When my students ask me why I live in a tiny house, they ask it in light of all the “sacrifices(牺牲)”I an making. They know that I have moved from a large apartment in the city to a small custom-built home on wheels in the backyard woods. They know I forego running water, Internet connection, sewage(下水道), and reliable phone reception.

    However, it was possible for me to be truly happy while living with very few material things. My body responded well, in health, fitness and mood, to a schedule more consistent(一致的)with the natural day and night cycle. Observing the daily sunset, hosting friends for days at a time, reading, writing letters to my families and friends and exploring natural wonders in my spare time all were free and invaluable experiences.

    What was necessary to my survival proved to be a rather short list-healthy food, clean and drinkable water, heat source, weather-protecting shelter, weather-suitable clothing, equally important friends and mental and physical stimulations(刺激).

    When I returned to life in the US, I couldn't help but sense a deep and uneasy belief that life suddenly changed. I felt disconnected with many things- the earth, others, my food source, my waste disposal, the natural cycle of my body and the productive interests. These are the things I once cared for but now find myself too busy to enjoy. How was it that I was earning literally 40 times my Peace Corps salary and was less healthy, satisfied and intentional in my daily schedule? I found myself asking-what is it to be rich anyway? Therefore, last August I let go of most of my possessions and moved into a tiny house on wheels because I wanted to see if I could live a more enjoyable lifestyle. So far so good. No inconvenience has made up for the many positive benefits that continue to come from this change in lifestyle. I believe that I have made the right decision.

    One day, when I was working as a psychologist（心理学家）in England, an adolescent boy showed up in my office. It was David. He kept walking up and down restlessly, his face pale, and his hands shaking slightly. His head teacher had referred him to me. “This boy has lost his family,” he wrote. “He is understandably very sad and refuses to talk to others, and I'm very worried about him. Can you help?”

    I looked at David and showed him to a chair. How could I help him? There are problems psychology doesn't have the answer to, and which no words can describe. Sometimes the best thing one can do is to listen openly and sympathetically（同情）

The first two times we met, David didn't say a word. He sat there, only looking up to look at the children's drawings on the wall behind me. I suggested we play a game of chess. He nodded. After that he played chess with me every Wednesday afternoon—in complete silence and without looking at me. It's not easy to cheat in chess, but I admit I made sure David won once or twice.

    Usually, he arrived earlier than agreed, took the chess board and pieces from the shelf and began setting them up before I even got a chance to sit down. It seemed as if he enjoyed my company（陪伴）. But why did he never look at me?

    “Perhaps he simply needs someone to share his pain with,” I thought. “Perhaps he senses that I respect his suffering.” Some months later, when we were playing chess, he looked up at me suddenly.

    “It's your turn,” he said.

    After that day, David started talking. He got friends in school and joined a bicycle club. He wrote to me a few times, about his biking with some friends, and about his plan to get into university. Now he had really started to live his own life.

Maybe I gave David something. But I also learned that one…without any words—can reach out to another person. All it takes is a hug, a shoulder to cry on, a friendly touch, and an ear that listens.

    Nations in the UN have agreed that the world needs to completely stop plastic waste from entering the oceans. The UN resolution(决议) has no timetable. But ministers at an environment summit believe it will set the course for much tougher policies and send a clear signal to business.

    Under the resolution, governments would establish an international task force(特遣小组) to advise on fighting what the UN's oceans chief has described as a world crisis. One controversial issue is the wish to include businesses on the global task force. Ministers say the problem will not be solved without business, but green groups point out that some firms in the plastics industry have been against restrictions for decades. Vidar Helgesen, a leading voice in the talks, told BBC News, “Business is listening to markets and seeing how marine litter(海洋垃圾) is a growing popular concern. It's possibly the fastest－growing environmental problem and it's therefore a fast－growing problem for business. We need to bring on board those companies that want to change things, and then look at taxes and regulations to make more companies act.”

    Certainly, there has been resistance from plastics firms to the bans. One UN delegate, who did not want to be named, stated that journalists in some countries were being paid by the plastics industry to write stories about job losses following the plastic bag ban. But they did not mention the jobs being created in alternatives, such as labour－intensive basketwork, which provides work for the rural poor. But some governments are standing firm, and the meeting has witnessed individual nations declaring tougher action against single－use plastic bags.

    The UN's spokesman Sam Barratt told BBC News, “Of course we would have liked to have gone further, but this meeting's made real progress. There's now a sense of urgency and energy behind the issue that we haven't quite seen before. What is obvious, though, is that the UN can't solve this problem on its own. We need to do it in partnership with governments, businesses and even individuals.”

    How would you like an easy way to earn $2,500? All you have to do is to sit around and wait for your meals. There's a catch, however. You have to stay in a chicken cage with a stranger for a whole week. There are no books or television or radio for a whole week. There are no books or television or radio for amusement. You can't leave until the week is up. And a camera will be recording your every move.

    Two people actually took the job. The idea came from Rob Thompson, a video artist. He wanted to make a film about the way animals are treated. His goal was to raise people's awareness of the living conditions of animals that are raised for food. He decided to pay $5,000 out of his own savings to two people who were willing to live like chickens for a week.

    To Rob's surprise, quite a few people answered his advertisement. He had interviews and selected Eric, a 24-year-old restaurant worker, and Pam, a 27-year-old chemist. The plan was for them to spend seven days together in a chicken cage that was six feet long and three feet wide. A camera would record their experience, which would take place in an art museum.

    The week was long and difficult. They slept on a hard wooden floor. They couldn't stand up without banging their heads. They ate mash(a kind of food for animals) and drink water from a garden hose-pipe(软管). Their only privacy was a toilet surrounded by a curtain. There were no sinks, mirrors, or toothbrushes in the cage. Their only inspiration was the two framed checks that hung on the wall outside the cage. Visitors who came here were warned, “Do not feed the humans.”

    Finally it was over, and Pam and Eric came out of the cage. They had survived the week, and they each had a $2,500 check in their hands. When Rob Thompson opened the cage, Eric came out, changed into clean clothes, and ate a chocolate bar right away. “It's great for me to be able to stand up.” he said. Pam just changed her clothes and left. After a week of visitors and reporters watching her, she didn't want to talk to anyone.

    Some jobs are so demanding that there is not a free moment to do something else than to recover and rest. Most physicians have great difficulty starting or even maintaining a hobby. But there are exceptions.

    Take Menno Baars for instance. He works full time as a cardiologist(心脏病专家)in a hospital in Holland. "Full time" might still be an understatement-as a cardiologist he spends about 60 hours a week in the hospital. However, after a long day of work, he likes to come home and spend hours doing what is his great passion: painting.

    How can he find the time and energy to live a life that few others can pursue?" "Actually it is quite simple. If you like what you do, you will find a way to do it. Don't get me wrong. I love cardiology, but it is not a very creative profession," says Baars."It is a specialty that is based on strict treatment guidelines, without much room for your own ideas and creativity. That is why painting as a hobby is so wonderful. There are no rules and I can do whatever I want."

    Although there are no rules in painting, for Baars it is still some sort of a custom. The only thing that reminds the painter Baars of the cardiologist Baars is his white coat and his surgical gloves which he wears every time he is painting." I sometimes start at 10 at night and can continue working until 4:30 in the morning and still make it to work on time that same day," says Baars."That is the advantage of my training as a medical specialist. I get used to making crazy hours and long nights."

    You would think that someone who is so driven by his passion for painting was already fascinated by art as a little kid." Not at all," says Baars unexpectedly." I never dreamed of becoming a painter. My parents expected me to finish college and pursue a professional career. I only realized my passion for painting after having completed medical school. Once I was attracted by a painting of Miro, but could not afford it. So I decided to paint myself. I just started painting lines, but within minutes a beautiful dove was on the canvas. I suddenly realized this is what I want to do."

    A successful doctor. A successful painter. It seems unfair to have the two identities in one person. What do his fellow cardiologists think of his passion for painting? "They accept it and actually appreciate it as well. You see, if I was a cardiologist who provided suboptimal(未达最佳标准的)care for his patients，they would not agree. My chairman told me a few years ago in the hospital that he would rather see me reading cardiology books at night than see me holding a paint brush."

    "I used to pack a lot of ideas into each painting-different shapes，colors and so on. I still have tons of ideas, which is not the problem. But I do strive for more simplicity. To depict a simple idea clearly is my goal. Also my technique has improved over time. When I started out, the paint would sometimes flake(剥落)if the basis was not good, but that doesn't happen anymore these days."

    Menno Baars never has any doubts when he is painting. However，he does like the response he gets from the most important woman in his life. His wife is the first to see each newly-finished painting." Sometimes when I finish a new painting in the middle of the night, I wake her up to see if she likes it. She doesn't always like to be woken up, but she always gives an honest answer.

    Even if she doesn't like it, for me the painting is finished. I won't change it afterwards. It is more of the feeling that once my wife has seen it, it is ready to be presented to the rest of the world."

    In San Francisco, where the number of the homeless has risen by 7% in the last decade, a non-profit organization is putting bathrooms on wheels and driving them to those in need. The group, Lava Mae, is improving retiring city buses and bringing them into different neighborhoods, currently providing about 200 showers each week.

    Doniece Sandoval, the founder of Lava Mae, first became interested in the issue in 2012, when she passed a young woman under an overpass near the San Francisco Design Center who was repeating to herself that she'd never get clean. "It made me wonder what her chances were," said Sandoval, who was then inspired to research exactly how many public shower stalls（淋浴间）existed in the city. Her findings were disheartening.

    So Lava Mae came together when she heard the city would be retiring cold city buses. "I told myself, I want those buses!" she said.

    Each bus has two private bathrooms, one of which is wheelchair accessible. Along with the basic shower, sink and toilet, the spaces have soft lighting, digital controls for water, and hair dryers.

    "Though you're only going to be on the bus for 20 minutes or so, it's 20 minutes of complete privacy," Said Sandoval.

    The buses are parked near agencies that already serve the homeless. "If we can reduce the amount of time people have to run from place to place to get essential services, we'll be able to make things better," said Sandova.

    What's next for lava Mae? The group is starting a program so that others can mimic their process. " What we're hoping to do is to get people to follow what we do, so they can recreate it." she said.