How much sleep do we need? We are all different. Some people need only three hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average of seven to eight hours a night. After age fifty, the average (平均) sleep time goes down to 6.5 hours a night. Most people have a bad night when they cannot fall asleep. The name of this problem is called insomnia.

This is not a new problem. Many famous people in history had insomnia. Some of these people had special ideas to make them sleep. Benjamin Franklin, the famous statesman (政治家) and inventor, had four beds. He moved from one to another to fall asleep. King Louis XIV of France had four hundred and thirteen beds and hoped to fall asleep in one of them. Mark Twain, the famous American writer, had a different way. He lay (躺) on his side across the end of his bed.

Mukbang is about the eating shows in front of the screen. In the shows, mukbangers eat food and sometimes talk to their fans.

Mukbang started in South Korea (韩国) in around 2010 and is becoming well-known in the whole world now. Why did mukbang first appear in this country? The reason is that eating by oneself is quite normal in South Korea. Watching mukbang can be a way to have someone to eat with when they are at home by themselves.

This is one of the reasons why many people around the world like watching mukbang. However, the way mukbangers eat food in some shows isn’t healthy. This can make people have bad habits and bring serious health problems. What’s worse, to have more fans and make more money, some mukbangers prepare a lot of food in front. But they throw away much food during the show or throw up (吐) food after the show to make watchers believe they eat up everything. In fact, it is not because they feel ill. These mukbangers waste (浪费) a lot of food.

We all know that food waste is a serious problem around the world, and stopping food waste has a special meaning for our country. So our country is doing a lot of things to solve the problem. What do you think our country can do for mukbang?

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Street performers（表演者）used to be street musicians（音乐人）before. The history of street musicians can go back to the Middle Ages（中世纪） in Europe. They were called “ troubadours” then. Nowadays, street performers are not only musicians. They can be actors, clowns, dancers, storytellers and so on. Most people call street performers “buskers” now. People often come across buskers on busy shopping streets and near parks and watch their shows. In return, they give the buskers some money before they move on.

In some cities, buskers need a permit（许可证）while in other cities the permit isn’t necessary. Most cities welcome buskers. It is believed that in busy city — center areas, buskers can help attract more shoppers. As people stopped to enjoy street shows, they are more likely to visit the nearby shops and do some shopping there.