Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer, saying studies showed a clear link. “Our suggestion is for people to increase their intake, through diet or a vitamin supplement. ” Dr.Cedric Garland said in a telephone interview.

    Garland's research team reviewed 63 studies, including several large long-term ones, on the relationship between vitamin D and certain types of cancer worldwide between 1966 and 2004.

    “There's nothing that has this ability to prevent cancer,” he said, urging governments and public health officials to do more to fortify foods with vitamin D. Garland is part of a University of California at San Diego Moores Cancer Center team that published its findings this week online in the American Journal of Public Health. Vitamin D is found in milk, as well as in some fortified orange juice, yogurt and cheeses, usually at around 100 international units(IU) a serving. People might want to consider a vitamin supplement to raise their intake to 1000 IUs per day, Garland said, adding that it was well within the safety guidelines established by the National Academy of Sciences.

    The authors said that taking more vitamin D could be especially important for people living in northern areas, which receive less vitamin D from sunshine.

    African Americans, who don't produce as much of the vitamin because of their skin colour, could also benefit significantly from a higher intake, the authors said.

    “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.

    Who is the most beautiful woman in the world? This question can't be answered as quickly as the magic mirror I answers the queen in Snow White. However, PEOPLE, a US magazine has been trying to answer that question since 1990. The magazine has its own Most Beautiful Woman every year. And last year it announced its pick for “World's Most Beautiful Woman” of 2017. It was Julia Roberts, who had won the title five times. “I am very happy,” said the Hollywood star. “I think I'm now peaking.”

    Roberts has been named “Most Beautiful” more times than anyone else. She first appeared on the magazine in 1991 at the age of 23. Roberts is perhaps not the perfect choice in all people's mind. There are so many beautiful ladies in different fields after all. But PEOPLE has its own reasons, and it's not just about her looks. Julia has never looked better. Her beauty also lies in her self-confidence and good humour. It lies in her ability to develop while keeping the best parts of herself. It lies in her talent for creating characters and telling stories that take us to new places. It lies in her beautiful smiles.

    In Julia's view, the most important secret for beauty is being happy! “Beauty is about your spirit. Be happy and live the life you want to live. That's the key to looking your best,” said Julia.

    Memory, they say, is a matter of practice and exercise. If you have the wish and really make a conscious(自觉的) effort, then you can quite easily improve your ability to remember things. But even if you are successful, there are times when your memory seems to play tricks on you.

    Sometimes you remember things that really did not happen. One morning last week, for example, I got up and found that I had left the front door unlocked all night, yet I clearly remember locking it carefully the night before.

    Memory “tricks” work the other way as well. Once in a while you remember not doing something, and then find out that you did. One day last month, for example, I was sitting in a barber(理发师) shop waiting for my turn to get a haircut, and suddenly I realized that I had got a haircut two days before at the barber shop across the street from my office.

    We always seem to find something funny and amusing in incidents caused by people's forgetfulness or absent-mindedness. Stories about absent-minded professors have been told for years, and we never get tired of hearing new ones. Unfortunately, however, absent-mindedness is not always funny. There are times when “tricks” of our memory can cause us great trouble.

    The Children's Groundwater Festival, first organized by the Groundwater Foundation 19 years ago, is celebrated every year in Nebraska, a state of the central United States in the Great Plains. After organizing the festival for 16 years, the foundation passed the program on to the local community of Grand Island, Nebraska. The festival is an annual event for fourth and fifth graders of Nebraska. It is an interesting and energetic day filled with hands­on education. Water magic, folk singers and musicians, storytellers, and bird shows add to the happy atmosphere during the festival. There are also some educational activities:

    Gooey Garbage: Children build a landfill (废物填埋场) and learn how a properly­built landfill can protect groundwater.

    Water Races: Children learn about water pollution by racing a drop of water through a model.

    Well in a Cup: By building a small aquifer (蓄水层) in a cup, children learn about aquifers and drinking water wells.

    Taster's Choice: Children drink different types of water, from tap water to bottled water. Then they are taught about the treatment process of each type of water.

    There's No New Water: Students are taught to make a special glass container and learn about the water cycle.

    The Children's Groundwater Festival not only has a great influence on Nebraska's people. So far, similar festivals have been held in nearly 40 American states, Mexico City, several provinces in Canada, and New Delhi, India. People everywhere are realizing the importance of educating young people to learn and care about groundwater.

    For more information about this festival, remember to watch our program tomorrow evening. I'll be waiting for you.

    The Healthy Habits Survey (调查) shows that only about one third of American seniors have correct habits. Here are some findings and expert advice.

    ①How many times did you brush your teeth yesterday?

    ·Finding: A full 33% of seniors brush their teeth only once a day.

    ·Step: Remove the 300 types of bacteria (细菌) in your mouth each morning with a battery-operated toothbrush. Brush gently for 2 minutes, at least twice a day.

    ②How many times did you wash your hands or bathe yesterday?

    ·Finding: Seniors, on average, bathe fewer than 3 days a week. And nearly 30% wash their hands only 4 times a day—half of the number doctors recommend.

    ·Step: We touch our faces around 3, 000 times a day—often inviting germs (病菌) to enter our mouth, nose, and eyes. Use toilet paper to avoid touching the door handle. And, most important, wash your hands often with hot running water and soap for 20 seconds.

    ③How often do you think about fighting germs?

    ·Finding: Seniors are not fighting germs as well as they should.

    ·Step: Be aware of germs. Do you know it is not your toilet but your kitchen sponge (海绵) that can carry more germs than anything else? To kill these germs, keep your sponge in the microwave for 10 seconds.