New research has found that even if you give up smoking,the damage it has done to your genes（基因）will stay there for a much longer time.

    In the research,a team of US scientists studied the blood of 16,000 people.Among them,some were smokers,some used to smoke,and the rest were non-smokers.Scientists compared their genes and found that more than 7,000 genes of smokers had changed-a number that is one-third of known human genes.

    According to NBC News,both heart disease and cancer are caused by genetic changes.Some people may have had the changes when they were born,but most people get them in their day-to-day lives while doing things like  smoking.

When you stop smoking,a lot of these genes will return to normal within five years.This means your body is trying to heal（治愈）itself of the harmful effects of smoking.But the changes in some of the genes stay for longer.They can stay for as long as 30 years.It's almost like leaving a footprint on wet cement（水泥）一it will always be there, even when you've walked away and when the cement becomes dry.

    Although the study results may make people unhappy,there is a bright side: the findings could help scientists invent medicine to treat genetic damage caused by smoking or find ways to tell which people have heart disease or cancer ricks.

    One day, a poor man, who had only one piece of bread to eat, was walking past a restaurant. There was a large pot of soup on the table. The poor man held his bread over the soup, so the steam from the soup went into the bread, and gave it a good smell. Then he ate the bread.

    The restaurant owner was very angry at this, and he asked the man for money, in exchange for the steam from the soup. The poor man had no money, so the restaurant owner took him to Nasreddin, who was a judge at that time. Nasreddin thought about the case for a little while.

    Then he took some money from his pocket. He held the coins next to the restaurant owner's ear, and shook them, so that they made a dingling (叮当声) noise.

    “What was that?” asked the restaurant owner.

    “That was payment for you,” answered Nasreddin.

    “What do you mean? That was just the sound of coins!” said angrily the restaurant owner.

    “The sound of the coin is payment for the smell of the soup,” answered Nasreddin. “Now go back to your restaurant.”

    Generations of Americans have been brought up to believe that a good breakfast is one of life's essentials. Eating breakfast at the start of the day, we have all been told again, is as necessary as putting gasoline in the family car before starting a trip.

    But for many people the thought of food as first thing in the morning is by no means a pleasure. So despite all the efforts, they still take no breakfast. Between 1977 and 1983, the latest year for which figures are available, the number of people who didn't have breakfast increased by 33 percent-from 8.8 million to 11.7 million-according to the Chicago-based Market Research Corporation of America.

    For those who feel pain or guilt about not earing breakfast, however, there is some good news. Several studies in the last few years indicate that, for adults especially, there may be nothing wrong with not taking breakfast. “Going without breakfast does not affect performance,” said Arnold E. Bender, former professor of nutrition（营养）at Queen Elizabeth College in London, “nor doegiving people breakfast improve performance.”

    Scientific evidence linking breakfast to better health or better performance is surprisingly inadequate, and most of the recent work involves children, not adults. “The literature,” says one researcher, Dr. Ernesto Pollitt at the University of Texas, “is poor.”

    Two things changed my life: my mother and a white, plastic, daisy bike basket. I would be a different person if my mom hadn't turned a silly bicycle accessory(配件) into a life lesson I carry with me today.

    It was summer and, one day, my mother drove me to the bike shop to get a tire fixed — and there it was in the window. White, shiny, plastic and decorated with daisies, the basket seemed so appealing and I knew I had to have it.

    "Mom, please can I get it? I'll do extra chores for as long as you say. I'll do anything, but I need that basket. I love that basket. Please, Mom. Please?"

    "You know," she said, gently rubbing my back while we both stared at what I believed was the coolest thing ever, "If you save up, you could buy this yourself."

    "By the time I make enough it'll be gone!"

    "Maybe Roger here could hold it for you," she smiled at Roger, the bike guy.

    "For that long? He can't hold it for that long, Mom. Someone else will buy it. Please, Mom, please?"

    "There might be another choice," she said. My mother bought the beautiful basket and put it safely out of reach in some hiding place I couldn't find. Each week I eagerly counted my growing nest egg earned by extra work here and there (washing the car, helping my mother make dinner, delivering milk around the neighborhood). And then, weeks later maybe, I counted, re-counted and jumped for joy. Oh, I made it! I finally had the exact amount we'd agreed upon.

    Days later, the unthinkable happened. A neighborhood girl I'd played with appeared with the exact same basket fixed to her shiny, new bike. I rode my bike fast home to tell my mother about this disaster, this horrible turn of events.

    And then came the lesson I've taken with me through my life: "Honey, your basket is extra-special," Mom said, gently wiping away my hot tears. "Your basket is special because you paid for it yourself."

    Maybe ten-year-old Elizabeth put it best when she said to her father. “But, Dad, you can't be healthy if you're dead.”

    Dad, in a hurry to get home before dark so he could go for a run, had forgotten to wear his safety belt — a mistake 11.5% of the US population make every day, according to a survey in 2015.

    The percentage doesn't seem so bad, but the big question is why still so many people ignore it when every day there are reports about car accidents and casualties (a death toll of 37461 in 2016).

    There have been many myths about safety belts ever since their first appearance in cars some forty years ago. The following are three of the most common.

    Myth Number One: It's best to be “thrown clear”of a serious accident.

    Truth: Sorry, but any accident serious enough to “throw you clear”is also going to be serious enough to give you a very bad landing. And chances are you'll have traveled through a windshield (挡风玻璃) or door to do it. Studies show that chances of dying after a car accident are twenty-five times greater in cases where people are “thrown clear.”

    Myth Number Two: Safety belts “trap” people in cars that are burning or sinking in water.

    Truth: Sorry again. but studies show that people knocked unconscious (昏迷) due to not wearing safety belts have a greater chance of dying in these accidents People wearing safety belts are usually protected to the point of having a clear head to free themselves from such dangerous situations, not to be trapped in them.

    Myth Number Three: Safety belts aren't needed at speeds of less than 30 miles an hour (mph).

    Truth: When two cars traveling at 30 mpb hit each other, an unbelted driver would meet the windshield with a force equal to diving headfirst into the ground from a height of 10 meters.

    I'M Pei, the Chinese-American, who was regarded as one of the last great modernist architects, has died at the age of 102.

    Although he worked mostly in the United States, Pei will always be remembered for a European project: His redevelopment of the Louvre Museum in Paris in the 1980s. He gave us the glass and metal pyramid in the main courtyard, along with three smaller pyramids and a vast subterranean (地下的) addition to the museum entrance.

    Pei was the first foreign architect to work on the Louvre in its long history, and initially his designs were fiercely opposed. But in the end, the French — and everyone else — were won over. Winning the fifth Pritzker Architecture Prize in 1983, he was thought as giving the 20th century "some of its most beautiful inside spaces and outside forms … His talent and skill in the use of materials approach the level of poetry."

    After studying architecture at the Massachusetts Institute of Technology and Harvard, Pei set up his own architectural practice in New York in 1955.

    Designing the John F. Kennedy Presidential Library & Museum in 1964 established him as a name. His East Building of the National Gallery of Art in Washington in 1978 changed people's ideas of a museum. The site was an odd trapezoid (梯形) shape. Pei's solution was to cut it in two. The resulting building was dramatic, light and elegant — one of the first crowd-pleasing cathedrals of modern art.

    Though known as a modernist, and notable for his forms based on arrangements of simple geometric (几何的) shapes, he once urged Chinese architects to look more to their architectural tradition rather than designing in a western style.

    In person, I.M. Pei was good-humored, charming and unusually modest. His working process was evolutionary, but innovation (创新) was never an intended goal.

    "Stylistic originality is not my purpose," he said. "I want to find the originality in the time, the place and the problem."