When it's five o'clock, people leave their office. The length of the workday,for many workers,is defined by time. They leave when the clock tells them they're done.

    These days, the time is everywhere: not just on clocks or watches,but on cell-phones and computers.That may be a bad thing,particularly at work.New research shows on that clock-based work schedules hinder morale and creativity.

    Clock-timers organize their day by blocks of minutes and hours.For example: a meeting from 9 a.m. to 10 a.m., research from 10 a.m.to noon,etc.On the other hand,task-timers have a list of things they want to accomplish.They work down the list,each task starts when the previous task is completed.It is said that all of us employ a mix of both these types of planning.

    What,then,are the effects of thinking about time in these different ways? Does one make us more productive? Better at the tasks at hand? Happier? In experiments conducted by Tamar Avnet and Anne-Laure Sellier,they had participints organize different activities-from project planning,holiday shopping,to yoga-by time or to-do list to measure how they performed under "clock time" vs "task time".They found clock timers to be more efficient but less happy because they felt little control over their lives.Task timers are happier and more creative,but less productive. They tend to enjoy the moment when something good is happening,and seize opportunities that come up.

    The researchers argue that task-based organizing tends to be undervalued and under-supported in the business culture.Smart companies,they believe,will try to bake more task-based planning into their strategies.

    This might be a small change to the way we view work and the office,but the researchers argue that it challenges a widespread characteristic of the economy: work organized by clock time.While most people will still probably need,and be,to some extent,clock-timers,task-based timing should be used when performing a job that requires more creativity.It'll make those tasks easier,and the task-doers will be happier.

    When I was young I wanted to be a model,so when a national contest was staged,I convinced my parents to have a try.I was selected and told that I was talented and that for only $900 I could attend a weekend event which dozens of the most famous modeling agencies from around the world would attend.At 13,my hopes of fame and fortune clouded all judgment and I begged my parents to let me go.We have never been rich,but they saw my enthusiasm and agreed.

    I imagined being signed by some famous model companies.For months,any boredom or disappointment I faced was pushed aside because I knew I would soon have the chance to be a real model.I thought I would grace the covers of famous magazines!

    Of course,I wasn't signed,but what hurt the most was being told that if I grew to about 1.75metres I could be a success.I prayed for a growth spurt（冲刺）because I could not imagine giving up my dream.I made an appointment with a local modeling agency and the agent demanded $500 for classes,$500 for a photo shoot,and $300 for other expenses.My parents only agreed after hours and hours of my begging.

    The agency sent me out on a few auditions,but with every clay I didn't receive a call,I grew more depressed.The final straw came in July after I had decided to focus on commercial modeling.There was an open call in New York City.We spent hours driving and another few hours waiting,only to be told that I was too short.I was depressed.

    Years later,I realized that the trip to New York was good as it made me notice I didn't actually love modeling, just the idea of it.I wanted to be special and I was innocently determined to reach an impossible goal.The experience has made me stronger and that will help me in the future.

    Enough sleep is important to health. The amount of sleep needed depends on the age of the person and the conditions in which sleep takes place. The young may need more sleep than the old, but usually eight hours are enough for the health of grown-ups. Some can do with less than this amount, but others may need more. Every person knows his own need. It is then a matter of good judgement to satisfy his need. Sleep should always be enough to make one bring back his strength and get ready for a day's work.

    Fresh air is necessary to sound sleep. It is not without reason for some people to think that it is practicable to sleep in the open air. When one can keep himself warm, out-of-door sleeping probably gives the body its most complete relaxation (放松).

    Ability (能力) to sleep lies largely in habit. The conditions referred to only lead to sleep. Out-of-door exercises, a good habit of regular hours and the avoidance (避免) of late eating and worry, which are largely within the control of any person, are all helpful to sound sleep.

    A bath at bedtime, neither hot nor cool but of body temperature may be helpful to sleep. Sleep-producing drug (药) should never be taken except when suggested by a doctor.

    People who often eat nuts appear to live longer, according to the latest study of its kind. The findings, published in the New England Journal of Medicine, suggested the greatest benefit was in those eating them on their daily diet.

    Eating nuts was linked to a healthier lifestyle including being less likely to smoke or be overweight and more likely to exercise. The British Heart Foundation said more research was needed to prove the link, “While this is an interesting link, we need further research to make sure if it's the nuts that protect heart health, or other sides of people's lifestyle .”

    The study followed nearly 120,000 people for 30 years. The more regularly people ate nuts, the less likely they were to die during the study. People eating nuts once a week were 11% less likely to have died during the study than those who never ate nuts. Lead researcher Dr. Charles Fuchs, from the Dana-Farber Cancer Institute and Brigham and Women's Hospital, said, “The most obvious benefit was a decrease of 29%in deaths from heart disease, but we also saw a significant reduction-11%- in the danger of dying from cancer.”

    They suggest nuts are lowering cholesterol(胆固醇). and insulin resistance(胰岛素抗性). Nuts contain unsaturated fat(不饱和脂肪), protein(蛋白质) and several kinds of vitamins and minerals and they can take the place of snacks like chocolate bars, cakes and biscuits.

    Victoria Taylor, senior expert at the British Heart Foundation, said, “This study shows close connection between regularly eating a small handful of nuts and a lower risk of death from heart disease.” Choosing plain, unsalted foods rather than sweet, salted, or chocolate-covered will keep your salt and sugar intake down.

    A family is a collection of people who share the same genes（基因）but cannot agree on a place to pull over for lunch. Ed and I, plus his parents and sister Doris and eight-year-old niece Alisha, are on a road trip to Yosemite. Ed wants Subway, I want. In-N-Out Burger, Doris wants Sonic. In the end, we compromise on McDonald's, where Alisha will get an action figure.

    It's a three-hour drive to Yosemite, but we're taking a little longer, as we're working in a tour of Highway 80's public restrooms. As the saying goes, “Not one bladder（膀胱）empties but another fills.” Many of these restrooms belong to gas stations. I prefer them to the high-tech ones on planes.

    We get back on the road. Ed is driving now. When all the tabloids（小报）have been read, the travel has grown tedious and anyone under age 12 asks “Are we there yet?” at ever-shortening internals. Just outside Manteca, California, we stop for coffee. At a Starbucks checkout, Ed buys a CD of Joni Mitchell's favorite musical picks. The hope is that it will have a calming effect.

    As we pull back onto the highway, it starts to pour. Then something amazing happens. As we climb the mountain, the rain turns to snow. The pines are spotted with white. We're struck dumb（说不出话）by the scene outside. For a solid 15 minutes, everyone forgets about their bladder, their blood sugar and the temperature. Alisha has never seen snow, so we pull over to make snowmen and catch snowflakes on our tongues. Then Ed realizes we need tire chains, and we have to turn back and drive 30miles to Oakhurst. “Good,” says Doris. “There was a very nice restroom there.”

    When people see machines that respond like humans, or computers that perform amazing feats of strategy, they sometimes joke about a future in which humanity will need to accept robot overlords. But buried in the joke is a seed of unease. Science fiction writing and popular movies have shown us about artificial intelligence (AI) that exceeds the expectations of its creators and escapes their control, eventually outcompeting and enslaving humans or targeting them for extinction(灭绝).

    Even in the real word, not everyone is ready to welcome AI with open arms. In recent years, as computer scientists have pushed the boundaries of what AI can accomplish, leading figures in technology and science have warmed about the frightening dangers that artificial intelligence may pose to humanity, even suggesting that AI capabilities could destroy the human race.

    But why are people so frightened about the idea of AI?

    Elon Musk is one of the famous voices that have raised red flags about AI, In July 2017. Musk told attendees at a meeting of the National Governors Association, I have exposured to the very cutting-edge Al, and I think people should be really concerned about it. I keep sounding the alarm bell. But until people see robots going down the street killing people, they don't know how to react, because it seems so impossible."

    Earlier, in 2014, Musk had labeled AI "our biggest existential threat," and in August 2017, he declared that humanity faced a greater risk from AI than the terrorists. Physicist Stephen Hawking, who died on March14, also expressed concerns about AI, telling the BBC in 2014 that "the development of full artificial intelligence could spell the end of the human race.