When her five daughters were young, Helen An always told them that there was strength in unity (团结). To show this, she held up one chopstick, representing one person. Then she easily broke it into two pieces. Next, she tied several chopsticks together, representing a family. She showed the girls it was hard to break the tied chopsticks. This lesson about family unity stayed with the daughters as they grew up.

    Helen An and her family own a large restaurant business in California. However, when Helen and her husband Danny left their home in Vietnam in 1975, they didn't have much money. They moved their family to San Francisco. There they joined Danny's mother, Diana, who owned a small Italian sandwich shop. Soon afterwards, Helen and Diana changed the sandwich shop into a small Vietnamese restaurant. The five daughters helped in the restaurant when they were young. However, Helen did not want her daughters to always work in the family business because she thought it was too hard.

    Eventually the girls all graduated from college and went away to work for themselves, but one by one, the daughters returned to work in the family business. They opened new restaurants in San Francisco and Los Angeles. Even though family members sometimes disagreed with each other, they worked together to make the business successful. Daughter Elizabeth explains, “Our mother taught us that to succeed we must have unity, and to have unity we must have peace. Without the strength of the family, there is no business.”

    Their expanding business became a large corporation in 1996, with three generations of Ans working together. Now the Ans' corporation makes more than $ 20 million each year. Although they began with a small restaurant, they had big dreams, and they worked together. Now they are a big success.

    Ben, at the age of 23 ,was the youngest man to ski solo to the North Pole. He dragged a 180-kilogramme sledge (雪橇) over 1,420 miles through the worst Arctic conditions. This year, Ben plans to ski solo from the Antarctic coast to the South Pole and back in the autumn, carrying all his supplies on his sledge.

    Ben Saunders was fired after persuading the firm to support his disorganized first adventure. “Everything that could go wrong did go wrong. We didn't get to the Pole, so we had no media interest. No one heard about it.”

    “People said it was impossible for me to get to the Pole. I said, “No, I can get there,” and I did. Self-belief, I see it as being a bit like a muscle — it's my belief that the more you stretch yourself the stronger it gets. If you never do anything that's uncomfortable or risky then your self-belief gets weaker. So that's one of the lessons I've figured out along the way.

    “My Antarctic adventure is just practicable and that's what is exciting to me. If I knew I could do it without too much bother, I wouldn't be interested." Why? “Personally I'm attracted by the human performance element to it. Not that long ago, running a marathon was seen as the top point of human attempt, and now I wouldn^'t be that surprised if my mum said she was going to run one."

    People^'s horizons are changing. “I'm not particularly gifted. I've just chosen this one goal to achieve and I've been working hard to realize it. And that^'s the thing that attracts me: with enough training and enough determination, enough focus and preparation, how far can we go? And I don ^， t think I've found out yet.”

    Time flies, or so they say. No matter where you are, humans are constantly measuring and checking time. Some of us are good at it—planning and doing things ahead of time—while others are always trying to beat the clock and do things at last. What about if you are behind time?

    Delay can be serious. If you were one minute late for work, would you resign? It may sound extreme to many of us, but that is exactly what occurred in the UK upper chamber of parliament, the House of Lords, in January 2018. International development minister Lord Bates arrived one minute late, and, as a result, was unable to answer a scheduled question. Instead of trying to make up for lost time, he resigned on the spot. He apologised for his discourtesy and stated that he was ashamed. His resignation, though, was not accepted by the UK prime minister.

    So, how late is too late? Many cultures take punctuality very seriously, whereas others seem to accept lagging behind as just the normal way of things. BBC employees from Latin America, Rwanda and Sri Lanka said that there are more flexible attitudes to timekeeping in their cultures. In Latin America, things may happen five minutes, 20 minutes, an hour or even two after they were planned. Whereas, in Sri Lanka, lateness is a part of the daily routine. This is because of poor infrastructure and heavy traffic conditions. In Rwanda, those who attend to deadlines with strick timekeeping are said to be “like a typical European”.

    On the other hand, German and Japanese employees mentioned a stricter adherence to time. In Japan, it is common to make an effort to arrive with time to spare for an appointment. Those who arrived at the stroke of nine to a meeting starting at 9 am would be considered late. In Germany, however, if a dinner party were to begin at eight, a person who had arrived five minutes prior, may walk around the block to make sure that they arrive at eight on the dot.

    "Fast fashion" means clothes which are inexpensive but look like the latest designs. One reason for the success of fast fashion is the rise of the social media. A report by the investment research firm Bernstein found that Millennials—people born in the 1980s and 90s— wanted to wear a variety of clothes in the photos they posted on social media. As a result, many businesses which offer trendy and low-cost clothes are growing.

    But the situation is changing now. Maxine, a woman in her early thirties, looks in her closet full of clothes, but she has nothing to wear. She says she hates always shopping for what is in style.    Instead, she wants to buy fewer clothes that she can wear over and over. "Other people want the same thing." she says.

    So Maxine and a business partner, Soraya, started a "slow fashion" clothing company called Zady. "Slow fashion" means clothes that last a long time. They often feature classic colors and shapes, and are made from natural materials.

    The terms "fast fashion" and "slow fashion" are related to "fast food" and "slow food": fast food is still popular in the U.S., but many restaurants increasingly offer high-quality, more expensive and relaxed meals.

    Like slow food, slow fashion also aims to use sources that are good for the environment and workers. Maxine says people in her generation want to know where their clothes come from and who is making them. To answer Millennials' demand for information about the products they buy, Ms Maxine's company, Zady, includes details about the history of the brands. It also describes the process in which the clothes are made. Maxine says Zady aims to tell shoppers where their clothes come from, where they go, and how they impact the world.

    The international business H&M is answering Millennials' demands in another way. It has created a recycling program for clothes. Shoppers who bring clothes they no longer want to H&M stores can receive a discount on new things they buy. An H&M spokesman says, "We have a clear vision to avoid and minimize waste that goes into landfills."

    Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity (湿度).

    In very cold climates, there is a constant danger of developing hypothermia, which is a life-threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0℃. However, differences in persons and even the time of day can cause it to be as much as 6℃ higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4℃. Below 29.4℃, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6℃. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7℃.

    In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life-threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7℃. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.