A report says older adults who test their minds with increasingly difficult projects have better mental ability than those who do less demanding activities.

    To keep our brains sharp as we age, we are often told to keep our minds active. As the old saying goes, “Use it or lose it.” But, there is very little scientific evidence to support than.

Denise Park is head of the university's Center for ? Vital Longevity. She designed a study in which she and her tern placed 221 healthy aging and older adults into one of three groups.

    “We asked people to learn new things, like quilting or photography. We asked other people to just do fun things like being in a social group function but were not likely to have a very large effect.”

    The subjects took part in their assigned activities for 15 hours a week over three months. At the end of that time, the researchers found that the adults who learned new skills, such as digital photography, showed the greatest improvements on memory tests.

    No improvements were seen in the results of those in the social group that did activities together like going on field trips. There were also no improvements among the third group that listened to classical music or did crossword puzzles.

    Denise Park believes one reason for improved memory in the active learning group is that its members were being pushed to learn new skills. The other groups took part in what she call receptive activities. Learning new skills may not cure age-related mental decline. But, Ms. Park thinks being mentally active slows down the process.

Denise Park says the latest information shows that the improvements lasted for at least a year. She and her team plan to do longer follow-up studies with all three groups. She also is interested in learning whether taking part in demanding mental activities delays the development of conditions like Alzheimer's disease.

    Peng Liyuan, wife of President Xi Jinping, has drawn extensive attention from people both at home and abroad for her charisma and grace. Accompanying her husband on his first overseas trip after becoming president, Peng Liyuan exhibited graceful demeanor, a pleasant personality and well-chosen dress, prompting people to coin the term “Liyuan style”.

Peng Liyuan, as one of China's best-known singers, was popular among Chinese people long before her husband became the president. Loved by her fans, she has been in touch with the people for years.

    “Liyuan style” is not only representative of a fashion idol, but also overpass cultural and diplomatic barriers. The beautiful handbags Peng has carried, and the plain but elegant and delicate dresses she has worn have become popular. Her choice of clothing, made-in-China instead of luxurious foreign brands, shows her belief in domestic dress designs.

But “Liyuan style” is not only about clothing and a woman's paraphernalia. It is also about diplomacy and promoting China's soft power. In Moscow, Peng visited a boarding school for orphans and children estranged (疏远) from their parents, encouraging them to strive for a better life, which brought out the maternal side of her character. In Tanzania, she donated sewing machines and school bags to women and children. And as a World Health Organization ambassador in the fight against AIDS, Peng is devoted to many public causes, including those relating to charity and healthcare.

    Some observers have already started saying that Peng's activities have become part of public diplomacy in China.

Also, “Liyuan style” has boosted the confidence of the Chinese people. Modem but not flashy, elegant but not arrogant, Peng has all the virtues of a Chinese woman and carries them to the international stage.

Since the 18th Party Congress and the annual sessions of the NPC and CPPCC, the country's new leadership has vowed to adopt a down-to-earth work style to connect with the people. Peng's plain but elegant style shows that thriftiness and an earthy style need not be drab and boring.

    So it can be said that Peng's first appearance on the international stage has kicked off well.

    Self-driving vehicles(车辆) will rely on cameras, sensors and artificial intelligence (人工智能) to recognize and respond to road and traffic conditions, but sensing is the most effective for objects and movement in the neighborhood of the vehicle. Not everything important in a car's environment will be caught by the vehicle's camera. Another vehicle approaching at high speed on a collision (碰撞) track might not be visible until it's too late. This is why vehicle-to-vehicle communication is undergoing rapid development. Our research shows that cars will need to be able to chat and cooperate on the road, although the technical challenges are still great.

    The usages of vehicle-to-vehicle communication contain vehicles driving together in a row, as well as safety messages about nearby emergency vehicles. Vehicles could alert each other to avoid collisions or share notices about passers-by and bicycles. From as far as several hundred metres away, vehicles could exchange messages with one another or receive information from roadside units（RSUs）about nearby incidents or dangerous road conditions through 4G network. A high level of AI seems required for such vehicles, not only to self-drive from A to B, but also to react intelligently to messages received. Vehicles will need to plan, reason, strategize and adapt according to information received in real time and to carry out cooperative behaviors. For example, a group of autonomous vehicles might avoid a route together because of possible risks, or a vehicle could decide to drop someone off earlier due to messages received, a foreseen crowding ahead.

    Further applications(应用) of vehicle-to-vehicle communication are still being researched, including how to perform cooperative behavior.

    Messages in honor of Stan Lee are pouring in on social media and other online sites.

    Lee is the creator of famous comic book characters, including Spider-Man, the Hulk, Black Panther and others. He died in Los Angeles, California, Monday. He was 95 years old.

    Marvel Entertainment and its parent company, Walt Disney, posted a video about the late writer, editor and publisher on their websites.

    Disney chairman and chief Bob Iger said Lee is "a super hero in his own right to Marvel fans around the world." He compared Lee to his comic book characters with "the power to inspire, to entertain, and to connect."

    Lee was born Stanley Martin Leiber in New York City. He began writing for comic books at 19. He wrote under the name Stan Lee. He explained that he used a false name because he wanted to write a serious and great piece of literature someday. He did not want his link with comic books to be known when that happened. But it never did happen. As the pride in his work grew, he decided to legally change his name to Stan Lee.

    Lee's comic book heroes stand apart from its competitor DC, the company that produced the seemingly perfect heroes like Superman and Wonder Woman. Lee's character often had super power, but they also had weaknesses and moral failings. In a piece for Marvel in 1969, Lee discussed the importance of creating these balanced characters. Nobody is all good, or all bad, he wrote, like Tony Stark, also known as Iron Man. He is a deeply gifted inventor with serious mental health issues; or, Peter Parker, a sensitive, brainy high-school student who has no idea how to deal with the frightening abilities he gets from the bite of a radioactive spider. Even Steve Rogers, whose Captain America was the most Superman-like of the Marvel group, had problems. Rejected as a candidate for the armed forces, he volunteers to take a "supersoldier" substance to make him a super-fighting machine.

    Actor Chris Evans has played that character in several Hollywood films. He posted a tribute to Captain America's creator on Twitter Monday. “There will never be another Stan Lee,” he wrote. Actor, writer and funny man Seth Rogen never played one of Lee's characters but he remembered him with thanks in a tweet. “Thank you Stan Lee for making people who feel different realize they are special,” he wrote.

    I admire my father for as long as I can remember. I loved the way he treated people with such respect and kindness.

    On Sundays we usually took the bus into Manhattan, where we would do interesting things, like riding the Circle Line. He would point out every landmark and tell us the history behind it. He loved to take us on the subway to Nathan's in Coney Island. Once there, he would give my sister and me each a five-dollar bill and then he would enjoy himself for the afternoon with his newspapers.

    In 1968, we went to see the movie “Oliver”, a Charles Dickens' classic story of a young orphan(孤儿) boy called Oliver. On the way home from the theater that afternoon he told us how he was raised in an orphanage(孤儿院) in New York after both of his parents died. He told us the nuns(修女) were wonderful to him and loved him like a mother would. As he grew older, he was placed in a few foster(寄养) families before he joined the Army.

    When we were teenagers, he still took us out each weekend and he would ask us to invite specific friends to join us and he would pay for them. We often went to Yankee Stadium to watch the baseball game and he bought us tickets in the least expensive seats. To keep the cost down, he waited for us in the car where he read his newspapers and then took a nap(小睡).

    He was always happy and appreciated everything he had. He loved his two little girls and later his two granddaughters. He gave so much, yet he had so little. He thought he was the richest man in the world.

    My husband David was waiting at the door when our daughter Laura and I came back. It wasn't like him to be home so early. The disbelief on his face told me that something was up.

    "Do you still have a job?"

    "No. Redundant," he answered, looking away from me.

    "OK. We'll figure it out," I replied calmly. I actually had no idea how we were going to figure it out. I immediately started to think of how we'd cut costs and who we should start to get in touch with. That night, after David had fallen asleep, I cried myself to sleep, and frequently sobbed（抽泣） in the shower in the days that followed.

    I knew the loss of David's income would have great effect on us. He had worked for the same company for twenty﹣one years and was our main income. I work at home caring for Laura, and my income is uncertain. We have debts, and job hunting takes time.

    Still, I was more concerned about my husband's emotional state than our financial situation. David's sense of identity was tied to his job. He called his parents to tell them about losing his job, but didn't say a word to anyone else for weeks. He told me that he felt like "a failure".

    It was tough for me to watch David struggle with unemployment. One night several weeks after he lost his job, David woke me just before midnight, sweating, pacing the bedroom floor and saying he didn't feel well. We spent the night in the emergency room waiting to see if he had a heart attack. Thankfully, it was just a serious anxiety attack. It was then that I knew I needed to do more to understand what my husband was going through. Here is what I learned from my own experience﹣and from talking to experts﹣on how to support your loved ones through a job loss.