The map gives the general instruction of fire escape (逃跑) in a student accommodation (住所) of a junior high school.

The layout (布局) of the accommodation mainly includes bedrooms—with corridors linking (连接) them with stairs and fire exits.

The fire escape routes (路线) on the right side can help more students to escape compared with its left. When we come to a new place, we should learn about the escape routes first.

How do you greet your friends? People from different cultures may have different answers: shaking hands, nodding, kissing...But have you ever wondered how animals “say hello” to others?

We know how similar chimpanzees (黑猩猩) are to humans. It’s no surprise that their greetings are also close to ours. Chimpanzees usually greet each other with a hand touch, a hug or sometimes a kiss. Some of them can also communicate through simple sign language (手语).

Some animals seldom make loud sounds, for example, giraffes. Male giraffes often use their necks to greet each other. Their necks can reach up to two meters. When two giraffes meet, they may “shake” their necks and rub (摩擦) them against each other. This is to feel how strong and tall the other is.

Dolphins greet one another with whistles (哨叫声). They can hear other dolphins from many kilometers away. Every dolphin has a different whistle. It tells information about the dolphin, such as its age and health. When two groups of dolphins meet, they each choose a member of the other group to “talk” to. The two groups can then join up and travel together.

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In 2016, Agent, a British company, tested five-hour working days for a month. The hope was that the people in the company would feel happier with reduced working hours. However, the results of the experiment were mixed.

“Lots of good things happened,” says Agent CEO Paul Corcoran. “We looked at tasks in terms of time: Do this in 15 minutes and that in half an hour. We wasted no time. People were missing the worst of the traffic because they were coming in at 10 a. m. instead of 8:30 a. m.”

Problems, however, quickly came up. “People used to have eight hours to finish their jobs. Now, they only had five hours,” Corcoran explains. “The idea was to give people more freedom, but they ended up feeling more stressed.”

In most companies around the world, an employee works for eight hours every workday. But many researchers have looked at the links between working hours and productivity (生产效率). They found that most people could only be productive for five hours each day.

Some companies have been experimenting with shorter working days. In these companies, people work from 8 a. m. to 1 p. m. with no breaks. In order to have the afternoons to themselves, they become much more focused than before. Their productivity increases by 50 percent.

But just like Corcoran, many managers have seen problems with reduced working hours. In addition to the added pressure to complete tasks on time, people are losing something on the relationship level. Since they no longer have time for small talk, it has been harmful for team culture.

It’s hard to say how long the perfect working day should be. Reduced working hours sound great, but having to do more work in less time is tiring. Which would you prefer, five-hour working days or traditional eight-hour ones?