Gather together a couple of good friends and take a leisurely walk through the streets—this is what many youngsters in China enjoy doing when they pay a visit     1     a new city. To them, Citywalk means “wandering around the city” on foot. Participants can follow a special urban route, exploring old     2     (building) or enjoying real local snacks.

The origins of Citywalk can be traced (追溯) back to London, England. Strictly speaking, this form of urban tourism     3     (be) not as casual and aimless as it may appear. In the beginning, Citywalk referred to tours where participants followed a     4     (plan) route under the guidance of tour conductors, exploring deep into the city’s history, culture, landscapes     5     other aspects. Gradually, the concept of Citywalk,     6     focuses on the quiet appreciation of urban lifestyle and cultural atmosphere, has gained popularity worldwide.

Up to now, the Citywalk trend     7     (spread) from first-tier cities like Beijing and Shanghai to second-tier and third-tier cities, encouraging more participants and event organizers to get involved. Some organizers invite folk culture researchers and enthusiasts (爱好者)     8     (act) as tour guides.

In short, Citywalk not only offers     9     way for young people to interact with a city but also provides them with a new social scene, where people wit the same interests and ideas can     10     (easy) make friends.

4 . Two hours of screen time a day is enough to “dumb down” children or result in depression or physical illness, a global study has found.

The global study analyzed data measuring screen time, physical activity, mental health indicators and physical illness reported by 577, 000 children aged 11, 13 and 15 from 42 rich countries. It found that screen time—not including school work—averaged 6. 3 hours for boys and 5. 4 hours for girls.

The Australian-led study shows girls experience unhealthiness after just two hours watching screens including television, social media or online gaming. However, boys are more likely to be physically active, they can safely spend twice as much time on screens each day before suffering health problems.

Dr Khan said too much time spent watching TV, gaming or on social media could lead to “reduced learning abilities”. “If you spend more time on screens you are likely not to do well in your study performance.”

“We also found there were some benefits during the first hour of daily screen use, but bad effects on mental health kick in after 75 minutes in girls and 105 minutes in boys,” Dr Khan said. The solution to mental health the study found was an hour of physical activity, and no more than two hours a day using screens, apart from schoolwork. That is to say, children need to balance screen time with “green time” outdoors. Children who exercise or play outdoors regularly are healthier and happier, the study shows.

Melbourne dad, Tom Hindhaugh, said he tried to reduce screen time for his son, Patrick, 13. “Clearly we need those screens for homeschooling. Technology is the necessary way kids can communicate and hang out with each other,” he said. “But we need to get children outside and moving. Physical activity is the key for their health, whether it’s walking, riding a bike or kicking the football.”

6 . I recently had a conversation with a friend who was feeling very upset about work. Why? He thought his manager didn’t like him. He rarely heard much from his manager, and when his manager said something, it was about correcting some aspects of his work or giving him some constructive advice.

Not surprisingly, given my friend’s understandably anxious view of these workplace dynamics (动态), he was afraid of his annual performance evaluation. He was worried that his boss might even tell him that he wasn’t needed anymore. Accordingly, he considered looking around for another job — not because he really wanted to, as he liked the kind of work he was doing, but because he suffered from the kind of management.

The evaluation day came, and to his great surprise, rather than being harshly critical, his manager told him that he was doing a fine job and gave him a promotion.

The sad truth is, this kind of phenomenon is by no means unusual in the workplace. One recent survey showed that nearly half of the employees have considered leaving a job “due to lack of recognition”. Another similar study found 46 percent of the employees left a job “because they felt unappreciated”.

The good news is that, in this case, the damage was repaired before it was too late — before my friend was out the door and his company began the expensive and time-consuming process of hiring a new employee. But as the research noted above shows, workplace problems related to recognition and appreciation are as common as the office air we breathe.

This conforms with my personal experience; during my decades of corporate management, I saw similar appreciation issues all the time. When a job isn’t done well, nobody deserves anything, of course. But when a job is done well, if you’re an employee, it’s entirely natural to expect at least a bit of appreciation. So if you’re a manager, it’s a good idea to show some. It’s that simple.

8 . Twins may be more common today than at anytime in history. Researchers analyzed records from 165 countries and found a significant rise in twin birth rates since the 1980s, with one in 42 people now born a twin. According to the survey, the global twin birth rate has risen by one-third, on average, over the past 40 years.

“The trends are really quite striking,” said Christiaan Monden, a professor at Oxford University. “Over the past 40 years we’ve seen a strong increase in twinning rates in rich and developed countries. Globally, twinning rates have risen from nine to twelve per 1,000 births since the 1980s, but the picture varies from country to country. The greatest rises are seen in North America (71%), Europe (60%) and Asia (32%). In the UK, twinning rates rose about 62%. In the Oxford study, a decrease of more than 10% was found in only seven countries over the dates surveyed. “The absolute number of twin deliveries (分娩) has increased everywhere except South America,” Monden said. “In North America and Africa, the numbers have increased by more than 80%, and in Africa this increase is caused almost entirely by population growth.”

Raj Mathur, a doctor at St. Mary’s Hospital in Manchester, said, “It doesn’t surprise us that twinning rates have increased because the availability of assisted reproduction (生殖) has increased and also because women are slightly older when they have their first children, and both those things will increase the twinning rate.”

“The majority of twin babies are completely fine, but there is no doubt that a twin pregnancy (怀孕) carries greater risks for the mother and the baby. So when we can avoid it, we should avoid it. The principle we follow is simply summed up by the phrase ‘one at a time’,” Mathur said.

9 . The word mukbang is from the Korean words “muk-ja” (let’s eat) and “bang- song” (广播). Hosts eat amounts of food in front of a camera while interacting with their audience. The show appeared first in South Korea, where the videos became popular via live stream(直播)channels.

The show comes from South Korea but other countries follow in significantly different ways. Take America as an example, Koreans plan their streams around dinnertime hours so viewers can feel like they are sharing a meal with a friend. And yet Americans tend (倾向于) to be more conversational in their videos which are pre-recorded. Korean mukbangers tend to eat traditional Korean dishes while American mukbangers eat a wider variety of foods.

Why are millions of people so drawn to watching perfect strangers eat in the first place? It’s a combination of sensory, psychological, social, emotional, environmental even neurological factors, says Rachel Herz, a neuroscientist at Brown University Alpert Medical School. She specially explains how food attracts our senses and develops our behavior when it comes to what we like to eat. A big part of that neurological factor is the ASMR (autonomous sensory-motor response), described as a brain feeling which can help people relaxed from the familiar sounds of eating in the mukbang videos.

Earning the popularity and money, more and more mukbangers appear. However, the show has not come without its unfavorable comments. As our habits change, we spend more and more social engagement on social media. It’s only a matter of time before mukbang affects our behavior around food. Viewers could probably develop unhealthy eating habits from watching. Despite the negative comments, mukbang continues to do well on the Internet and it doesn’t look like it’s slowing down anytime soon.