Try this: For an entire day, forget about the clock. Eat when you're hungry and sleep when you're tired. What do you think will happen?

    You may be surprised to find that your day is much like most other days. You'll probably get hungry when you normally eat and tired when you normally sleep. Even though you don't know what time it is, your body does.

    These patterns of daily life are called circadian rhythms（生理节奏）, and they are more than just habits. Inside our bodies are several clocklike systems that follow a roughly 24-hour cycle. Throughout the day and night, our inner clocks direct changes in temperature, body chemicals, hunger, sleepiness and more.

    Everyone's rhythms are different, which is why you might like to stay up late while your sister always wants to go to bed early. But on the whole, everyone is programmed to fell tired at night and energetic during the day.

    Learning about our body clocks may help scientists understand why problems arise when we act out of step with our circadian rhythms. For example, traveling across time zones can make people wake up in the middle of the night. Regularly staying up late can make kids do worse in tests.

    "There is a growing sense that when we eat and when we sleep are important parts of how healthy we are," says Steven Shea, director of the Sleep Disorders Program at Brigham and Women's Hospital in Boston.

    One way to learn about how our body clocks tick is to mess them up and see what happens. That's what neurologist（神经病学家）Frank Scheer and his workmates did in a recent study.

    Staying up night after night, their studies suggest, could make kids extra hungry and more likely to gain weight. And regularly sleeping too little, Scheer says, may be one cause of the recent increase in childhood obesity.

    Did you know that something as simple as the wallpaper on your computer can tell people a lot about you? According to researcher Donna Dawson,our computers say something about what we're like because they are part of our “personal space.”

    A picture of a child or family on the screen often means the person cares deeply about their loved ones.A photo of the person surrounded by friends shows they value their popularity and probably work well with other people.On the other hand,pictures showing examples of past successes,like winning a prize may mean a person is only interested in themselves.

    Pictures of nature and natural scenery tell people that you are driven to succeed and use the pictures to relax and remove the pressure（压力）in your life.Cityscapes,pictures of cities or towns,show that you enjoy travel and adventure.Most people with cityscapes as their wallpaper are optimistic（乐观的）,happy people who feel even better thinking about the places they've visited or want to visit.

    Pictures of animals show that you are optimistic and kind-hearted.You are often happy and you enjoy life and act young.Cartoons（漫画）or drawings show that you are a multitasker,someone who does many things at once.You have many responsibilities,but you deal with them well.That's one reason you like having something to smile about when you look at your computer wallpaper.

    Then,what does plain blue wallpaper tell us about a person?According to Dawson,a person with plain blue wallpaper probably values their privacy and keeps work from becoming too personal,

    The annual World Economic Forum (经济论坛) took place in Davos, Switzerland, in Jan 23 -26, 2018. What did Chinese entrepreneurs (企业家) speak in the forum? Are there some quotable quotes for you?

    Jack Ma, founder and executive chairman of Alibaba Group

“I think globalization cannot be stopped — no one can stop globalization, no one can stop trade. If trade stops, the world stops. Trade is the way to dissolve the war not cause the war,”said Ma in Davos, “Google, Facebook, Amazon and Alibaba we are the luckiest companies of this century. But we have the responsibility to have a good heart, and do something good.”

    Richard Liu, founder and chief executive officer of JD

    “Business is not only a way to make money but also a way to contribute yourself, to help people,” Liu said in a speech in Davos.”How can we face the fractured (分化的) world? That's the topics of the Davos this year. I think a very important thing in business is cooperation. If we can unite, work together, (if) we work very closely, I think we can bring more hope to the people and we can build more trust between the people, countries and companies and partners,” he said.

    Jane Sun, CEO of Ctrip

    “Tourism is a sunrise industry. Since I entered Ctrip, every year there are new comers, which, first of all, shows that tourism is booming.” Sun told Sina.com in Davos. “We invested heavily in ABC. A refers to AI, B is big data, and C is cloud computing. As we continue to expand overseas, these three will be very good weapons for us. So we think those mean opportunity,” she said.

    Hu Xiaoming, president of Aliyun

    “In 2018, people will see the development in various countries more closely connected with cloud computing. More manufacturing enterprises and financial institutions will start to use 'cloud', and cloud computing will increase the efficiency of technology and finance,” Hu told Xinhua in Davos.

    In the early hours of the morning, Gary Miller was in his truck, traveling down the road alone to deliver. Everything seemed calm. But with the sound of a fire siren (警笛) cutting through the wind, he became alarmed. Miller, a trucker by trade, has been a volunteer firefighter for 40 years. That loud, sharp siren assured him that help was on the way.

    Most people never realize that this help is often a crew of volunteer firefighters. They make up 70 percent of the country's nearly 1.2 million firefighters. "When I was a teenager there would be many who responded. About 20 people were coming into the voluntary fire station at one siren." Miller laughed. But now, at his 54, that memory is almost ironic (讽刺的)to him. When a call comes in, his station might get only three or four people responding. He said: "People don't want to, or rather, they don't have time to volunteer." Adults' burdens have become greater. There isn't as much time left for volunteering when most people rely on a two-income household now more than ever.

    Firefighters face far more than what we imagine. The emotional stress on a firefighter stands out. "We're asked to help someone at their most vulnerable (易受伤的) time. But we can't always save the day like we hope to." Miller reflected on the case years ago. "A mother's car was hit hard, and she had two children in the backseat." By the time he arrived on the scene, there wasn't much to be done. "One child died in my arms and I felt so defeated."

    Along with the emotional stress, the physical danger is just as great. Even with the progress of equipment and new training, that's still not always enough to save a firefighter's life. In 2016, 60 firefighters died in the line of the duty. "When you respond, you never know if it is to be your last," Miller said. "And that's just a risk we take." Miller continued. "It's dangerous. But it's also the most rewarding thing I've ever done."

    Sila Sutharat, a roasted chicken street vendor from Phetchaburi, Thailand, has come up with a unique way of cooking chicken. He uses 1, 000 mobile mirrors that concentrate sunlight into a strong beam(光束).

    Like most other street vendors, Sila used to cook his chicken over a charcoal(木炭)fire. But that all changed in 1997, when an ordinary observation gave him a great idea. One day, he was hit by the sunlight reflected off the window of a passing bus, and he felt its heat. "I could possibly change it into energy," Sila told himself. Then he started working on how to make use of the sunlight to cook his chicken.

    "They said that I'd gone mad, and that cooking chicken like this was impossible," Sila told reporters about how people reacted to his idea. But he didn't let their jokes get to him, and in the end he was the one who had the last laugh. He invented a panel featuring 1, 000 small mirrors that could be moved. It worked exactly as he predicted, allowing him to cook a 1.5 kg chicken in just 10 to 15 minutes. "After a long time passed by, they'd say: "Actually, you could do it," " Sila Sutharat recalls. Sila says that his invention can make the temperature go up to 312'C. This is why he always wears a special mask instead of a cook's hat when operating it.

    Sila's solar roaster is an unusual sight. It has attracted quite a few curious people who are eager to taste Sila's sun-cooked chicken. He's been using this cooking method for two decades now. And he says it's much better than traditional roasting methods. It is free, cooks all parts of the chicken, and best of all, it's 100% clean. Phetchaburi Rajabhat University thought Sila's idea was very good and useful, so they awarded him an honorary science degree.

Four rural villages in China were named Best Tourism Villages 2023 by the World Tourism Organization.

Huangling village in Jiangxi province, set in a hilly and mountainous region, is known for its surprising natural scenery, traditional architecture, and the preservation of ancient customs. The ancient houses in Huangling village are characterized by whitewashed walls, black-tiled roofs, and complex carved wooden elements. The village, rated as a national AAAA scenic spot, draws worldwide visitors throughout the year to view its live landscape.

Zhagana village, a globally important agricultural and cultural heritage site, is located at an altitude of 3,000 to 3,300 meters and is surrounded by mountains, in Gansu province. The steep mountains and Tibetan-style houses make up a "grand stone palace" where tourists can enjoy the harmony of nature and culture.

Xiajiang village, located in East China's Zhejiang province, is famous for its undestroyed natural beauty and a profound cultural heritage ranging from traditional folk culture to historical "red culture". The village has introduced unique tourism routes, high-level cultural programs, and a diverse range of celebrations.

Zhujiawan village, situated in Zhashui county, Shangluo city, possesses a variety of over 1,200 species of diverse animals and plant resources. Meanwhile, the village owns 25 intangible (无形的) cultural treasures. Additionally, it is home to 17 tangible cultural treasures. In recent years, Zhujiawan village has made use of its ecological strengths to develop tourism.