The deadliest Ebola(埃博拉病毒) outbreak inrecorded history is happening right now. The outbreak is unprecedented(空前的) both in the number of people who have gotten sick and in the geographic scope. And so farit's been a long battle that doesn't appear to be slowing down.

    Ebola is both rare and very deadly. Since the first outbreak in 1976, Ebola viruses have infected thousands of people and killed roughly killed 60 percent of them. Symptoms can come on quickly and kill fast.

    The current outbreak started in Guinea sometime in late 2013 orearly 2014. It has since spread to Sierra Leone and Liberia, including somecapital cities. And one infected patient traveled on a plane to Nigeria, where he spread the disease to several others and then died. Cases have also popped up in various other countries throughout the world, including in Dallas and NewYork City in the United States.

    The Ebola virus has now hit many countries, including Guinea, Liberia, Sierra Leone, Nigeria, Senegal, and the United States. The virus, which starts off with flu-like symptoms and sometimes ends with bleeding, has infected about 6,500 people and killed more than 3,000 since this winter, according to the World Health Organization on September 30, 2014.

    There are some social and political factors contributing to the current disaster. Because this is the first major Ebola outbreak in WestAfrica, many of the region's health workers didn't have experience or trainingin how to protect themselves or care for patients with this disease.

    Journalist David Quammen put it well in a recent New York Timesarticle, “Ebola is more dangerous to humans than perhaps any known virus on Earth, except rabies(狂犬病) and HIV. Andit does its damage much faster than either.”

    Hopefully, researchers are working to find drugs, including a recent $50 million push at the National Institutes of Health. And scientists are working on vaccines(疫苗), including looking into ones that might be able to help wild chimpanzees, which are also susceptible to the disease. The first human Ebola vaccine trial is scheduled to start in the spring of 2015.

    The World Health Organization report compared the “obesity-related behaviors” for youngsters across 42 nations. And it reveals UK kids are among the laziest.

    Among teenage girls, the Scots topped the league table for most screen time, with 80 per cent spending at least two hours a day on computers. Wales came fourth with 76 per cent, and England seventh with 75 per cent. Girls in Armenia and Albania were least likely to spend hours idling online.

    Screen time figures for boys were even higher. Wales was second in the European “couch potato” league, with 85 per cent glued to their screens for at least two hours. Scotland was third with 84 per cent, and England 15th with 77 per cent. Boys in Switzerland and Portugal were least likely to dedicate two hours a day to sitting in front of a computer.

    Lead researcher Dr. Jo Inchley, from the University of St Andrews, said social media was impacting on kids' health. She said,“ We know there are risks, such as cyber bullying and impact on mental health. Also, there are longer-term impacts on physical health from being sedentary. One of the main challenges is that this kind of activity (social media and computer use) is so much part of young people's lives these days.” She said more needs to be done to get kids moving throughout the day.

    Dr. Steven Mann, research director for UK Active said the findings were “alarming”. He said, “Modern life has changed, but when teens are spending hours having fun with Facebook, Instagram and videogames, they simply aren't getting the exercise that they need. These alarming inactivity figures show that playtime is over before it has started for too many children, putting them at far greater risk of future conditions like heart disease, cancer and type 2 diabetes.”

    Tam Fry, from the National Obesity Forum, warned Brit teens are now “slaves to hand-held devices”. And the WHO warns four in five fat teens will continue to struggle with their weight throughout life. The report also shows less than half of UK youngsters consume fruit or veg daily.

    There is little rain in desert. Because deserts are so dry, they have no “quilt” to help stop the soil from going away. As a result, they may get very hot during the day with the sun shining, but don't hold the heat overnight. Many deserts can quickly get cold once the sun goes down. Some deserts can reach temperatures of over 100 degrees F during the day and then drop below freezing (32 degrees F) during the night.

    The largest hot and dry desert in the world is the Sahara Desert in Northern Africa. The Sahara is a sandy desert with great sand hills. It covers over 3 million square miles of Africa. Other large deserts include the Arabian Desert in the Middle East, the Gobi Desert in Northern China and Mongolia, and Kalahari Desert in Africa.

    Animals that live in the desert are also used to needing little water. Many get all the water they need from the food they eat. Other animals keep water that they can use later. The camel stores up fat in its hump while other animals keep something they need in their tails.

    Only certain types of plants can live in the terrible environment of the desert. You won't see a lot of tall trees in the desert. Most plants have a way to keep water in their leaves, or trunks so they can live a long time without water.

    Now deserts cover around 20% of the world's land, but they are growing. This is called desertification and is caused by different reasons including human activities. The Sahara Desert is growing larger and larger each year. What should we do with it?

    David Brown and Anne are two patients in the Adult Day Care Program at Mercy Hospitals. David Brown is seventy-two years old. He's friendly and likes to talk. He lives with his wife in the city. But David is becoming forgetful. His wife says, “He'll heat up some soup, then forget to turn off the gas.” She is sixty-one and still works. She is worried about leaving her husband alone.

    Anne is eighty and lives with her 60-year old daughter. Her daughter says that she needs a rest. “Mom follows me everywhere. She follows me when I read newspapers. I need a rest and she does, too.”

    And so, several times a week, David and Anne's families take them to the Adult Day Care Center. Many hospitals have this program, Patients come to the Center for a full or half day, from one to five days a week. All the patients live with their families and most are old people.

    Mrs. Carol Johnson is the director of the Center. She says, “We help the patients learn many things here. Patients have the chance to get out of their houses. Husbands, wives or grown children can work or have a rest. Most important of all, families are able to stay together.”

    Jordan wakes at 6 a.m. She helps her disabled mother, who is recovering from surgery for breast cancer, into the bath. Jordan has it all timed. She has a quick breakfast as her mother bathes, and returns to help her out of the bathtub and into her room. Before going to school, the 14-year-old has to walk the dog. In the evening, Jordan takes care of the family's animals and helps her mother into bed. Then she had a chance to eat dinner, do homework and wind down before going to sleep. Bedtime can be past midnight for the Florida nine-grader.

    “You have to have a certain level of maturity (成熟) to do it,” She says. As a determined student, Jordan is already planning a career in medicine.

About 1.4 million children between ages 8 and 18 are caregivers nationwide, according to American Association of Caregiving Youth (AACY). Evenly divided between girls and boys, about a third are between 8 and 11, and nearly 40% are between 12 and 15. For the young caretakers, most common are chores like shopping, fixing meals and household tasks, or keeping the family member company. Hands-on care includes helping loved ones with day-to-day activities such as bathing, dressing and toileting, getting in and out of bed and chairs, and feeding.

    AACY is a nonprofit organization supporting caregiving kids in various ways, including financial assistance, caregiving education and camps to connect young caregivers to peers. Through AACY's Care Giving Youth Project, Jordan is not alone and she is able to develop friendships with teens like her. “I felt much more relieved and less embarrassed because I wasn't the only one.” She says. “I met one of my best friends and I'm still friends with her today.”

    There is light at the end of the tunnel for Jordan. “Seeing the people I'm taking care of become better gives me a relief that things will get better,” she says. She believes that AACY will continue to help her mother when it's time for her to go to college.

    When I was a very little child, I remember watching TV and seeing other children suffer in other parts of the world. I would talk to myself, "when I grow up, when I can become rich, I'll save kids all over the world."

    At the age of 17, I began my career here in America, and by 18, I started my first charity organization. I went on to team up with other organizations in the following years, and met, helped, and even lost some of the most beautiful souls, from six-year-old Jasmina Anema who passed away in 2010 from leukemia (白血病)—her story inspired thousands to volunteer as donors, to 2012 when my grandmother lost her battle with cancer, which is the very reason and the driving force behind the Clara Lionel Foundation (CLF). We're all human. And we all just want a chance: a chance at life, a chance in education, a chance at a future, really. And at CLF, our mission is to impact as many lives as possible, but it starts with just one.

    People make it seem too hard to do charity work. The truth is, you don't have to be rich to help others. You don't need to be famous. You don't even have to be college-educated. But it starts with your neighbor, the person right next to you, the person sitting next to you in class, the kid down the block in your neighborhood. You just do whatever you can to help in any way that you can. And today, I want to challenge each of you to make a commitment to help one person, one organization, one situation that touches your heart. My grandmother always used to say, "If you've got a dollar, there's plenty to share."