“One thing I enjoy about my job is that I can work on something that is actually active,” says Game McGimsey, an American volcanologist (火山学家). Part of his job includes keeping an eye on Alaska's many active volcanoes and giving people a heads-up when a volcano might erupt (喷发).

    Like most jobs in the sciences, volcanology requires a lot of education. McGimsey received an undergraduate degree in geology at the University of North Carolina, then landed an internship (实习期) with a geologist at the USGS (美国地质勘探局) whose area of expertise was volcanoes. After earning a graduate degree at the University of Colorado, McGimsey accepted a job with the USGS and has been with the Alaska Volcano Observatory for 25 years.

    Volcanoes can influence the world in ways we might not think about. For example, on Dec. 15, 1989, a 747 jetliner (a large airplane) flew through a thick ash (灰) cloud produced by Mount Redoubt, an Alaskan volcano that hadn't erupted in 25 years. The ash caused all four engines to die, and the plane's electronics went dead.

    “The plane was within several thousand feet of flying into the mountains below when the pilots got a couple of the engines restarted and landed safely in Anchorage,” McGimsey says. It cost nearly $80 million to repair the damage to the plane.

    Such situations show just how dangerous volcanoes can be. However, volcanologists know the risks and are prepared to protect themselves.

    “There is certainly a higher danger level in volcanology than some other jobs,” McGimsey admits. “We understand how serious the danger is, and we don't like taking unnecessary chances. We avoid getting too close to an erupting volcano, because it's not worth injury or death simply to get a rock or a photograph.”

    I set out to change the lives of those who need help by joining my school's newly formed Free The Children Club. Through the determination of friends, the group has grown bigger and stronger each year. Over the past two years my friend, Alex Auclair, and I have become the leaders of the club.

    Already, after only two years of fundraising, we have accumulated over three thousand dollars and almost two thousand food items through various fundraising efforts. For example, each year a 24-hour famine (饥饿) is planned resulting in absolutely no consumption (消耗) of food. By taking part in these activities, we put ourselves in the shoes of someone living in poverty.

      No money raised goes to waste. At the end of each school year, the group takes a vote to determine where our funds will be spent and donated. Last year, we bought enough desks, chairs, supplies and textbooks for every student in a Kenyan school. This year, we plan to spend our earning helping out families in Sierra Leone.

    Poverty is a worldwide issue affecting the lives of people in not only developing countries, but also first-world countries such as Canada, the United Kingdom and Japan. Living in poverty can result in hunger, many forms of disease, lack of education, and for millions, death. It does not have to be this way. You too can form a club like the Free The Children Club or you can participate in events outside of school. Get your friends, family, even your community involved in fundraising. Do what you can to change the world.

    There might be as many as 10 million species of complex life on this planet today —— a huge number. But add up all of the complex species that ever lived and some biologists think the grand total would be about five billion. The estimate leads to an astonishing conclusion: a staggering 99% of species are not around any more. They have been driven to extinction.

    More species are joining the ranks of the extinct every year. Many scientists believe we are living through an episode of remarkably rapid extinction, on a scale that has been seen only five times in the last half a billion years.

    They call this current episode the sixth mass extinction —— a large, global decline in a wide variety of species over a relatively short period of time. And they tend to agree that humans are the main cause.

    Over-hunting, overfishing, and human-driven habitat loss are pushing many species to the brink. In fact, we have changed the planet so much that some geologists are now suggesting that we have entered a new phase in Earth's history; an epoch they call the ＂Anthropocene＂. By 2100, it is expected that humans will have caused the extinction of up to half of the world's current species.

    Because we are living through this extinction, it is relatively easy for us to study the driving forces behind it. But how do we determine what caused other mass die-offs that happened long ago? To do so we have to look at what archaeologists, palaeontologists, geologists and other scientists have concluded from the evidence they have gathered.

    The trouble is, those scientists do not always agree with one another —— even about the most recent extinction event. As well as the five-or six- mass extinctions, there have also been many smaller extinctions.

    One of these mini extinction events happened towards the end of the Pleistocene, a few tens of thousands of years ago. It is sometimes called the ＂megafaunal＂ extinction because many of the species it claimed were particularly large animals, weighing more than 97lb (44kg). However, its cause remains a debate amongst scientists.

    Many people all over the world enjoy an alcoholic drink, such as wine or beer, during dinner. Many people raise a glass of alcohol to celebrate a wedding or a birthday. And having drinks after work with friends and co-workers is called "happy hour".

    All these situations are considered "social drinking" because they happen at social events. But when does "social drinking" become problem drinking?

    According to the World Health Organization alcohol abuse kills 3.3 million people each year. That is six percent of all deaths around the world. And in a new report on alcohol use around the world, the WHO says alcohol can create dependency, or addiction, in some people. The report also warns that alcohol use can increase the risk of developing more than 200 diseases, including some kinds of cancers. And, the WHO says alcohol abuse can put people at greater risk of infectious diseases, such as tuberculosis(肺结核), pneumonia (肺炎)and HIV.

    WHO Mental Health and Substance Abuse Director Shekhar Saxena says the organization is concerned about drinking among young people between the ages 15 and 19. And it is most concerned about "binge-drinking", or an extended period of heavy drinking.

    The report concludes that worldwide 16 percent of drinkers over the age of 15 engage in binge-drinking, which is much more harmful than other kind of drinking and causes the most harm in terms of accidents, self-harm and harm to others. High income countries have the highest alcohol consumption and also the highest prevalence(盛行) of binge-drinking.

    The report also found that the highest rates of alcohol-linked deaths are in Europe, followed by the West Pacific and then the Americans. The report also finds Europe is the area with the highest alcohol use. Central and Eastern Europe are especially high.

    The World Health Organization suggests ways countries can protect people from alcohol abuse. These include increasing taxes on alcohol sales, raising the drinking age limit, and controlling the marketing of alcoholic beverages.

    Are you a morning person? You might not like the findings in this new research.

    From a lack of air and drinking water to solar radiation, theoretical Mars pioneers face any number of potential obstacles to settling on the red planet. Now, scientists have found something else to add to the list: seriously messed-up biological clocks.

    One day on Mars - which scientists refer to as the solar day, or “sol”- is 37 minutes longer than a day on Earth. A team of European scientists recently demonstrated why that could be a problem.

    Circadian rhythms are the body's natural cycles of rest and waking, which tend to follow roughly 24-hour light-dark cycles. These natural rhythms - which play a role in biological functions including brain wave activity and hormone production - can be interrupted by things like jet lag（时差）and night shift work.

    For the study, the researchers compared mice with healthy, 24-hour circadian clocks to mice with a genetic change that caused them to have shorter, 20-hour circadian clocks. The mice with healthy biological clocks were more likely to survive and reproduce, while the mice with shorter biological clocks were more likely to die off.

    What does this all have to do with space travel? Since the Martian sol is longer than a day on Earth, people with shorter circadian clocks could suffer from health problems as they try to adapt to the rotational speed of the red planet.

    Unfortunately, the body is unlikely to adapt to the new conditions or “learn” to develop a longer clock. As Loudon explained,“ Learning is not a likely option.”

    In other words: Sorry, super-early risers - NASA might not want you for the next Mars mission.

    A T-shirt a day has kept unemployment away for an American man who is making about $85,000 a year by selling advertising space on his shirt.

    Jason Sadler, 26, was once a former marketing expert from Florida. In 2008, he founded his own company, "I wear your shirt", with the idea to wear a T-shirt supplied by any company and then use social media tools to develop the company. Sadler charges the "face value" of the day for his human billboard (广告牌) service. So January 1 costs $1, while December 31 costs $365. He said this may not sound like a lot, but it adds up to $66,795 a year if he sells out every day, which he did this year. He also sells monthly sponsorships(赞助) for $1,500, adding another $18,000 to his income.

    "I walk around, take photos, wear the shirt all day … I blog about those photos, I put them up on Twitter, I change my Facebook introduction…and then I do a YouTube video. I made about $83,000 this year," he told Reuters Television. The average U.S income is about $615 a week or about $32,000 a year, according to the U.S government.

    Sadler has already begun to plan for his year 2010. He is making services larger by hiring another person to wear a shirt a day on the west coast of the United States.