Spring and fall are usually thought to be enjoyable seasons. However, it is not always the case. {#blank#}1{#/blank#} It makes people suffer a lot from it.Why can't they find a cure（疗法）for the common cold?The answer is easy. There are actually hundreds of kinds of cold viruses（病毒） out there. You never know which one you will get.{#blank#}2{#/blank#}

    When a virus attacks your body, your body works hard to get rid of it.{#blank#}3{#/blank#} .You feel terrible because you can't breathe well, but your body is actually eating the virus.Your temperature goes up and you get a fever, but the heat of your body is killing the virus.You also have a runny nose to stop the virus from getting into your cells.You may feel very uncomfortable, but actually your wonderful body is doing everything it can to kill the cold.

    {#blank#}4{#/blank#}.In China and some other countries, for example, some people might eat chicken soup to make themselves feel better. Some people take hot baths and drink warm liquids. Other people take medicine to stop various symptoms（症状）of colds.

There is one interesting thing to note-some scientists say taking medicine when you have a cold is actually bad for you. The virus stays in your body longer because your body doesn't have a way to fight it and kill it. {#blank#}5{#/blank#}.There is a joke, however, on taking medicine when you have a cold.It goes like this: It takes about one week to get over a cold if you don't take medicine, but it takes only seven days to get over a cold if you take medicine. So you should trust the function of your body.

    When you're on the go, your best friend and resource can be your phone. In the age of smart phones, apps are like guiding stars: They can point you in the right direction for a hotel, list expenses, send postcards, and much more. When used together, these apps can be the basic travel tool, placing a wealth of information at your fingertips no matter where you are on the planet. U.S. NewsTravel has picked the essential travel apps, known for their utility and reliability. Best of all, they cost absolutely nothing.

Trip It

    Your Personal Travel Agent

    Be your own travel agent and plan every detail of your trip—from car rental to accommodating restaurants—with Trip It. You can make travel schedule by hand, or simply forward the email confirmations of your flight, rental car, train tickets, and hotels to plans.

Weather Free

    Your Go-To Meteorologist(气象学者)

    Stop trying to explain the weather forecast on the evening news (particularly when it's in a foreign language). The Weather Free app informs you (in English) of the climate in various locations. It features the local weather, and other key factors that will inform your decision about what to wear before stepping outside.

Goby

    Your Event Guru

    When you're in a foreign city, you sometimes look around and ask: Where are all the people? Goby has the answer. This app pinpoints the neighborhood hot spots (including museums, hotels, eateries, and more) in your neighborhood. But its true value comes in finding nearby events. You'll discover concerts, plays, and more right around the corner.

    If you don't have a college degree, you're at greater risk of developing memory problems or even Alzheimer's (老年痴呆). Education plays a key role in lifelong memory performance and risk for mental disorder, and it's well documented that those with a college degree possess a cognitive（认知的） advantage over their less educated counterparts in middle and old age.

    Now, a large national study from Brandeis University published in the American Journal of Geriatric Psychiatry shows that those with less schooling can significantly make up for poorer education by frequently engaging in mental exercises such as word games, puzzles, reading, and lectures.

    “The lifelong benefits of higher education for memory in later life are quite impressive, but we do not clearly understand how and why these effects last so long,” said lead author Margie Lachman, a psychologist. She suggested that higher education may encourage lifelong interest in cognitive efforts, while those with less education may not engage as frequently in mental exercises that help keep the memory agile (敏捷地).

    But education early in adulthood does not appear to be the only route to maintain your memory. The study found that intellectual activities undertaken regularly made a difference. “Among individuals with low education, those who are engaged in reading, writing, attending lectures, doing word games or puzzles once a week or more had memory scores similar to people with more education,” said Lachman.

The study, called Midlife in the United States, assessed 3,343 men and women between the ages of 32 and 84 with a mean age of 56 years. Almost 40 percent of the participants had at least a 4-year college degree. The researchers evaluated how the participants performed in two cognitive areas, verbal memory and executive function — brain processes involved in planning, abstract thinking and cognitive flexibility. Participants were given a battery of tests, including tests of verbal fluency, word recall, and backward counting.

    As expected, those with higher education said they engaged in cognitive activities more often and also did better on the memory tests, but some with lower education also did well, explained Lachman.

    “The findings are promising because they suggest there may be ways to level the playing field for those with lower educational achievement, and protect those at greatest risk for memory declines,” said Lachman. “Although we can not rule out the possibility that those who have better memories are the ones who take on more activities, the evidence is consistent with cognitive plasticity (可塑性), and suggests some degree of personal control over cognitive functioning in adulthood by adopting an intellectually active lifestyle.”

    In an industry with low margins (利润) where the traditional wisdom is led by Walmart, the key to success is lowering operating costs. A big part of those costs are in labor, so it is no surprise that the retail industry has been a leader in using more part-time workers to keep labor costs down, holding the line on wages, not training, and with few exceptions, seeing employees as a cost to be minimized. There is no doubt that these businesses fight for every dollar of margin. Unlike trend-leading hi-tech companies which spend a lot of money on employees to get them innovated, retail industry can spend very limited money on their employees.

    What researchers found was that companies were often staffing their stores far too low, and that many stores tended to perform better with higher staffing levels and were more profitable. Let's let that sink in for a minute. The stores were making more money (with all other things being equal) when they spent more on employees.

    They also found that retailers didn't do a very good job when staffing levels are just the actual demand in those stores. In fact, they set staffing levels identically across stores, even when the needs of the stores varied considerably. The average store did not appear to be understaffed, but there were enough that were understaffed and effect on overall company profitability was substantial.

    Interestingly, the same researchers persuaded the retail chain to run an experiment with them and slightly raise staffing levels to the amount that their analysis of historical data suggests would be ideal. Yes, labor costs obviously jumped when they did that, but so did profits. In retail, labor is a small percentage of costs—the biggest part is the cost of the products they sell. So, the net effect was an increase in profits of $7.4 million across 168 stores on an annual basis.

    What can we learn from this? One question worth thinking of is: How can traditional retail industry survive the increasingly severe market? Especially now with the growth of online retail, the one thing stores still have going for them is one to one customer contact with salespeople. If retailers cut that down to almost nothing, then they have effectively eliminated their competitive advantage against online stores.

Lack of sleep among children and teenagers in China has worsened in the past decade, with more than 80 percent getting insufficient sleep on school days, a new report has found.

Chinese youngsters snooze 7. 8 hours a night on average on school days, down 0. 3 hours from 2009, according to the report released on Monday by the Chinese Academy of Sciences'Institute of Psychology.

Researchers surveyed more than 15,800 students from Henan, Hebei and Guangdong provinces from April to July, asking what time they go to bed and wake up on days they take offline classes on campus.

Only 46. 4 percent of them sleep for at least 8 hours, compared with 47. 4 percent in 2009.

According to an action plan laying out measures to be taken from 2019 to 2030 to promote the health of citizens, primary school students are recommended to get a minimum of 10 hours of sleep a night. For junior high school and senior high school students, the recommended sleep durations per night are 9 and 8 hours respectively.

By this set of standards, more than 95 percent of students from primary schools, nearly 91 percent at junior high and 84 percent at senior high, did not get enough sleep on school days, heightening the risk of them developing cognitive, mental and physical health problems, the report said.

Hou Jinqin, a researcher at the National Institute of Education Sciences who co-authored the study, suggested local authorities implement measures instructed by the Ministry of Education, such as lessening academic burdens, postponing start times at school and encouraging children to be enrolled at institutions closer to home, in order to prolong sleeping hours.

In terms of the COVID - 19 outbreak's impact on sleep, she said available research overseas shows school closures forced by the COVID - 19 epidemic have added two hours of sleep to young students studying-gat home.

In China, some studies have revealed no marked differences in sleeping patterns of students before and after school reopened, she added.

Chien-Shiung Wu was a Chinese-American particle and experimental physicist who made significant contributions in the fields of nuclear and particle physics. She is best known for conducting the Wu experiment, which proved that parity (对称) is not conserved. This discovery resulted in her colleagues Tsung-Dao Lee and Chen-Ning Yang winning the 1957 Nobel Prize in Physics, while Wu herself was awarded the Wolf Prize in Physics in 1978. Her expertise in experimental physics aroused comparisons to Marie Curie.

Chien-Shiung Wu was born in a town of Jiangsu province, China, in 1912. Wu and her father were extremely close, and he encouraged her interests passionately, creating an environment where she was surrounded by books, magazines, and newspapers. Wu received her elementary school education at Mingde Women's Vocational School founded by her father.

Wu left her hometown in 1923 to go to the Suzhou Women's Normal School No 2, which was fifty miles from her home. In an era when "getting married" was considered the best destiny for women, she carved out a new path for herself through her diligent and earnest approach to learning and her thirst for knowledge.

In 1936, Chien-Shiung Wu went to the United States to pursue further studies in atomic physics. It was during this period of her education that she came to know Oppenheimer, who was teaching in the Physics Department. Under the guidance of renowned physicists such as Oppenheimer, Lawrence, and Segre, Chien-Shiung, Wu successfully completed her studies and her doctoral research. Due to the highly sensitive nature of her work, the details of her research were not revealed until the end of World War II.

In 1984, Chien-Shiung Wu returned to China from the United States. At the age of 72, she made a substantial donation of $250,000 to her hometown to support its development. Later, she also became an academician of the Chinese Academy of Sciences.

In 1997, Chien-Shiung Wu passed away. Before her death, she requested to be buried in her hometown of Suzhou. Today, her tombstone in Taicang, Suzhou, bears the inscription: "She was an outstanding global citizen and a forever Chinese."