South Africa is a multiethnic society encompassing a wide variety of cultures, languages, and religions. It has 11 official languages. If you want to say hello, it's "sawubona" in Zulu, and "hallo" in Afrikaans. Now, South Africa's school children may start using "ni hao" to say hello.

    The country's education minister says, the nation is adding the Mandarin language teaching in some schools. Mandarin is the official spoken language of China. That country is a major trading power for South Africa.

    A recent agreement between the two nations centers on five areas of cooperation. They include development in basic education, school books and lessons, mathematics and science, teacher training and career education and research.

    South Africa officials have not said how much they teaching Mandarin will cost. Troy Martens is an officials with South Africa's Ministry of Basic Education. She says the new partnership is extremely valuable.

    A public opinion study last year found that South Africans have mixed feelings about China. The survey showed 46 percent of South Africans do not like the spread of Chinese ideas and customs in their country, the results also showed that 60 percent dislike Chinese music, movies and television.

    But Ms Martens said Chinese trade is more important than those feelings. She said it is extremely helpful to learners in South Africa to study Mandarin as well as Chinese culture. And she said not every school will offer Mandarin.

    “Now this will not be compulsory, it will not be for every school, and it will not be for every child. But for schools that feel they have the capacity to offer Mandarin as a subject, we think it is a great opportunity for South African learners to be exposed to this international type of language,” said Martens.

    Lisette Noonan heads the 80-year-old Pretoria Chinese School in South Africa's capital. The school serves about 500 students from kindergarten to grade 12. Every student studies Mandarin.

    Ms Noonan says the school welcomes the new cooperation between South Africa and China. She said it is in the best interests of children to study Mandarin. She said that especially true with China becoming what she called “a huge economic power in the world”

    A minister was on a long flight from China to London. The first warning of the approaching problems came when the sign on the airplane flashed on: Fasten your seat belts. Then, after a while, a calm voice said, "We shall not be serving the drinks at this time as there is going to be something unexpected. Please be sure seat belt is fastened."

    Soon the storm broke out. One moment the airplane was lifted on terrific currents of air. The plane dropped as if it were about to crash.

    The minister believed that he shared the discomfort and fear of those around him. As he looked around the plane, he could see that nearly all the passengers were upset and alarmed. The future seemed ominous and many were wondering if they would make it through the storm. Then he suddenly saw a little girl. Apparently the storm meant nothing to her. She was reading a book and everything within her small world was calm orderly. Sometimes she closed her eyes and then she would read again. Then she would straighten her legs, worry and fear were not in her world. The minister could hardly believe his eyes.

    It was not surprising therefore that when the plane finally reached its destination and all the passengers hurried to leave, the minister walked up to the girl he had watched for such a long time. Having commented about the storm and the behavior of the plane, he asked why she had not been afraid. The girl replied, "Because my dad is the pilot, and he's taking me home."

    Sunscreens (防晒霜) can offer protection from two types of ultraviolet (UV) rays (紫外线): UVB, which according to the Skin Cancer Foundation, are the chief cause of sunburn and play a key role in the development of skin cancer, and UVA, which get through the skin more deeply and are largely responsible for skin aging and wrinkling, as well as skin cancer risk. The SPF (防晒指数) measurement on sunscreens refers to the UVB protection level — and the number may not mean what you think it does. SPF 15 doesn't protect you from 15% of UVB rays, just as SPF 100 doesn't protect you from 100% of the rays. In fact, as you get into the higher numbered SPF sunscreens (think: 50 and above), the difference in UVB protection is actually pretty small.

    Theoretically, though the increase in UVB protection with a super-high SPF sunscreen may be not worth considering, it may help, and certainly can't hurt, to use it — that is, as long as you do so correctly. “The only downside is whether you're giving yourself a sense of false security,” Dr. Gohara says.

    Indeed, as Dr. Wang also pointed out, when people choose increased SPFs, they may actually feel so protected by the product that they finally ignore proper sun protection. “When people use really high SPF products, they tend not to reuse, they tend to stay out in the sun much longer, and they don't use other protective measures such as clothing and hats,” he says. Regardless of any increase in protection that a high SPF may or may not offer, one thing is certain: It doesn't give your body a free pass from sunburns, aging, or cancers, and it doesn't protect you from those things for any greater length of time than the lower SPF options. Both Dr. Wang and Dr. Gohara emphasized that, no matter what the SPF is, it's important to reapply your sunscreen every two hours.

    Why not write in a foreign language? If people feel free to choose their profession, their religion, and even their sex, why not just decide which language you want to write? Ever since Jhumpa published In Other Words in Italian, people have been asking me, “Why don't you write in Italian, Tim? After all, you've been in the country 35 years. What keeps you tied to English?” Is it just a question of economic convenience?

    Certainly economics can be important. It was the factor that pushed Conrad to abandon his Polish mother tongue. If it is not possible to publish at home, or to publish there as one would wish to publish, then one is likely to go elsewhere. And if to publish elsewhere one has to change language, then some authors are willing to take that step.

    Something of the same logic has driven many writers from Africa, Asia to write in French and English in recent years. There is also the fact that people in Europe and the West are interested in the countries they grew up in. Just as in the nineteenth century, novelists like Thomas Hardy could “sell” their familiarity with peasant life to a middle-class metropolitan public, so these writers have interested us with stories that might seem common in their home countries.

    There is also a real internationalism in the decision to change language. If you have “a message” and if English is the language that offers maximum spread, then it would seem appropriate to use it.

    All these make sense. Critics tend to pay attention only to those who have made a success of writing in a new language. In April 2014, a New York Times article essentially listed young literary stars who had switched to writing in the main Western languages. At this point, the native English speaker almost begins to feel at a disadvantage for having been born into the dominant culture. Should we perhaps head for Paris, like Beckett or Jonathan Littell, just to be between two worlds? Or look for something more exotic(异国的) and have ourselves translated back into English afterward? However, one fact is that changing languages doesn't always work.

    I did write a novel in Italian. But after rereading it, I decided against it. My work lost power with the switch of language. My real subject matter still had to do with England and it was to my home culture that my books were addressed. The second language never seems to mean quite as much as the first. In any event, after my early experiment, I never went back to write in Italian. Changing language is not the only way to bring energy to your writing.

Life in the Clear

Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach. Most of them are extremely delicate and can be damaged by a simple touch. Sonke Johnsen, a scientist in biology, says, "These animals live through their life alone. They never touch anything unless they're eating it, or unless something is eating them."

And they are as clear as glass. How does an animal become see-through? It's trickier than you might think.

    The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and scatter (散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks. Both scattering and absorption make an object look different from other objects around it, so you can see it easily.

    But a transparent object doesn't absorb or scatter light, at least not very much. Light can pass through it without bending or stopping. That means a transparent object doesn't look very different from the surrounding air or water. You don't see it you see the things behind it.

    To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they contain pigments (色素) that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb light. According to Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering.

Animals are built of many different materials—skin, fat, and more—and light moves through each at a different speed. Every time light moves into a material with a new speed, it bends and scatters. Transparent animals use different tricks to fight scattering. Some animals are simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see-through. Others build a large, clear mass of non-living jelly-like (果冻状的) material and spread themselves over it.

    Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear: for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white.

Visit Chicago Children's Museum

    In brief:

    This museum offers plenty of fun hands-on activities for kids. However, this is one of the few Chicago museums not "fun for the whole family" as adults and older kids will be bored to tears.

    Address: 700 East Grand Ave. (Navy Pier), Chicago

    Phone: 312- 527-1000

    Public transportation:

    CTA bus lines # 29 (State Street), #65 (Grand Avenue), and # 66 (Chicago Avenue) all serve Navy Pier.

    Parking fees:

    · Monday through Thursday: $ 20

    · Friday through Sunday: $ 24

    · Holidays: $ 24

    Opening hours:

    · Weekdays: 10 a. m.-5 p. m

    · Weekends: 10 a. m.-8 p. m

    Entrance fees:

    ·Adults: $12

    ·Children: $12

    ·Seniors (65+): $11

    ·Children (under 5): free

    Activities:

    Located at one of Chicago's top tourist attractions, Navy Pier, the museum offers three floors of activities for kids, including:

    ·Play It Safe—all about home safety

    ·Inventing Lab—provides parts and instructions for creating things

    ·Kids Town—a playroom recreating a Chicago neighborhood where kids can pretend to do things like shopping for groceries and driving a CTA bus

    ·Climbing Schooner—a three-floor climbing building

    ·My Museum—kids get to create various pieces of art that are "all about me"

    ·Skyline—kids learn about skyscrapers and design their own buildings

    ·Tree House Trails—a play area designed like a forest

    ·Waterways—water activities showing how pumps and dams work