do highlight the benefits of focusing on our food and avoiding TV and multitasking while eating.

    The so-called mindful-eating strategies can fight distractions and help us control our appetite, Brunstrom says.

    A year ago, my friend and I went to a nearby town to attend a wedding. After the reception, we were waiting for a public transport bus to go back home. It was nine o'clock at night, and although many buses passed, none stopped.

    We waited for an hour and were getting forlorn. We wouldn't be able to stay overnight because it was weekday, and we both needed to work the next day. It was almost 10 p.m. when a family who had attended the same wedding passed by in their car. Probably sensing that we were waiting for some means of transport, they stopped and gave us a lift.

    I was so touched by their kindness, and I expressed my thanks to them. When we reached my hometown, the family dropped us at the nearest point from where we could catch a shared taxi to get back to the spot where we had parked our bike. On the way, a laborer stopped the taxi. The driver saw his clothes and asked him whether he had money to pay the fare.

    The laborer shook his head and said, "No." On hearing this, the driver refused to take him. I remembered my own dilemma a few minutes earlier, and I told the driver to allow him to sit with us, as I would pay his fare. What an immediate opportunity to pass on the family's act of kindness!

    That night, I felt lightness in my heart, and I went to sleep happily and filled with joy about what I had gotten to do. How I wish this chain of kindness could continue all over the world with your help! That is why today I specially share my story with you again!

When it comes to sitting properly, we all know the correct way even if we don't do it to the letter. No crossed legs, bottoms touching the back of the chair and feet on the ground. But even if you're doing it right, sitting for long periods is shockingly bad for you. It has been described as the new smoking, linked to heart disease and even cancer. There is no doubt we should all try to do less of it. But perhaps we could also do it better.

A classic survey, published in 1953, described 100 different sitting postures adopted by 480 cultures around the world. Among the most common were sitting cross-legged, kneeling and the deep squat (深蹲), with feet flat on the ground and bottoms resting on or just above it. Even in Western cultures, these are preferred sitting positions among young children. But Westerners tend to prefer chair use from an early age, insisting children sit on seats in school.

One big problem with this desire for chairs is that they make sitting so, well, sedentary (久坐不动的). Consider the Hadza, a group of hunter-gatherer people in Tanzania. They spend around 9 hours a day sitting. However, they squat and sit on the ground in various positions, and this involves high levels of muscle activity. The supportive nature of chairs, with their high backs and armrests, removes this effort perhaps the reason that people love them.

So what's the best way to sit? Josette Bettany-SaItikov at Teesside University, UK has found that kneeling can help keep the spine in a better position as does squatting. We might also take inspiration from traditional cultures like the Hadza. "Use a variety of postures and preferably not just still postures but some which allow movement," says Bettany-Saltikov.

Bettany-Saltikov believes that we should be rethinking what it means to do a desk job. "We still need to design workplaces that enable people to be productive while being lightly active, like with under-table cycling or walking desks," she says. For now, if your job is sedentary, don't forget to stand up regularly and move around.