It has been around for centuries, but up until very recently, traditional Chinese medicine (TCM) wasn't fully accepted abroad. Proof of this can be found in The Treatment (《刮痧》), a 2001 film that tells the story of a Chinese man in the US who's accused of abuse after he uses guasha, a form of TCM treatment, to cure his grandson's disease.

    During the last 10 years or so, however, TCM has been getting increasingly popular all over the world. A report released by the State Council Information Office on Dec. 6 says this style of health care, which includes different forms like herbal medicine and exercise, has spread to 183 countries and regions.

    "We have set up 10 TCM centers outside China, and all of them are popular among locals," Wang Guoqiang, head of the State Administration of Traditional Chinese Medicine, said at a news conference on Dec 6. "Governments of 86 countries and regions have signed agreements with the Chinese government on TCM corporation."

    One of the reasons behind the growing popularity of TCM is the increase of scientific research into it. And after Tu Youyou, the Chinese scientist who discovered the anti-malaria (抗疟疾) drug qinghaosu (青蒿素), won the Nobel Prize in 2015, TCM became even more famous internationally.

    However, all these achievements in TCM don't mean that it's problem-free. Over the years, TCM has faced challenges in being able to prove that it has certain effects.

    Some researchers have suggested TCM should be more exact and work together with Western medicine.

    "Bringing together with Western medicine and TCM, rather than being in competition, is where the potential for great effects is," said Bernhard Schwartlander, the China representative of the World Health Organization.

    Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri (MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

    "To provide enough power, we need certain methods with high energy density (密度)", said Jae Kwon, assistant professor of electrical and computer engineering at MU. ''The radioisotope (放射性同位素) battery can provide power density that is much higher than chemical batteries."

    Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro systems (MNEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.

    "People hear the word 'nuclear' and think of something very dangerous." he said. "However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems."

    His new idea is not only in the battery's size, but also in its semiconductor (半导体). Kwon's battery uses a liquid semi conduct or rather than a solid semiconductor.

    "The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure (晶体结构) of the solid semiconductor." Kwon said, "By using a liquid semiconductor, we believe we can minimize that problem."

    Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery's power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

    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."

    Retired jet engines could help clear the smog that smothered big cities.

    To land at Indira Gandhi Airport is to descend from clear skies to brown ones. New Delhi's air is poisonous. According to the World Health Organization, India's capital has the most polluted atmosphere of all the world's big cities. The government is trying to introduce rules that will curb emissions-allowing private cars to be driven only on alternate days, for example, and enforcing better emissions standards for all vehicles.

    But implementing these ideas, even if that can be done successfully, will change things only slowly. A quick fix would help. And Moshe Alamaro, a researcher at the Massachusetts Institute of Technology, thinks he has one. His idea is to take a jet engine, put it next to one of India's dirty coal-fired power plants, point its exhaust nozzle at the sky and then switch it on. His hope is that the jet's exhaust will disrupt a meteorological phenomenon known as "inversion", in which a layer of warm air settles over cooler air, trapping it, and that the rising stream of exhaust will carry off the tiny particles of matter that smog is composed of. Inversion exacerbates air pollution in Delhi and in many other cities, from Los Angeles to Tehran. A particularly intense example caused the Great Smog of London in 1952, when four days of air pollution contributed to 12,000 deaths.

    Dr Alamaro thinks a jet engine could punch through the inversion layer to create a "virtual chimney" which would carry the trapped pollution above it, so that it could be dispersed in the wider atmosphere. He calculates that all the emissions from a gigawatt coal-fired power plant could be lifted away using a single engine with a nozzle speed of 460 metres a second.

    However, he has not calculated whether a jet engine could disrupt the inversion layer and allow the pollution to escape the city-so he is now going to test that hypothesis. Within eight months, Dr Alamaro plans to put one of his updrafters next to a coal-fired power plant and monitor what happens using a fleet of drones. He is in discussions with Tata Group, a conglomerate with an electricity-generating arm, to run it next to one of the firm's power stations.

It is almost five years since I begin to learn English.I'm glad to say I'm getting along good with it.But first I came across a lot of difficulties.I couldn't pronounce English words well,so could I remember the words I had learned.In class,I couldn't understand that the teacher had said.I almost lost heart when the teacher told me,"Keeping on,and you'll do well." I was great encouraged.I started working hard at English.Under the help of him and my classmates,I made some progresses.I'm very pleasing,and I will work harder.

Where does the meat on our table come from? It usually comes from livestock like chickens and cows. But did you know that meat can also be made in a lab? US company JUST has announced that lab-grown meat could be on some restaurant menus in the United States and Asia by the end of 2018, The Independent reported. 

"These meats include chicken nuggets (鸡块), sausage and foie gras (鹅肝酱), " Josh Tetrick, CEO of JUST, told The Independent. Lab meat is sometimes referred to as "clean meat". It is made using the stem cells (干细胞) of living livestock. The cells need to be grown in a lab for a few weeks. For example, making a hamburger patty (肉饼) takes about nine weeks, CNN reported. This is faster than raising a cow, which usually takes over 20 weeks. 

The first clean meat was a beef burger that was produced in 2013, but it was said to taste quite dry. How does clean meat taste now? Clean meat supporters told CNN that they think it tastes just like traditional meat. 

Clean meat has other advantages. It is healthier than traditional meat. Meat producers can control what type of fat goes into the meat. They can produce clean meat that contains healthy fats, such as omega-3 fatty acids (脂肪酸). This kind of fat is good for people's hearts. 

Clean meat can also help to solve global warming. According to The Washington Post, about 14. 5 percent of the planet's greenhouse gas emissions (排放) come from raising livestock. That's more than the emissions from every car, train, ship and airplane in the world combined. It is predicted that switching to clean meat could lower greenhouse gas emissions by 96 percent, The Independent reported.