Here is an astonishing and significant fact: Mental work alone can't make us tire. It sounds absurd. But a years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue (疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional(情绪的) attitudes. One of England's most outstanding scientists, J.A. Hadfield, says, “The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares, “One hundred percent of the fatigue of sitting worker in good health is due to emotional problems.”

What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated—those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

    Most Americans are worried about new technology. They are concerned that machines, including robots, will take over work now done by humans. These findings come from a new report by the Pew Research Center of Washington D. C.

    About 75 percent of Americans questioned by Pew said automation will increase income inequality between the rich and the middle class and poor. And 64 percent of people expect automation to be so common in America that people will face difficulty finding things to do with their lives.

    Some of the concerns about technology come from a distrust about whether machines will always make the right decision. Many Americans believe humans have better judgement in dealing with. complex matters. One example is selecting a person for a job. Three-quarters of Americans said they would not want to apply for a job that uses a computer program to choose the most qualified person.

    “Most Americans want the government to limit automation. For example, 87 percent support a requirement that all driverless vehicles have a human in the driver's seat who can take control when an emergency occurs. And 85 percent want to limit machines to mostly doing jobs that are dangerous or unhealthy for humans. And only 25 percent expect more jobs to come from automation,” Pew said.

    Mark Zuckerberg, the co-founder of Facebook, spoke last May to graduating seniors from Harvard University in Massachusetts. His talk centered on the uncertain future facing young people. “Our generation will have to deal with tens of millions of jobs replaced by automation like self-driving cars and trucks.” Zuckerherg told the graduates.

    Zuckerberg said young people had better launch(发起)projects that will bring both jobs and direct benefits to the people of the world. He said in his speech that 30000 people worked to put a man on the moon, and millions of people built the Hoover Dam as well as other great projects over the last 100 years.

    Even though it's not the most popular time of year to get married, I allow my thoughts to wander and consider the most unusual marriage habits across the world.

    In some parts of India it is believed that ghosts can stay with certain people of the living world. In general, girls who are born with a baby tooth and girls who are very ugly or have some facial damage are believed to be owned by ghosts. The only way to free from the ghosts is for the girl to marry an animal, typically a goat or a dog. She is free to marry a man later on, when the ghosts are proven to be freed from her. I wonder who makes this decision and how they come to their conclusion.

    In Korea, it is a custom for grooms to request that their successfully married friends carve them wooden ducks as a symbol of great marriage. Hand-carving a wooden duck can't be easy. This leads me to wonder why it's a duck and not another animal.

    Imagine being as young as 5 and already your parents are sending you to a fat farm where you are forced to eat too much food until you vomit (呕吐). Then, the old woman watching you eat forces you to eat that vomit. This is not a TV show. This is really happening in some parts of Africa. Men there want women fat; the fatter the better. It doesn't matter if it ruins their health or make them live shorter lives. All that matters is that the woman is as large as possible in order to sell her for a high price when she reaches the age for marrying.

    One of the qualities that most people admire in others is the willingness to admit one's mistakes. It is extremely hard sometimes to say a simple thing like "I was wrong about that," and it is even harder to say, "I was wrong, and you were right about that."

    I had an experience recently with someone admitting to me that he had made a mistake fifteen years ago. He told me he had been the manager of a certain store in the neighborhood where I grew up, and he asked me if I remembered the egg cartons (in many countries, eggs are sold by the dozen and are put in cartons.) Then he related an incident (event, matter) and I began to remember unclearly the incident he was describing.

    I was about eight years old at the time. I went into the store with my mother to do some shopping. On that particular day, I must have found my way to the food department where the incident took place.

    There must have been a special sale on eggs that day because there were lots of eggs in dozen and half-dozen cartons. The cartons were put three or four feet high. I must have stopped in front of the piles of egg cartons. Just then a woman came by pushing her shopping cart and knocked off the cartons. For some reason, I decided it was up to me to put the eggs back together, so I went to work.

    The manager heard the noise and came rushing over to see what had happened. When he appeared, I was on my knees looking at some of the cartons to see if any of the eggs were broken, but to him it looked as though I was the one who just did it. He severely reprimanded me and wanted me to pay for any broken eggs. I tried to explain, but it did no good. Even though I quickly forgot all about the incident, it is plain that the manager did not.

    People who like travelling have their reasons. They believe that travelling can help them expand their field of view, especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike travelling also have some reasons.

    Travelling, in my opinion, does more good than harm. Most importantly, it broadens our mind. We can get in touch with other civilizations, cultures, customs and ideas.

Through history, most people travelled because of necessity (必要性)—not for pleasure. People travelled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever travelled just for the fun of it. In ancient times, for example, rich Romans travelled all the way to Greece to take part in the Olympic Games, and festivals. Of course, some people decided to travel just out of curiosity (好奇心). They wanted to find out what it looked like beyond the horizon (地平线). Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.

    So, travelling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.

If you are a psychology enthusiast, you have probably heard of the famous marshmallow test （棉花糖实验）. In this task, kids are given a marshmallow, and are told that they can eat that marshmallow now, or wait a little while, and have two marshmallows instead. Some kids eat the marshmallow immediately, but most try their best to wait for two. 

When the researchers followed up with those kids later in life, children who waited longer had better life outcomes: more academic success, better social behavior, and even markers of better health. They believe those children who keep waiting are the ones with the most self-control-a key factor in success, and that's why they are so successful later. 

But what if the behavior in the marshmallow test has more to do with cultural norms than self-control?

A 2022 study tested the idea that children may decide how long to wait for rewards based on what they are accustomed to waiting for in their culture. For example, in the United States, there is no widespread mealtime custom of waiting until everyone is served. In Japan, however, there is. 

Because of this difference in norms, the researchers hypothesized that Japanese children would wait longer in the marshmallow test than the American children. This is exactly what they found later in experiments. 

But this isn't conclusive evidence; after all, maybe Japanese children actually have better self-control, or maybe they differ from American children in other ways that could explain the result. 

In the U. S. , gifts are usually given on special occasions and children usually have to wait before they can unwrap their presents. In Japan, however, gift-giving happens more often, and children usually open presents immediately. 

Given these cultural differences, scientists expected that if they ran the test with gifts instead of marshmallows, American kids would wait longer. Once again, their hypothesis was correct. 

This is a powerful result because it demonstrates the importance of culture and habit in shaping behavior. If a child waits only few minutes before giving up on two marshmallows but much longer to unwrap a gift, can we really say that child lacks self-control? I don't think so. I think it just means that they are adjusting well to their social settings.