Scientists are debating how to limit their newly-discovered power to change genetic structure (结构). Scientists already modify the genes (基因) of farm animals and agricultural plants to make them more productive or stronger. But now they can also change genes in wild animals and plants. These genes would continue into later generations. For example, it may be possible for scientists to remove from existence the kind of mosquitoes, small flying insects, that carry the Zika virus. They might also be able to permanently remove species (物种) of plants and animals that are damaging to other species.

    In a report published last week, the U. S. National Academies of Sciences, Engineering and Medicine (NAS) said it supports continued research on this kind of gene control. But it warned that it is not possible to know what will happen when these changed plants and animals are released (释放) into the wild.

    Sixteen biologists, ethicists (伦理学家) and policymakers are on an NAS committee that is examining the issue. They say that there is value to the new technology. But, they say, there is not enough evidence to support the release of modified organisms (生物体) from the laboratory into nature.

    Many people would support stopping mosquitoes and rats from carrying diseases. But scientists say we must understand the possible scientific, ethical, legal and social results of such action before we decide whether to take it. Gene modification is spread through reproduction (繁殖).

    Changed genes will continue to spread as long as an animal or plant continues to reproduce. They cannot be limited to a farm or kept within a country's borders. Scientists are wondering what may happen if a modified organism mates with another species. They are not yet sure how the modified genes would affect the other species. It is possible that those genes could harm those creatures or even lead to their disappearance from our planet.

What's On?

Trouble in Mind

    Alice Childress won an Off-Broadway award in 1956 for this story of a black actress rehearsing a play with a white director who increasingly finds it impossible for the show to go on. Tanya Moodie and Joseph Marcell star in the play directed by Laurence Boswell.

8.30p.m. —10.30p.m, Theatre Royal. Box office: 01225 448844.

Lazarus

    Inspired by the sci-fi (science fiction) novel and movie, The Man Who Fell to Earth, this musical deals with a hero, Thomas Newton. Likely to be the autumn's hottest ticket, the score includes new songs composed by Bowie.

7.00p.m. — 9.00p.m., King's Cross theatre. Box office: 0844 871 7604.

The Gaul

    On the night of 8 February 1974, a fisherman FV Gaul disappeared off the coast of Norway. For people on board, waiting for news was great suffering. Theories began to come up, including the possibility that the boat had fallen victim to cold war. Even when he was discovered, many still felt there were questions that remained unanswered. Mark Babych directs Janet Plater's play.

8.00p.m. —11.00 p.m., Royal Shakespeare theatre. Box office: 01482 323638.

The Suppliant Women

    It is a new version of Aeschylus's 2,500-year-old play about a group of women seeking shelter who make the long journey to escape forced marriage. It was written by David Greig and directed by Ramin Gray. An ancient piece asks a contemporary question: when we are in trouble, who will open their doors and give us a harbor?

8.30p.m. —10.00p.m, Hampstead theatre. Box office: 0131 248 4848.

    London—A morning's train ride away, across the Channel, English kids talk about Liverpool's soccer team in a Paris pub. Some Parisians have even started to go to work in London. In the 19^th century, Charles Dickens compared the two great rival (竞争) cities, London and Paris, in " A Tale of Two Cities". These days, it might be A Tale of One City.

    Parisians are these days likely to smile in sympathy at a visitor's broken French and respond in polite English. As jobs grew lack at home over recent years, perhaps 250,000 Frenchmen moved across the Channel. With an undersea tunnel, they could travel between cities in three hours. The European Union freed them from immigration and customs.

    Paris, rich in beauty, is more attractive. But London feels more full of life, and more fun until the pubs shut down.

    "For me, the difference is that London is real, alive," said Trevor Wheeler, a banker.

    Chantal Jaouen, a professional designer, agrees. "I am French, but I'll stay in London," she said.

    There is, of course, the other view. Julie Lenoux is a student who moved to London two years ago. "I think people laugh more in Paris," she said.

    In fact, London and Paris, with their obvious new similarities, are beyond the old descriptions. As the European Union gradually loosened controls, Londoners flocked into Paris to shop, eat and buy property (地产).

    "Both cities have changed beyond recognition." Said Larry Collins, a writer and sometimes a Londoner. Like most people who know both well, he finds the two now fit together comfortably.

    "I first fell in love with Paris in the 1950s and it is still a wonderful place," Collins said. "But if I had to choose, it would be London. Things are so much more ordered, and life is better."

    But certainly not cheaper. In fancy parts of London, rents can be twice those on Avenue Foch in Paris. Deciding between London and Paris requires a lifestyle choice.

    Like Daphne Benoit, a French journalism student with perfect English, many young people are happy to be close enough so they don't have to choose.

    "I love Paris, my little neighborhood, the way I can walk around a centre, but life is so structured," she said. "In London, you can be who you want. No one cares."

    Though pigs may never fly, a two-year-old pig in Franschhoek, South Africa is proving they sure can paint! Meet Pigcasso, the world's first known pig artist whose masterpieces are selling for thousands of dollars to benefit Farm Sanctuary S. A. , Africa's only registered shelter for rescued farm animals.

    Joanne Lefson, who saved Pigcasso from a slaughterhouse(屠宰场) two years ago, discovered the animal's artistic talent accidentally. The South African activist says, of the numerous toys presented to keep the then four-week-old piglet entertained, it was the paintbrushes that seemed to attract her the most. "They were the only thing she didn't eat," Lefson quips.

    The rescuer decided to present the pig with canvas and paint and see what happened. To her delight, Pigcasso began creating works of art that can best be described as "abstract expressionism". Now weighing a hefty(重量）450 pounds, the celebrated pig, who loves to paint the area's scenic landscapes, has a dedicated "studio" at Farm Sanctuary S.A. where she resides. Lefson says, "I do not force her to paint. She paints when she wants to."

    Pigcasso's artwork, which has thus far been sold online, is currently on display at Cape Town's picturesque Victoria ~ Alfred Waterfront. Dubbed "Oink", the pop-up exhibition will run through March 5before heading to London-Paris-Berlin, and Amsterdam. Lefson says its main aim is to highlight the effect of animal agriculture on the planet and inspire change.

    While Pigcasso is the first pig and first nonhuman to headline an exhibition, she is not the first animal to create masterpieces. Elephants, sea lions, and even penguins have shown similar artistic talent--in exchange for some treats, of course!

China has set new rules limiting the amount of time children can play online games. The rules limit children to just three hours of online game playing a week. That is one hour between 8 p. m. and 9 p. m. on Friday, Saturday and Sunday most weeks. 

Li Zhanguo has two children aged 4 and 8. Even though they do not have smartphones, they enjoy playing online games. Like many other parents. Li is happy with new government rules. But experts say it is unclear if such policies can help prevent addiction to online games. Children might just get addicted to social media instead. In the end, experts say, parents should be the ones to set limits and support good practice. 

There has been a growing concern in China about gaming addiction among children. Government reports in 2018 found that about one in ten Chinese children were addicted to the Internet. The new rules are part of an effort to prevent young people from spending too much time on unhealthy entertainment. That includes what officials call the "irrational fan culture" 

Under the new rules, the responsibility for making sure children play only three hours a day as largely on Chinese gaming companies like Net Ease and Ten cent. Companies have set up real-name registration systems to prevent young users from going past game time limits. They have used facial recognition technology to check their identities. And they have also set up a program that permits people to report what is against the law. It is unclear what punishments gaming companies may face if they do not carry out the policies. And even if such policies are performed, it is also unclear whether they can prevent online addiction. 

A specialist treating Internet addiction expects about 20 percent of children will find ways to break the rules by borrowing accounts of their older relatives and find a way around facial recognition. In his opinion, short-video alps such as Douyin and Kuaishou are also very popular in China. They are not under the same restrictions as games.