In London's art gallery six or seven men, mostly in their 30s, are busy painting the walls with new designs in colorful lettering and clever tricks. Tins of spray paint and beer stand on the ground. The atmosphere is not unlike that of a golf course: a mix of concentration and relaxation.

    Graffiti(涂鸦) painting is traditionally a daring hobby. Teenagers avoid security guards to put their names on trains and buses. But over the past decade that has almost disappeared from Britain's cities. Between 2007 and 2017 the number of incidents of graffiti recorded by the British Transport Police fell by 63%. A survey by the environment ministry shows that fewer places are damaged by tags(绘名) than ever. Graffiti are increasingly limited to only a few walls. In time the practice may die out entirely.

    The most obvious reason for the decline in tagging and train-painting is better policing, says Keegan Webb, who runs The London Vandal, a graffiti blog (博客). Numerous cameras mean it is harder to get away with painting illegally. And punishments are more severe. A generational change is apparent, too. Now teenagers prefer to play with iPads and video games. Those who do get involved tend to prefer street art to graffiti. And the internet helps painters win far more attention by posting pictures online than they can by breaking into a railway yard.

    Taggers and graffiti artists mostly grew up in the 1980s and 1990s. Those men are now older and less willing to take risks. "We can't run away from the police any more," says Ben Eine, who turned from tagging to street art. The hip-hop culture that inspired graffiti in the first place has faded. Video games and comic books provide more inspiration than music.

    Graffiti may eventually disappear. But for now the hobby is almost respectable. Mr Eine says he has lots of friends who used to paint trains. Now with wives and children, they paint abandoned houses at the weekend. It has become something to do on a Sunday afternoon—a slightly healthier alternative to sitting watching the football.

    Hans Christian Andersen is a Danish writer famous for his fairy tales, many of which depict (描述) characters who gain happiness in life after suffering and conflict.

    Andersen's father was a poor shoemaker and his mother worked as a washerwoman. As a child he was highly emotional, suffering all kinds of fears and shame because of his unmanly interests. Encouraged by his parents, he composed his own fairy tales and arranged puppet (木偶) theater shows. At the age of 14, Andersen moved to Copenhagen to start a career as a singer—he had a beautiful voice. He succeeded in becoming associated with Royal Theater, but he had to leave it when his voice began to change. When casually referred to as a poet, he changed his plans and began to write plays, all of which were refused.

    In 1822, Jonas Collin, the director of the Royal Theater, gave Andersen a grant to enter the grammar school at Slagelse. In 1827, Andersen gained admission to Copenhagen University, where he completed his education. In 1828 he wrote a shot story on travel, a fantastic tale in the style of the German Romantic writer, E. T. A. Hofmann. He traveled widely in Europe and remained a passionate traveler all his life.

    As a novelist, Andersen made his breakthrough with The Improvisatore. The story described a poor boy's integration (融合) into society, an Ugly Duckling theme of self-discovery. The book gained international success and remains the most widely read of all his works.

    In his early collections, Andersen returned to the stories that he had heard as a child, but gradually he started to create his own tales. Most of Andersen's works were original. Only 12 of his 156 known fairy stories drew on folktales.

    The ugliness of the hero or heroine in his stories often conceals (隐藏) great beauty，which is revealed (揭示) after misfortune. Some of Andersen's tales reveal a positive belief in the victory of the good, among them, The Snow Queen and The Ugly Duckling, and some end unhappily, like the Little Match Girl. In The Little Mermaid the author expressed a longing for the ordinary life that he had never had. Andersen never married, and he died in his home in Rolighed in 1875.

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    People tend to become more personal and hide less of themselves when using email. Researchers from Open University in Britain have found in a recent study that there are good reasons for this.

    The team of researchers asked 83 pairs of students, all strangers to each other, to solve a problem. They had to discuss this question: If only five people in the world could be saved from a world disaster, who should they be? The pairs of students had to talk over the problem either face to face or by computers. Dr. Johnson said, “They told their partners four times as much about themselves when they talked over the Internet as when they talked face to face. When the computers were fitted with cameras so that students could see each other, this limited the personal side of the conversation.”

    Generally the information was not extremely personal. It was mainly about things such as where they went to school, or where they used to live. But some students discussed their love stories, and personal childhood experiences.

    Dr Johnson believes that emailing encourages people to focus on themselves. And when they do this, they become more open, especially if there are no cameras. “If you cannot see the other person, it becomes easier to talk about yourself. This is because you are not thinking what the other person is thinking of you. So emailing has become the modern way of talking,” said Dr. Johnson. However, this style of talking is not entirely new. “In the 19th century people started to use the ‘telegraph' to communicate. Now the same kind of thing has happened and people ended up speaking more freely.”

    Dr. Johnson thinks that emailers need to know about these effects of emailing, especially when they start work in a company. “ If you don't know about them, you could find yourself saying more about yourself than you wanted to.”

    Recent summer temperatures in parts of Australia were high enough to melt asphalt. As global warming speeds up the heat and climatic events increase, many plants may be unable to cope. But at least one species of eucalyptus tree can resist extreme heat by continuing to “sweat” when other essential processes stop, a new study finds.

    As plants change sunlight into food, or photosynthesize (光合作用), they absorb carbon dioxide through pores on their leaves. These pores also release water via transpiration(蒸腾), which circulates nutrients through the plant and helps cool it by evaporation(蒸发). But exceptionally high temperatures are known to greatly reduce photosynthesis—and most existing plant models suggest this should also decrease transpiration, leaving trees in danger of fatally overheating. Because it is difficult for scientists to control and vary trees' conditions in their natural environment, little is known about how individual species handle this situation.

    Ecologist John Drake of the S.U.N.Y. College of Environmental Science and Forestry and his colleagues grew a dozen Parramatta red gum (Eucalyptus parramattensis) trees in large, climate-controlled plastic pods that separated the trees from the surrounding forest for a year in Richmond, Australia. Six of the trees were grown at surrounding air temperatures and six at temperatures three degrees Celsius higher. The researchers withheld (扣留) water from the surface soil of all 12 trees for a month to imitate a mild dry spell, then induced a four-day “extreme” heat wave: They raised the maximum temperatures in half of the pods（three with surrounding temperatures and three of the warmer ones）— to 44 degrees ℃.

    Photosynthesis ground to a near halt in the trees facing the artificial heat wave. But to the researchers' surprise, these trees continued to transpire at close-to-normal levels, effectively cooling themselves and their surroundings. The trees grown in warmer conditions coped just as well as the others, and photosynthesis rates bounced back to normal after the heat wave passed, Drake and his colleagues reported online in Global Change Biology.

    The researchers think the Parramatta red gums were able to effectively sweat — even without photosynthesis — because they are particularly good at tapping into water deep in the soil. But if a heat wave and a severe drought (干旱) were to hit at the same time and the groundwater was exhausted, the trees may not be so lucky, Drake says.

    Other scientists call the finding encouraging. “It's definitely good news,” says Trevor Keenan, an ecologist at Lawrence Berkeley National Laboratory, who was not part of the study. “It would be very interesting to know how this translates to other species,” he adds. Drake hopes to conduct similar experiments with trees common in North America.

    Nezha is the subject of the latest feature, which officially opens in cinemas in China on Friday. Nezha has earned hot reviews and is ranked higher than Monkey King: Hero is Back. It is also China's first 3D animated feature film released in IMAX format.

    Since July 13, previews of the film have taken more than 140 million yuan at the box office and the film has a score of 8.8 points (out of 10) on China's largest filming rating site, Douban. It took Jokalate Yang Yu, the film's director and screenwriter, two years to improve the script (剧本) of Nezha, and the film was in production for three years. It is the most complex animated production ever made in China. Nezha has more than 1,300 special effects shots, and it took over 20 Chinese special-effects studios, employing more than 1,600 people, to realize the film's fairy tale setting, the mysterious Dragon King's palace and a fight between fire and water. One splendid scene alone took two months to complete.

    Yang made up his mind to produce an animated film on the theme of breaking the traditional styles and changing fate to the opposite. Yang chose Nezha as his vehicle, the representative of the rebellious (叛逆的) but righteous youth. However, compared with the original novel and past animated versions, the relationships between the characters are given modern meaning. In Yang's film he is fighting prejudice: Nezha is hated and feared. But Nezha believes his fate is not predetermined and that he can choose to be a devil (恶魔) or a god.

    "After watching so many domestic animated films, only Nezha and Monkey King: Hero is Back have made me fascinated," a Weibo user commented under the promotional video.

    "Epic! I finished watching Nezha in tears. The content-rich story, vivid characters, and amazing visual effects, work together to create a 110-minute roller-coaster (过山车) watching experience," a Douban user commented.

    "Bravo! Couldn't believe a domestic animated film can be created with such a well-developed story. The image of Nezha in this film has been overturned but his rebellious spirit is well-established. I'm sure Nezha is gonna go viral this summer!" reads another comment on Douban.

Recently, my dad and I decided to take a day trip to the Florida Keys, a coral cay archipelago located off the southernmost coast of the US. I was super excited because I had not been able to go anywhere within the past nine months because of COVID-19.

With masks and hand sanitizer, we began our fun journey before sunrise. The Keys are about two hours away from where I live in Florida, so we would get there early to see the sun coming up over the ocean. On the road, we got to enjoy the Gulf of Mexico on one side and the Atlantic Ocean on the other.

When we stopped by Curry Hammock State Park, I was really amazed. The park contains 1,000 acres of land, which protects mangroves, rock land and seagrass beds that are important to the ecosyst (生态系统) in the Keys. During our time there, we were able to see some hawks flying by, and they followed the Gulf coastline of the Caribbean, migrating (迁徙) from Canada and as far south as Peru. These hawks put their wings out, "floated" up in the wide sky and then glided for long distances. After flying for thousands of miles, they still kept their fast flight patterns.

After that, we went to Key West and visited some iconic (标志性的) stops, like Duvall Street and Mile Marker 0. It was really cool because it is the very beginning of US 1, which is the longest road that runs from Key West to the Canadian border.

It was an amazing trip to the Florida Keys, and it was thrilling to have a change of scenery.