Believe it or not, school uniforms are absolutely not only clothes for students. They stand for the culture or beauty appreciation standard of a country. To wear uniforms has become a trend in most countries in modern society. Well, let's take a look at school uniforms in different nations. This will be interesting. And here, you will detect diverse allure (魅力)！

    The style of England school uniforms is rather classic, simple and respectable. Middle school students must wear traditional western-style school uniforms. Boys wear traditional western-style clothes, regular leather shoes and must wear neckties. Girls also wear western-style clothes, regular leather shoes and must wear bow ties. This classic clothing style unconsciously affects England students' temperament(性格)and also sense of beauty.

    Both boy and girl students in Australia are required to wear black leather shoes and white socks. They wear school uniforms all the time except the physical education, when they need to wear gym suits.

    Students in Malaysia obey rather strict rules. Girls' dresses must be long to cover the knees. Shirts must cover the elbow. Comparing with Thai students, they are much more conservative. School uniforms in most schools of China are only different in size. You can't find big differences between boys' uniforms and girls' uniforms only from the appearance. Both of them are loose sport suits.

    Mya Le Thai is a scientist studying at the University of California, Irvine. She recently discovered a process that may result in batteries that last forever. Thai said she had been discouraged that the batteries for her wireless devices degrade. Over time, they fail to charge fully.

    Thai did not like to have keep her wireless laptop connected to an electrical outlet. She decided to do something about that problem.

    At first, she and her team thought about inventing a new battery. But as they experimented, Thai discovered something that might permit lithium-ion(锂离子) batteries to last forever. Lithium-ion batteries power most wireless devices. Over time, the batteries lose the ability to hold a charge. Most of these batteries have a life span of about 7,000 charging cycles before they die.

    One of the reasons lithium-ion batteries degrade is their use of nanowires(纳米线) to carry electricity. Nanowires are extremely thin. A human hair is thousands of times thicker, for example. Nanowires are extremely efficient carriers of electricity, which makes them useful in batteries. But Thai said their thinness also makes them weak. "Nanowires break over time," she said. "That's why they lose capacity."

    But, Thai had a theory: The nanowires might last longer if covered with a material. She and the team tested her theory. The team tried many coverings for the wires. PMMA was one of them. The nanowires were coated with PMMA and cycled through charges 200,000 times. The PMMA coated nanowires showed no evidence of damage. The results suggest that batteries could last forever, without losing charging ability.

    Thai hopes to continue her research to understand why this material works so well and to see if any other material could create better results.

"It's kind of cool," she said. "I'm really glad people are showing interest in my work and not just in the work itself, but also in technology and energy."

    A 525-year-old copy of a letter by Christopher Columbus, stolen from the Vatican, was returned this week. An investigation by the United States Department of Homeland Security and the Vatican located the letter.

    “We are returning it to its rightful owner, “said U.S. ambassador to the Vatican, Callista Gingrich, at a ceremony in the Vatican Library. Columbus wrote the letter to the king and queen of Spain after discovering “The New World.” He described what he had found and requested money for another trip. His original letter was written in Spanish. But several copies of a Latin translation were made to spread news of his discovery to the royal courts of Europe and the Pope.

    One of the Latin letters, copied by Stephan Plannack in 1493, was put in the Vatican Library. Known as the Columbus Letter, it has eight pages, each about 18.5 cm by 12 cm. In 2011, an American expert in rare manuscripts received a similar looking letter. After reviewing it, he decided that it was real. The year before, the same expert had studied a Columbus Letter in the Vatican Library and suspected that it was a fake. One reason was that the stitching (针脚) marks on the letter were not the same as those on the cover. The letter in the United States, however, had the exact same stitching marks as the leather cover of the fake letter he had studied in the Vatican.

    The expert, who was not identified, contacted Homeland Security art investigators, who began working with Vatican inspectors and rare book experts. They believed that someone took the real letter out of its cover at the Vatican Library and replaced it with an artificial one. Archbishop Jean-Louis Brugues is the Vatican's chief librarian. He said, “We do not know exactly when the substitution took place. We will probably never know who the forger (伪造者) was.”

    Their investigations found that Marino Massimo De Caro, a well-known Italian book thief, had sold the real letter to a New York book dealer. De Caro is serving a seven-year prison sentence in Italy for stealing about 4,000 ancient books and manuscripts from Italian libraries and private collections. The late collector David Parsons bought the letter for $875,000 in 2004. After the investigations, his widow agreed to return the letter to the Vatican Library. Officials said the letter is now worth about $1.2 million.

    The arts, especially music, should be part of every school's lessons at every grade level. Students would be much smarter if they had some musical experience. They could improve their classroom skills, like paying attention and following directions. People develop all these skills when they learn music. Making music also lets children use their imagination. It provides students with a chance to try out their own ideas.

    Music not only makes children better students, but also gives them something positive to do. In a music program, children can be part of a band instead of joining a gang (团伙). Parents can enjoy listening to their children's music instead of seeing them glued to a computer or TV screen. In a school band, students get to be part of a team. They can get along well with old friends and make new friends through music.

    Music builds self-confidence, too. It gives children a sense of achievement and success. Making music is something for them to be proud of, and it lets kids practice performing in front of an audience. Music gives children an opportunity for self-expression, and that helps develop their self-confidence.

    Once again, music is important because it can make children better students, give them something positive to do, and build their character. That is why music should be offered in every single grade in every school.

    Britain faces social problems as lots of people are set to lose their jobs in technological revolution, Bank of England's chief economist warned.

    Andy Haldane said the so-called Fourth Industrial Revolution will make the machine replace humans to do thinking things. The dark side of the change could be a much bigger breakdown of employment than in Victorian times, with professions such as accountancy (会计) among those at risk.

    A report by the accountancy firm PwC last month warned that more than 7 million jobs in Britain had been lost over the next 20 years as technological change sweeps though workplaces.

    The majority of these are in jobs in the retail, transport and manufacturing industries. However, other traditional professional sectors could also be at serious risk.

    Economists treat the arrival of increasingly intelligent computers and robots as the fourth industrial revolution. The first was the shift from agricultural to urban societies, the second saw the widespread use of electricity and steel, and the third was the digital revolution when computers, the Internet and mobile phones were developed.

    Mr. Haldane said the hollowing-out (空洞化) experienced in the past years could be on a greater scale in the future so it is important to learn the lessons of history and ensure that people are given training to take advantage of new opportunities.

    “Jobs were effectively taken by machines of various types, there was a hollowing-out of the jobs market, which left many people for a long period out of work and struggling to make a living,” Haldane added, “That heightened social and financial tensions, and led to a rise in inequality. This is the dark side of technological revolution.”

    “That hollowing-out is going to be potentially on a much greater scale in the future, when we have machines thinking and doing the cognitive and technical skills of humans.” Mr. Haldane said professions like accountancy could be among those hardest hit by the rise of AI. But he suggested economists could escape.

    A couple of weeks ago, my oldest son, 9-year-old Hayden, came home from school and told me about his friend Katie's blog. Then he asked, "Can I start my own blog?" I thought it was a great way for him to learn new things. So I asked, "What would you want to write about?" Then we had a chat about a few choices. Eventually, Hayden decided on a particular animal species so that he could help other school kids learn about them.

    That Friday night, we set up a blog for him and Hayden's Animal Facts was born. He has posted four times so far. As we talked about starting a blog, I thought about some problems of a child blogging. Here are a few of the considerations that I had.

    Blogging isn't a popularity contest. At first, Hayden cared too much about how many views he had. After a couple of discussions, he now realizes that it's more important to come up with helpful contents for those who want to learn more about animals.

    Online security. I'm concerned about online security, so I make sure that there isn't too much personal information about him.

    The value of persistence (坚持). In so many ways, blogging is like a marathon. Keeping blogging teaches him the value of persistence.

    Writing and spelling skills. Much to my surprise, Hayden is terrible at spelling. However, he loves writing, has a great imagination and is always working on little books, so hopefully the process of blogging will help him with his writing and spelling skills.