It's been a hard time for rhinos (犀牛) lately. Recently the International Union for Conservation announced the western black rhinos had died out in the wild. It was last seen in western Africa in 2006. Now, those who work to protect the animals are trying to make sure that won't happen to other rhinos.

    19 south-central black rhinos in South Africa were driven to an area nearly 1,000 miles away, which was said to be the gentlest and quickest way to transport the animals. They were taken to a new home that would keep them safe from hunters.

    Though it is not allowed to hunt rhinos, many are still killed for their horns, which can sell for as much as $ 30,000 each. Most of them are used to make drugs as traditional medicines in Asian countries. Some people believe that the horns work well in treating pain, fever and even cancer. However, there is no medical evidence yet.

    Black rhino population began falling rapidly in the second half of the 1900s because of poaching. In fact, some people still hunt the animals at the risk of being put into prison. And many of the places where the animals used to live in were destroyed when people started building farms on the grasslands. Until the 1960s, about 65,000 black rhinos lived throughout most of Africa. Today, fewer than 5,000 are left—most of them in zoos and wildlife reserves.

    South Africa has the largest population of rhinos in the world. Poaching is an especially big problem in that country. So far, more than 340 rhinos have been killed there. Since 2003, the Black Rhino Expansion Project has been helping the south-central black rhinos in South Africa. The group works with landowners to find areas where rhinos can live safely away from hunters.

    So far, the group has successfully saved about 120 rhinos. Leaders of the project say the south-central black rhinos have seen a rise in numbers. It is hoped that, with continued support, these rhinos can escape the unfortunate result of the western black rhinos.

    There is a common belief among parents that schools are no longer interested in spelling. No school I have taught in has ever considered spelling unimportant as a basic skill. There are, however, quite different ideas about how to teach it, or how much priority(优先) it must be given over general language development and writing ability. The problem is, how to encourage a child to express himself freely in writing without holding him back with spelling.

    If spelling becomes the only point of his teacher's interest, clearly a bright child will be likely to "play safe". He will write only words within his spelling range(范围). That's why teachers often encourage the early use of dictionaries and pay attention to content rather than technical ability.

    I was once shocked to read on the bottom of a sensitive piece of writing about a personal experience: "This work is terrible! There are far too many spelling mistakes." It may have been a sharp criticism(批评) of the pupils technical abilities in writing, but it was also a sad thing for the teacher who had omitted to read the composition, which contained some beautiful expressions of the child's deep feelings. The teacher was not wrong to draw attention to the mistakes, but if his priority had centered on the child's ideas, an expression of his disappointment with the presentation would have given the pupil more hope to seek improvement.

    Each time Chinese New Year is approaching, preparations are underway around the world. Here are some Chinatowns for those outside of China wishing to mark the day.

    London

    Although it may not be as large or as long-built as others, having only become a center for the Chinese community during the 1950s, London's Chinatown is perfectly formed little firework that knows how to see in the year with a bang. Decorated with red lanterns, previous years have seen shows with acrobatics（杂技）, martial arts（武术）,dance and opera nearby.

    San Francisco

    San Francisco's Chinatown is perhaps the most famous in the United States. The city was the main entry-point for Chinese who had crossed the Pacific to the USA during the early 19th century. Between the Grant Avenue and the Stockton Street, this historic area is a local treasure, attracting more visitors per year than the Golden Gate Bridge.

    Bangkok

    With an about100-year-old history, the Thai capital's Chinatown contains complex streets offering all kinds of tasty treats, clothes, toys and antiques. Sunday market days are such a good time to get the full atmosphere of the neighborhood. The area is also known for its gold dealers, whose shops line the road.

    Mauritius

    Found in Port Louis, this Mauritian Chinatown shows the island nation's rich multicultural diversity. Established in the early years of the 20^th century by settlers from China, its tiny shops and restaurants serve locals and visitors. During the Chinese Spring Festival, the most exciting sight is the Dragon Dances on Rue Royale when Chinese musicians and dancers perform the traditional lion dances through the streets.

    On Nov. 24, near Yellowstone's northeast entrance, Spitfire, a female grey wolf, was shot and killed by a hunter as she approached a group of cottages.

    "It was a legal harvest," Abby Nelson, a wolf management specialist said. "The facts are obviously a little bit harder for people to bear, but that pack has showed signs of habituation. They just stand there and have no fear. Wolf hunters can easily pick the one they want."

    The carefree relation that some Yellowstone wolves have built with humans is reportedly attractive for hunters who look for an easy kill.

    In the overnight, yet another famous Yellowstone wolf met a violent end outside the park, officials are actively rethinking how to manage wildlife habituation.

    Smith, a wolf biologist for Yellowstone, says, "Now we're thinking of pounding them," Park officials might use fireworks, and paintball or beanbag guns when they approach humans in the park. "If you get close to people, you're going to get attacked."

    If you think this sounds cruel, you're not alone. Seeing these creatures from the roads that wind through the park not only allows tourists to witness something amazing, but also to reconnect with nature in a way that is better than any conservation campaign. But there's a growing sense that the present policy of doing nothing isn't working; more wolves will unnecessarily die and the broken record of hunters scoring easy kills will go on.

    As Smith adds, urging people to keep wolves wild when meeting them halfway is a big ask. Still, he's hopeful to preserve the world's best place to observe free­ranging wolves; it's a policy change that tourists can be involved in.

    "... perhaps Spitfire's death will accomplish some good, and we'll all come together to do a better job on managing crowds and roads and wolves in Yellowstone, " Smith said.

    The problem of robocalls has gotten so bad that many people now refuse to pick up calls from numbers they don't know. By next year, half of the calls we receive will be scams(欺诈). We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it's too little, too late. By the time these "solutions" become widely available, scammers will have moved onto cleverer means. In the near future, it's not just going to be the number you see on your screen that will be in doubt. Soon you will also question whether the voice you're hearing is actually real.

    That's because there are a number of powerful voice manipulation (处理) and automation technologies that are about to become widely available for anyone to use. At this year's I/O Conference, a company showed a new voice technology able to produce such a convincing human-sounding voice that it was able to speak to a receptionist and book a reservation without detection.

    These developments are likely to make our current problems with robocalls much worse. The reason that robocalls are a headache has less to do with amount than precision. A decade of data breaches(数据侵入)of personal information has led to a situation where scammers can easily learn your mother's name, and far more. Armed with this knowledge, they're able to carry out individually targeted campaigns to cheat people. This means, for example, that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller's, tricking you into "confirming" your address, mother's name, and card number. Scammers follow money, so companies will be the worst hit. A lot of business is still done over the phone, and much of it is based on trust and existing relationships. Voice manipulation technologies may weaken that gradually.

    We need to deal with the insecure nature of our telecom networks. Phone carriers and consumers need to work together to find ways of determining and communicating what is real. That might mean either developing a uniform way to mark videos and images, showing when and who they were made by, or abandoning phone calls altogether and moving towards data-based communications — using apps like FaceTime or WhatsApp, which can be tied to your identity.

    Credibility is hard to earn but easy to lose, and the problem is only going to get harder from here on out.

On the day the tornado hit, there was no indication severe weather was on its way—the sky was blue and the sun had been out. The first alert my husband, Jimmy, 67, and I, 65, got came around 9 p. m. , from some scrolling text on the TV Jimmy was watching. He ran upstairs to find me in our third-floor bedroom, and we changed the channel from the presidential primary debate I had been watching to our local Pensacola, Florida, station.

No sooner had we found coverage of the tornado than it was on top of us. It was the loudest thing I have ever heard. The bones of the house shook, and the power went out. Pink insulation flew into the room from a trapdoor to the attic, and the wind began to roar through the house.

I didn't know how or if we would make it down the steps. It felt as if there were no floor underneath me as the wind lifted me off my feet. I gripped the banister (栏杆) and tried to move forward, but this intense pressure held me in place.

By the time I reached the closet, the tornado had been over us for about a minute. Jimmy pushed me down to the closet floor, but he couldn't get inside himself because of the wind. I gripped Jimmy's arm. My knees and scalp were full of glass, but in that moment, I felt no pain.

All of a sudden, Jimmy lifted off his feet like people in tornadoes do in the movies. I thought he was gone. And then everything stopped. He landed on his feet. In those first quiet moments, I couldn't believe it was over. Jimmy said he'd go outside to check. "No," I said. "Don't leave me. "

Our neighbor says the storm lasted four minutes. In that time, four of the twelve town houses in our unit were completely destroyed. Of the houses left standing, ours suffered the most damage. Amazingly, none of us were severely injured.