New York—Michelle Obama made a daring decision to return to the same designer who created her Inaugural (就职）Ball dress four years ago —and the risk paid off.

    The First Lady looked extremely attractive in a thin, sweeping, and ruby-colored dress by designer Jason Wu. She teamed the dramatic dress with heels by Jimmy Choo and a diamond ring by Kimberly McDonald.

    She surprised the fashion establishment by returning to a Wu design which had been the custom made for her.

    Four years ago at her first Inauguration Ball, Michelle shimmered（熠熠生辉）in an off-white, one-shouldered floor-length dress by the designer.

    Wu, who was 26 at the time and had only been working in fashion for three years, saw his career take off after the First Lady's surprise decision to wear one of his dresses.

    He said at the time that he was unaware she had chosen the dress and had been watching at home on his couch and eating pizza when she appeared.

    After her 2013 decision, Wu told Women's Wear Daily: “Mrs Obama likes to keep her secrets. She fooled me again.”

    Wu released a women's clothing and accessories（装饰品）collection at Target last year and continues to be popular with the First Lady for official engagements.

    The sleeveless, cross-halter neck dress with low-cut back flattered（突出）49-year-old Michelle's arms and neat waist.

    It had been created especially for her by Wu and was a departure from the dark and plain colour tone she stuck to at earlier inauguration events.

    Mrs Obama's new hairstyle —she had bangs（美发沙龙）cut on her birthday last week  had been loosely tousled（蓬松的）for the special night.

    Vice-President Joe Biden's wife Jill also looked attractive in a blue silk dress by Vera Wang at the Inauguration Ball.

    Are you preparing for a big test? If so, you may want to go to play some basketball in between hitting the books. Doctors are starting to find more and more information that suggests a connection between exercise and brain development. Judy Cameron, a scientist at Oregon Health and Science University, studies brain development. According to her research, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed. Dr. Cameron is sure that this allows people who exercise to think better. As she says, "While we already know that exercise is good for the heart, exercise can actually cause physical changes in the brain."

    The effects of exercise on brain development can even be seen in babies. Babies who do activities that require a lot of movement show greater brain development than babies who are less physically active. Even a little movement can show big results. Margaret Barnes, a scientist, also believes in the importance of exercise. She thinks that many learning disabilities that children have in primary school or high school can result from a lack of movement as babies. Babies need movement that encourages and excites their five senses. They need to set up a connection between motion and memory. In this way, as they get older, children will begin to connect physical activity with higher learning," says Margaret.

    Older people can develop their brains as well. Cornell University studied a group of seniors who have a short-term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for babies, exercise for older people should not be too simple. Learning some new skills or actions, such as with yoga or tai-chi helps to open up memory paths in the brain that may not have been used for a long time. For most people, any type of physical activity that increases the heart rate is helpful. The main aim is to increase the brain's flow of blood. And your brain can benefit from as little as two to three hours of exercise a week.

    It has taken an extremely long time－161 years－but the National Portrait Gallery finally has the Duke(公爵)of Wellington in its collection after a fundraising campaign reached its ￡1. 3m target.

    The gallery announced on Thursday that it had acquired Sir Thomas Lawrence's unfinished final painting of a man regarded as Britain's greatest soldier after a successful appeal.

    Nicholas Cullinan, the gallery's director, said the NPG had been looking for a suitable painting of the Duke of Wellington since the gallery was founded in 1856.

    He called it "a remarkable painting", while Lucy Peltz, the gallery's senior manager of 18th­century paintings, said the work was "an inspiring and powerful image of one of the most influential men of the 18th and 19th centuries".

    The NPG announced last November that it needed to raise ￡300,000, the final piece of a funding jigsaw(拼图). The Art Fund had already contributed ￡350,000 and the appeal reached its target thanks to ￡200,000 from the G&K Boyes charitable trust and ￡180,000 from the National Heritage Memorial Fund. A further ￡570,000 came from a public appeal and the gallery's own funds.

    It was painted in 1829 when Wellington was prime minister, however, Lawrence died in 1830 leaving the portrait unfinished. The gallery believes it is a more attractive work because of that, with the viewer focusing more on the man himself rather than any clothes of power.

    Dan Snow, the historian and broadcaster, said Wellington was a "Titanic figure" in British history, the only field greatest prime minister, a man of genius on and off the battlefield. He added:" This arresting portrait must sit in the national collection and now, following an outpouring of donation, it will do. The artist has caught the Duke's legendary features. Among his many contributions to British life he formed the culture of unbending spirit in the face of difficulty."

    The painting was lent to the NPG in 2015 for an exhibition marking the Battle of Waterloo.

Yuan Longping, known as the "father of hybrid rice", was born in 1930 in Beijing. {#blank#}1{#/blank#}(learn) that farmers often had poor harvests and sometimes even had a serious {#blank#}2{#/blank#}(short) of food to eat, he chose to study agriculture and graduated from Southwest Agricultureal College in 1953.

After his graduation, Yuan {#blank#}3{#/blank#}(devote) his life to finding ways to produce more rice. He realized that larger fields were not the solution {#blank#}4{#/blank#} food crisis. Instead, farmers needed to boost yields in the fields they had. Through intense effort, Yuan got over enormous technical {#blank#}5{#/blank#}(difficulty) and developed the first hybrid rice in 1974, which enabled farmers to expand their output {#blank#}6{#/blank#}(great). Yuan's rice has helped feed not just China, {#blank#}7{#/blank#} many other countries that depend on rice as well. Yuan Longping cares little for wealth or fame. Instead, he {#blank#}8{#/blank#}(make) large donations to support agricultural research.

{#blank#}9{#/blank#} impresses people most about Yuan Longping is his ongoing ability {#blank#}10{#/blank#}(fulfill) his dreams. Despite his advanced years, Yuan Longping is still young at heart and full of vision, and everyone is waiting to see what he will dream up next.

Smoking is harmful.But as soon as you quit the habit, everything will be OK,right?Wrong.

New research has found that even if you give up smoking, the damage it has done to your genes 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)—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 risks.