“Can I hug you?” community nurse Joyce Jebambula asks with a smile as she welcomes me back to her village. “Of course,” I say as I put my arms around her. It's an unbelievable moment. Just at the height of the outbreak more than a year ago, there was an “avoid body contact” rule here. It's now been removed.

    One of the most challenging parts of reporting this outbreak over the past 18 months is that I haven't been able to touch anyone in the worst-affected countries. When Ebola(埃博拉病毒) survivors described in tears describing losing their families, I had to almost sit on my hands to avoid reaching out to comfort them.

    The outbreak was declared over in Sierra Leone on 7 November. I returned for the celebrations. But despite reaching this long-awaited milestone, all is not well.

    Ibrahim Koroma, 21, clings to (紧紧抓住) his survivor's certificate (证明) outside the home. All 17 of his family are now dead. The certificate is one of his most prized possessions. "He does not pose any risk to the community" it reads.

    Ibrahim tells me how his landlord has allowed him to stay in one of the rooms of his former family home until the end of the year. He says he doesn't know what he'll do after that. He does some part-time work, relying heavily on help from neighbors. His two little sisters and little brother died in the very room where he now sleeps. He says he often lies awake thinking about them, feeling very bad.

    The Ebola outbreak in West Africa was the worst on record. In past outbreaks there had only been a few hundred deaths and a few hundred survivors. It was thought Ebola could live for only three months. But research has now shown it can linger for at least nine months. Scientists are still trying to find how long it could be infectious.

    Want to see 16 sunrises in one day? Float in zero gravity? Be one of the few to have gazed upon our home planet from space? In just four years' time, and for an astronomical $9.5 million dollars, it's claimed you can.

    What's being billed as the world's first luxury space hotel, Aurora Station, was announced Thursday at the Space 2.0 Summit in San Jose, California. Developed by US-based space technology start-up Orion Span, the fully modular space station will host six people at a time, including two crew members, for 12-day trips of space travel. It plans to welcome its first guests in 2022.

    “Our goal is to make space accessible to all,” Frank Bunger, CEO and founder of Orion Span, said in a statement. “Upon launch, Aurora Station goes into service immediately, bringing travelers into space quickly and at a lower price point than ever seen before.” While a $10 million trip is outside the budget of most people's two-week vacations, Orion Span claims to offer a real astronaut experience.

    During their 12-day adventure, the super-rich travelers will fly at a height of 200 miles above the Earth's surface in Low Earth Orbit, or LEP, where they will see incredible views of the blue planet. The hotel will orbit Earth every 90 minutes, which means guests will see around 16 sunrises and sunsets every 24 hours.

    Activities on board include taking part in research experiments such as growing food while in orbit--which guests can take home for a super-smug souvenir—and soaring over their hometown. Guests can have live video chats with their less-fortunate loved ones back home via high-speed wireless Internet access and, upon return to Earth, will be greeted with a specially arranged hero's welcome. While enjoying the thrills of zero gravity, the travelers will be able to float freely through the hotel, taking in views of the northern and southern Aurora from the station's windows.

    DepositsHYPERLINK “https://www.orionspan.com/aurora-station-reservations”（订金）are already being a HYPERLINK“http://www.orisonspan.com/aurora-station-reservations”cHYPERLINK“http://www.orionspan.com/aurora-station-reservations” cepted for future stays on the space hotel. The $80,000 is fully returnable, should applicants find themselves unable to rise to the full $9.5 million. Travelers will complete a three-month Orion Span Astronaut Certification (OSAC) program before takeoff. Orion Span has a team of space industry veterans who together have more than 140 years of human space experience.

    Would you buy a car that released calming smells into the air when you are stuck in heavy traffic? Would you buy a robot that smells like a human being?

    Many people have seen the 3-D computer-made environments of virtual reality (VR). Now these virtual worlds will not just look and sound real. Researchers have created VR environments that even smell like the real things. With the new technology, users open a virtual door and step into a new environment, like a rainforest. After they enter this virtual world, special equipment releases forest-like smells into the air to make the experience seem more real.

    Suzanne Fisher-Murray said, “it is a really wonderful experience that you have because you're exploring this environment and you have smells with it.”

    In the United States, Smell-O-Vision was designed to provide smells during the showing of a movie. The Smell-0-Vision system was once popular in the 1960s. Now, Emanuela Maggioni says it is close to becoming popular again. “The connection with emotions, memories, and…the sense of smell,” Maggioni said. “It is unbelievable what we can do with technology.”

    The uses for smell technology are not just limited to films and the performing arts. Researchers showed a computer program where users could imagine themselves driving a car. The system included a special smell-spraying machine. Dmitrijs Dmitrenko said, “We want to deliver the smell of lavender（薰衣草）every time the person drives over the speed limit. We choose lavender because it's a very calming smell.”

    Scientists are experimenting with smell instead of sounds or image-based alerts on telecommunications equipment. And businesses are already using smell to influence people's behavior. “Not only.…in stores…But on the other side, you can create and stimulate immediate buying,” Maggioni said. “So you're in a library and you smell coffee and actually you are unconsciously having the need to drink a coffee.”

    Celeste Ng,a new writer,has gained recognition for her first novel,Everything I Never Told You.

    Ng's parents came from Hong Kong,China in the 1960s.Ng was born in America and grew up in Pittsburgh, Pennsylvania,and Shaker Heights,Ohio,in a family of scientists.Celeste went to Harvard University and earned an MFA from the University of Michigan,where she won the Hopwood Award.

    Although her novel is not about race,the characters are Asian.The main character is Lydia,a teenage girl,who is the favorite of three children born to a white mother and a Chinese-American father.The story is about Lydia's disappearance,and the emotions the family goes through as the mystery unfolds.The whole family deals with sorrow, regret,and exposed secrets as they search for their lost daughter.

    Though the characters in this story are Asian,Ng says she didn't really want to include Asian characters.She was afraid people would think the story was about real people in her life.Because she grew up in America and doesn't speak Chinese,she was actually surprised that she included.Asian characters in the book.

    The book has taken off,especially on Amazon,where it won the Editor's Pick for No.1 Best Book of the Year in 2014.Ng is still getting used to the attention,saying she is still amazed when people tell her they have read her book. With so many readers,it's safe to say this is a book you should read.But if you're looking for a simple mystery,this book might not be for you.Most readers warn that you should not read this book unless you're prepared to cry.

    The bristlecone pine (狐尾松) is one of the longest-living things on Earth. These trees, with their strangely shaped branches, can live up to 5,000 years, but experts worry that a warming climate in some areas may threaten its future.

    Researchers say warmer weather is permitting a similar kind of tree, the limber pine (柔枝松), to take over good growing places from the ancient bristlecone. They say the tree is being forced out of mountainous areas where it grows.

    Scientists at the University of California, Davis, say climate change is causing the trees to compete with each other.

    Brian Smithers led the research project. “The limber pine is taking all the good spots,” he said.

    Bristlecone pines grow in high mountain forests in eastern California, Nevada and Utah. In the mountains, they face high winds and extreme temperatures.

    The difficult conditions leave the trees with twisted(变形的) branches and shapes. To survive long periods without water, parts of the trees die, including much of their outer bark (外皮). This makes the trees appear dead, except for small green pine needles. They show that the tree is indeed alive.

    The oldest living bristlecone pine is somewhere in California. It is not marked in any special way, so that people do not try to damage it.

    The limber pine is the bristlecone's distant relative and competitor, which can also live a long time — up to 2,000 years. Researchers say it is found at lower elevations (纬度), where temperatures are warmer.

    The scientists at the University of California, Davis, recently released the results of a three-year study. Their research centered on trees that have started growing in the last 50 years in the Great Basin area of California's White Mountains. The researchers found that most of the trees growing at higher elevations were limber pines.

    Smithers said, “It's very strange to see it charging higher up and not see the bristlecone charging up the mountain slopes ahead of the limber pine.”

    Smithers said the bristlecones are not in danger of disappearing, but he thinks they could be forced out of some places where they have grown for thousands of years.

Training the Brain

    People who can accomplish unbelievable tasks, such as memorizing thousands of random numbers in under an hour, state that they just have normal brains. Some memory superstars compete in Olympic-like World Memory Championships. These mental athletes, or MAs for short, can memorize names of dozens of strangers in a few minutes or any poem handed them. Ed Cooke, a 24-year-old MA, explains they see themselves as participants rescuing the long-lost art of memory training. These techniques existed not to recall useless information, but to cut into the brain basic text and ideas.

    A study in the journal Nature examined eight people who finished near the top of the World Memory Championships. The scientists examined whether their brains were fundamentally different from everyone else's or whether they were simply making better use of memorizing abilities we all possess. They put the MAs and control subjects into brain scanners and had them memorize numbers and photographs. The result surprised everyone. The brains of the MAs and those of the control subjects were indistinguishable. On every test, the MAs scored in the normal range. However, when the scientists examined what part of the brain was used during a memory activity, they found the MAs relied more heavily on areas in the brain involved in spatial memory.

    MAs offer an explanation: anything can be fixed upon our memories and kept in order by constructing a building in the imagination and filling it with pictures of what needs to be recalled. Dating back to the fifth century, the building is called a memory palace. Even as late as the fourteenth century, when there were copies of any text, scholars needed to remember what was read to them. Reading to remember requires a different technique than speed reading. If something is made memorable, it has to be repeated. Until relatively recently, people read only a few books intensively (细致地) again and again, usually aloud. Today we read extensively, usually only once and without continuous focus.

    So the great difference is the ability to create impressive pictures in mind and to do it quickly. Using memory palaces, MAs create memorized pictures. For example, recombine the pictures to form unforgettable scenes such as the ways through a town. One competitor used his own body parts to help him memorize a 57,000-word dictionary.

    Anyone who wishes to train the mind needs first to create fantastical palaces in the imagination. Then they should cut each building into cubbyholes for memories. In a short amount of time, they will notice improvement with remembering things. To keep the skill sharp, MAs deliberately empty their palaces after competitions, so they can reuse them and they recommend that beginners do the same.