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    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.

    When Mark Levine, an English-language instructor at Beijing's Minzu University of China, was first invited to attend a Chinese colleague's wedding in Jiangsu Province in 2016, his second year in China, the California native was ready to present a small decorative gift for the new couple as he used to do in the United States.

    However, his gesture suddenly seemed inappropriate as he realized the Chinese at the ceremony had red envelopes filled with cash to present rather than a packed gift.

    "It's a little bit embarrassing when you present something that people didn't expect to receive on certain occasions," Levine told China Daily recently. "In the US, people do that as well but only for close relatives. People would normally give things as presents, while here in China red envelopes are more commonly welcomed."

    It was the first time that the 66-year-old had discovered the Chinese rules in gift giving. He was not alone.

    British Minister of State for Transport Baroness Susan Kramer presented a watch in January to Ko Wen-je, mayor of Taipei, when she visited the city, immediately sparking headlines as she broke a long-held tradition in Chinese culture.

    A clock or watch, or zhong in Mandarin, represents "the end" in Chinese, and many associate it with death. Therefore, giving someone, especially an elder, a clock or watch implies "your time is up".

    Kramer later apologized for the mistake, but Ko also came under fire for his response as he told reporters that he had no use for the watch and would sell it for cash.

    However, some foreigners in China stand by Ko in this particular debate, such as Mark Dreyer, a British citizen who has lived and worked in China since 2007."After all, 'don't give clocks or watches to your hosts' is on page l of most China travel guides. I'm embarrassed by the lack of respect shown by the British for not even reading about the customs beforehand."

    Science fiction writers create imaginary worlds. The way things work in your imaginary worlds will be based on actual science. So it's important for you to be familiar with the scientific principles and inventions that are related to your creation. For example, if you're writing about human living on a planet with zero gravity, then you need to know the effects of zero gravity on the human body.

    Then you have to figure out the exact rules of your imaginary worlds. And you have to follow them. If humans are able to breathe underwater in Chapter 1, your character can't drown in a swimming pool in Chapter 3. The issue here is maintaining your readers' trust. That means the readers are willing to pretend along with you. If you start out with an ordinary detective novel and then throw in someone breathing underwater in the 6th chapter, you will pull the readers out of their imagination. The same thing happens if you change the rules halfway.

    Part of your preparation work for the novel is to map out its worlds in great detail. You should decide the following issues: the history of the world, the geography, what possibilities it offers, how everything works in this new reality, and how all of these factors affect the way your characters think, feel, and react to things. You don't have to tell your readers all the rules in the first chapter. But you have to let readers know enough to understand what's going on. This also allows you to work out logical problems and contradictions before you start writing.

    When you are writing, remember to make it feel real. You are inviting readers to visit a new world. They will want to be able to see, hear, feel, smell, and even taste what it's like. Whether your novel is about a world without disease or an undiscovered planet, help your readers feel like they're actually there.

    In our twenties, we find it funny when we can't remember our neighbor's cat's name or a handsome actor who starred in a famous movie. In our thirties, we jokingly call it "brain freeze". In our forties, we laugh it off as a" senior moment" and follow up with one of these old age jokes. But the reality is that there comes a point when being forgetful stops being funny and starts to seem a bit dreadful. You think, "Am I losing it？"Or worse, "Is this a sign of Alzheimer's disease（老年痴呆症）？"

    Well, don't worry. The fact that you recognize your own forgetfulness may be a very good sign, at least in terms of the possibility of your developing Alzheimer's disease（AD）. The researchers in a new study show that it's not forgetfulness but not being aware that we're forgetful that we should fear.

    The researchers began with the assumption that one common feature of Alzheimer's dis-ease is a damaged awareness of illness. And they wanted to prove their theory that the lack of awareness can be used to predict whether someone with" mild cognitive（认知的）damage" will progress to full-on AD. For the study, "mild cognitive damage" was defined as someone whose mental state was considered healthy but who had either complained of memory loss or had suffered objective memory loss.

    The researchers used existing data for 1, 062 people between the ages of 55 and 90 that had been recorded over a 12-year period. The data included brain scans, which the researchers used to look for visual signs of reduced glucose uptake（葡萄糖吸收）.It is an objective marker of the sort of reduced brain function that goes along with AD.As expected, glucose uptake was reduced in those with AD. What the researchers also discovered was that glucose uptake was reduced in those with mild cognitive damage who also showed evidence of reduced illness awareness. Finally, the researchers found that those who had reduced illness awareness were more likely to develop AD than those without.

    Cooperation at work is generally considered a good thing. The latest survey by the Financial Times of what employers need from MBA graduates found that the ability to cope with a wide variety of people was what managers have wanted most. However, managers always find ways to balance the benefits of teamwork, which helps ensure that everyone is working towards the same goal. With the dangers of "groupthink", critics are reluctant to point out a plan's drawbacks for fear of being excluded by the group. The disastrous Bay of Pigs Invasion of Cuba in 1961 was a classic case of groupthink. Skeptics were unwilling to challenge John F. Kennedy, the newly elected American president.

    Modern communication methods prove that cooperation is more frequent. Workers are constantly in touch with each other via e-mail messaging groups or mobile calls. However, does that develop, or lower performance? A new study by three American academics, tried to answer this question They set a logical problem (designing the shortest route for a travelling salesman visiting various cities) Three groups were involved: one where subjects acted independently; another where they saw the solutions posted by team members at every stage; and a third where they were kept informed of each other's views only intermittently.

    The survey found that members of the: individualist group reached the: premier solution more often than the constant cooperators but had a poorer average result The intermittent cooperators found the right result, as often as the individualists, and got a better average, solution. When it comes: to: perfect generation, giving: people a, bit of space to, a solution seems to be a great idea. Occasional cooperation can be quite beneficial: most people have benefited from a colleague's brainwave or (just as often)wise advice to avoid a, particular course of action.

    Further clues come from a book, Superminds, by Thomas, Malone of the Massachusetts Institute of Technology. He says that three factors determine the collective intelligence of cooperating groups: social intelligence (how good people were at rating the emotional states of others); the extent to which members took part equally in conversation (the more equal, the better) and the cooperation of women in the group(the higher, the better Groups ranked highly in these areas cooperated far better than others did).

    In short, cooperation may be a helpful tool but it does not work in every situation.