In the networked world, it's very difficult to talk to Chinese people without using emojis（表情符号）. However, did you know that people in different age groups have totally different preferences for choosing their emojis? The result is based on a report released by Tencent's WeChat, on its official weibo account on Wednesday.

According to the report, for users who were born in the 2000s, their favorite WeChat emoji would probably be the widely used “facepalm”. 【小题1】They also may be a night owl without much sleep, while iced beverages and desserts are their cup of tea.

For China's post-90s WeChat users, 【小题2】, and the emoji “face with tears of joy” may rule their online social life. Also, their reading materials have changed from entertainment and gossip to the current relationship and lifestyle pieces.

And if you were born in the 1980s, your tastes have remained the same. 【小题3】 And “grin” is your emoji of the year.

【小题4】They like to use the emoji “chuckle(咯咯笑)” and go through their moments frequently every day.

Users over 55 are the early-bird group with rich entertainment activities in WeChat, such as looking through moments, reading and shopping. 【小题5】

Since the release of the report, some online users believe that their chat data has been used for big-data analysis. But others are asking where they can attain their own personalized WeChat usage reports.

First impressions are important, but are first impressions correct? Personally, I’m not so sure, and according to new research, neither is science.

You really shouldn’t judge a book by its cover, but I certainly have, and I’m willing to bet (打赌) you’ve done it, too. Consider this, though: If I’d let my opinion on, say, the boring cover of John Steinbeck’s The Grapes of Wrath stop me from reading this great novel, I would have missed out on one of my favorite books to date. First impressions are important because they can influence you one way or another, but they shouldn’t be the be-all and end-all of your opinion on someone.

According to Jonathan Freeman, a professor at New York University, first impressions are collected within only a few hundred milliseconds and are often based on the person’s facial appearance.

“First impressions of faces can influence how we make decisions about people,” Freeman explained in a statement. Therefore, in order to put an end to such first impressions, you have to understand where your first assuṃptions (假设) come from. In order to do this, a team of researchers in Switzerland performed two experiments: The first required participants to judge the personalities of dozens of people only based on photos they were shown online. For example, in this part of the study, researchers took note of how participants related personality features like friendliness with various appearances. The second experiment explored what kind of facial features were connected with exact personality features. For example, someone who has a round face with “babyish features” might be considered as friendlier or more harmless than someone who isn’t smiley in their photo.

The results showed that first impressions often aren’t all right. Look, it’s really unfortunate that first impressions aren’t always right. Still, these first impressions happen regardless of whether or not they’re right, so the best thing you can do is try to put your best foot forward without, of course, giving up your authenticity (真实性); you are exactly who you were meant to be, and all you can do is be the best person you can.

Sleep repairs the body and the mind and helps prevent disease by strengthening the immune system. However, many adults do not get eight hours of sleep each night. The average adult today gets only 6.4 hours of sleep. Only in recent years have health professionals begun to realize the seriousness of sleep deprivation in the working population. A significant number of people work at night, work long hours, or suffer from sleeplessness or jet lag.

Studies show that the brain is negatively affected by sleep deprivation because certain patterns of electrical and chemical activity that occur during sleep are interrupted and the brain cannot function normally. In one study, thirteen healthy adult subjects(实验对象) who usually had normal sleep patterns were kept awake and carefully monitored in a lab during a period of 35 hours. During the experiment, the subjects were asked to perform several tasks, such as mathematics and word problems, while undergoing scans of their brain activity. The researchers found that the temporal lobe (颞叶) of the brain, the region involved in language processing, was active during speech tasks in rested subjects but not in subjects who lacked enough sleep. After several hours without sleep, there was no activity within this region.

Several studies show that getting fewer than six hours of sleep can damage short-term memory and reaction time—thus causing a serious risk of accident. In one study of drivers, researchers reported that sleep deprivation had the same effects as being drunk. They found that people who drove after being awake for 17 hours performed worse than those with a blood alcohol level of 0.5 percent, the legal limit for drunk driving in most western European countries. The researchers concluded that countries with drunk driving laws should consider similar restrictions against sleep-deprived driving.