EUROPE is home to a variety of cultural treasures. Lonely Planet, the world's largest travel guide publisher, has offered pairs of cities for culture-hungry but time poor travelers.

    London and Paris

    It takes you about two hours to travel from London to Paris by Eurostar, a high-speed railway service. The two capital cities have been competing in fashion, art and nightlife for decades — but each secretly looks up to the other.

    No one can doubt the grand and impressive beauty of Paris' Louvre Museum, but if you want to save money, you cannot skip the British Museum free to visit. Compared with London, Paris has more outdoor attractions, such as the beautiful green walkway La Promenade Plantee.

    In Paris, you'll see diners linger(逗留) over red wine. While in London, you can try some afternoon tea, eat fish and chips or salted cake.

    Vienna and Bratislava

    Austrian capital Vienna and Slovakia city Bratislava are an hour apart by train. But since they are linked by the Danube River, the best way to travel is by ship. A tour of the two cities is the perfect way to experience everything from 17^th century's Habsburg dynast splendor to sci-fi restaurants.

    Vienna is famous for Mozart and imperial palaces. You can appreciate the perfect blending(融合) of architecture and nature in the grand Scholoss Schonbrunn Palace, and reward yourself with a cup of Vienna coffee, which has made its way to the world's cultural heritage.

    Bratislava is best known for its fine dining—the remarkable UFO restaurant. You can enjoy a meat-filled dinner here in an amazing setting.

    No fashion event attracts the world quite like the Victoria's Secret Fashion Show. In November 2017, more than 55 models descended upon Shanghai for the lingerie（内衣）maker's first show in Asia. Victoria's Secret cast eight Chinese models for the show, including Liu Wen, double the number that walked in 2016.

    Liu Wen, a Chinese fashion model, started her modeline career in 2005 after competing in the reality TV show New Silk Road World Model Contest. Although she did not win the competition, Liu soon began working full-time as a model, eventually becoming a national success story after working with fashion magazines like Vogue and Harper's Bazaar that are popular in China, In 2007, she was signed to the Marilyn agency, and has since walked for Burberry. Givenchy, Chanel, Tom Ford, Proenza Schooler and Tommy Hilfiger.

    Liu walked a record 74 shows in New York, London, Milan and Paris for the autumn/ winter 2009 season, followed by 70 for spring/summer 2010, making her the second most-booked catwalk model that year. She has also achieved 15 international Vogue covers to date.

    In 2009, Liu became the first woman of Chinese origin to walk in the Victoria's Secret Fashion Show. Liu also participated in the 2010—2012 shows. She returned to the Victoria's Secret runway again in 2016.

    In the past, Liu has said that after modeling she might enjoy working as a stylist or, were the opportunity to arise, as an actress-she feels that modeling and acting have much in common, but for now she enjoys modeling and working in the fashion industry. She has stated that she knows that, as a career choice, working as a fashion designer or stylist would be “very hard work”, but she is now more seriously considering becoming a stylist because she would like “to share her fashion style -tomboyish, vintage, and comfortable-with the world”.

    Recently we made a survey and asked a large number of people to tell us about their teachers. Here is what they remembered about their teachers:

    "What teachers do I remember? Well, I remember my first teacher. She was so kind and pretty, and she told us many interesting stories."

    "I remember an English teacher —— he always had colored socks: red, green, even orange."

    "I remember a math teacher. She always dressed very well. I couldn't stop looking at her. I wanted to be like her."

    "Our chemistry teacher. He was so strict. We were afraid of him. I don't think he liked us."

    "The physics teacher was so boring. He could make us fall asleep very quickly!"

    "One year we had a really good Chinese language teacher. He was very patient and told very funny stories. He was popular with all the class. We always worked hard for him. We are his friends."

    "The PE teacher always said I was stupid. I thought teachers should give us encouragement. I am not interested in sports because of him."

    "I had one history teacher who always wore clothes of the same color. During the three years, I never saw him change."

    "I remember two teachers well. One was my music teacher who was very active, and usually had a loud voice. The other was my computer teacher who was very serious, but he really helped me when I had problems at any time."

    The world's insects are hurtling down the path to extinction, threatening a "catastrophic collapse of nature's ecosystems", according to the first global scientific review. More than 40% of insect species are declining and a third are endangered, the analysis found. The rate of extinction is eight times faster than that of mammals, birds and reptiles.

    "It should be of huge concern to all of us, for insects are at the heart of every food web,  they pollinate the large majority of plant species, keep the soil healthy, recycle nutrients, control pests, and much more. Love them or loathe them, we humans cannot survive without insects," said Prof Dave Goulson at the University of Sussex in the UK.

    The analysis, published in the journal Biological Conservation, says intensive agriculture is the main driver of the declines, particularly the heavy use of pesticides. Urbanization and climate change are also significant factors.

    One of the biggest impacts of insect loss is on the many birds, reptiles, amphibians and fish that eat insects. A small number of adaptable species are increasing in number, but not nearly enough to outweigh the big losses.

    Matt Shardlow, at the conservation charity Buglife, said: "It is gravely sobering to see this collation of evidence that demonstrates the pitiful state of the world's insect populations. It is increasingly obvious that the planet's ecology is breaking and there is a need for an intense and global effort to stop and reverse these dreadful trends."

    In 2009 a new flu virus was discovered. Combining elements of the viruses that cause bird flu and swine flu, this new virus, named H1N1, spread quickly. Within weeks, public health agencies around the world feared a terrible pandemic (流行病) was under way. Some commentators warned of an outbreak on the scale of the 1918 Spanish flu. Worse, no vaccine(疫苗) was readily available. The only hope public health authorities had was to slow its spread. But to do that, they needed to know where it already was.

    In the United States, the Centers for Disease Control and Prevention (CDC) required that doctors inform them of new flu cases. Yet the picture of the pandemic that showed up was always a week or two out of date. People might feel sick for days but wait before consulting a doctor. Relaying the information back to the central organizations took time, and the CDC only figured out the numbers once a week. With a rapidly spreading disease, a two-week lag is an eternity. This delay completely blinded public health agencies at the most urgent moments.

    Few weeks before the H1N1 virus made headlines, engineers at the Internet giant Google published a paper in Nature. It got experts' attention but was overlooked. The authors explained how Google could "predict" the spread of the winter flu, not just nationally, but down to specific regions and even states. Since Google receives more than three billion search queries every day and saves them all, it had plenty of data to work with.

    Google took the 50 million most common search terms that Americans type and compared the list with CDC data on the spread of seasonal flu between 2003 and 2008. The idea was to identify areas affected by the flu virus by what people searched for on the Internet. Others had tried to do this with Internet search terms, but no one else had as much data-processing power, as Google.

    While the Googles guessed that the searches might be aimed at getting flu information—typing phrases like "medicine for cough and fever"—that wasn't the point: they didn't know, and they designed a system that didn't care. All their system did was look for correlations(相关性) between the frequency of certain search queries and the spread of the flu over time and space. In total, they processed 450 million different mathematical models in order to test the search terms, comparing their predictions against actual flu cases from the CDC in 2007 and 2008. And their software found a combination of 45 search terms that had a strong correlation between their prediction and the official figures nationwide. Like the CDC, they could tell where the flu had spread, but unlike the CDC they could tell it in near real time, not a week or two after the fact.

    Thus, when the H1N1 crisis struck in 2009, Google's system proved to be a more useful and timely indicator than government statistics with their natural reporting lags. Public health officials were armed with valuable information.

    Strikingly, Google's method is built on "big data"—the ability of society to handle information in new ways to produce useful insights or goods and services of significant value. However,   ▲  . For example, in 2012 it identified a sudden rise in flu cases, but overstated the amount, perhaps because of too much media attention about the flu. Yet what is clear is that the next time a pandemic comes around, the world will have a better tool to predict and thus prevent its spread.

    Taking your pulse during physical activity allows you to measure how hard you are exercising. You should exercise to stay within your target heart range.

    Increasing your heart rate is a key part of exercise but it is important that your heart rate is not too high or too low. If you are a beginner, you should also be able to breathe comfortably while exercising. This will ensure that you are exercising at a level that is safe and effective for your body.

    The chart below illustrates target heart rate ranges for exercise based on the maximal heart rate for selected ages. Here are the steps for using the chart: