How can we reduce the risk?

    There are four general approaches to dealing with volcanic dangers. We can try to keep the danger from occurring—often an impossible task. We can try to change its path or reduce its impact on existing development. We can take steps to protect future development. We can also do our best to have disaster response plans in place before they are needed.

    Removing the Threat

    Clearly, there is no way to stop an eruption. We can, however, attempt to reduce the eruption's effects by strengthening structures, for example, building protective works such as walls to make lava (熔岩) flow away from developed areas. Such efforts can be and have been successful, but are of limited use in a large-scale eruption.

    Planning for the Future

    Protecting future development from volcanic dangers is a simple task. Before building houses, we should judge the risk. If the risk seems too great, a safer location should be found. This type of planning is very effective, but all too often, people are drawn to the lush(葱郁的)，rolling land of a quiet volcano.

     Disaster Preparedness (预案)

    When a volcano comes to life, a few weeks may not be enough time to avoid a tragedy. Planning is the key to saving lives. Well before the warning signs occur, people must be educated about volcanic dangers. Escape plans must be in place. Communication between scientists, officials, the media, and the general public should be practiced. Emergency measures must be thought out and agreed upon.

    If you doubt the importance of these efforts, take another look at past volcanic tragedies, such as the eruption of Nevado del Ruiz. Communication failures left the town of Armero unprepared for escape. When a deadly mudflow came down the slope (斜坡), 21,000 people—90 percent of the town's people—died.

    Why can some people sleep through noises like a honking car or flushing toilet, while others are awakened by the lightest sound?

    To find the answer, sleep researchers at Massachusetts General Hospital conducted an unusual study of 12 self-described deep sleepers. After tests confirmed that the healthy volunteers were solid sleepers, they took part in a three-night study in the university's sleep laboratory. The participants spent the night in a big and comfortable room. But the room also included four speakers positioned near the top of the bed.

    During the night, the deep sleepers were subjected to 14 different recorded sounds, like street traffic, toilets flushing, and an airplane flying overhead. Next door, the researchers monitored their sleep patterns and brain waves.

    As expected, all of the participants slept relatively well, but there were differences in how they responded to the noisy interruptions. Some of the sleepers didn't wake up even when a sound was blasted at 70 decibels（分贝）; others were awakened by sounds at 40 or 50 decibels.

    The researchers discovered that the difference in a sleeper's reaction to noise could be predicted by the level of brain activity called "sleep spindles（纺锤体）". A sleep spindle is a burst of high-frequency brain activity coming from deep inside the brain during sleep. The source of the spindles is the thalamus（丘脑）, a part of the brain that sends sensory information to the rest of the cortex（皮层）.

    Before the study, the Massachusetts researchers theorized that the spindles are the brain's way of preventing sensory information from passing through the thalamus and waking the rest of the brain during sleep. They found that sleepers who experienced the most sleep spindles during the night were also the soundest sleepers and were least likely to be awakened by noise.

    Scientists already know that most people become lighter sleepers with age, most likely because older people experience less "slow wave sleep", which is the deepest stage of sleep. People also produce fewer sleep spindles as they age. But even when controlling for the stage of sleep a person was in, the number of sleep spindles still predicted their risk for awakening because of noise.

    More research is needed, but the findings suggest that a better understanding of sleep spindles could lead to new behavioral or drug therapies for people with sleep disorders. For example, future studies may try to determine whether diet, exercise or other behaviors may influence the number of sleep spindles a person produces during the night.

    Food is necessary for offering energy to our bodies, but sometimes we buy too much of it at the store. When your food starts to go bad, there are many other ways you can still make use of it instead of throwing it away.

    Before throwing away old bananas, you can use the peels (皮) to shine up metals and leathers. Press the peel against the surface, move it backwards and forwards and then polish clean it with an old cloth. Banana meat is also good for reducing wrinkles. Put a bit on those trouble spots, let it sit for a while, and then wash it off, and your wrinkles will go away. Lemons are great for lightening skin and hair. If you have trouble with some skin diseases, like red spots on your face, put a bit of fresh lemon juice on them and leave it overnight. You'll notice a difference in the morning. Apples will help ripen (使成熟) tomatoes quickly when they are placed together in a paper bag, and orange peels are great fire starters for your next backyard campfire party.

    If your dog or cat brings home fleas, using salt is a great way to get rid of them around the house. Just pour salt into the vacuum cleaner (真空吸尘器). Let it sit, then vacuum up the fleas. The salt can kill the fleas. Be sure to throw away the vacuum bag or empty the vacuum bin immediately, or some of the fleas can climb out.

    Beer is a great hair lightener. If you are out of lemons, try dipping your hair in beer before going outside. Just don't forget to wash it out afterwards. Milk is great for removing dirty marks, especially if it is some type of ink.

    As you can see, there are many other uses for everyday foods around the house. So next time, before throwing food away thinking it is of no use, stop for a moment and think about all their uses talked about here.

    A couple of weeks ago, my oldest son, 9-year-old Hayden, came home from school and told me about his friend Katie's blog. Then he asked, "Can I start my own blog?" I thought it was a great way for him to learn new things. So I asked, "What would you want to write about?" Then we had a chat about a few choices. Eventually, Hayden decided on a particular animal species so that he could help other school kids learn about them.

    That Friday night, we set up a blog for him and Hayden's Animal Facts was born. He has posted four times so far. As we talked about starting a blog, I thought about some problems of a child blogging. Here are a few of the considerations that I had.

    Blogging isn't a popularity contest. At first, Hayden cared too much about how many views he had. After a couple of discussions, he now realizes that it's more important to come up with helpful contents for those who want to learn more about animals.

    Online security. I'm concerned about online security, so I make sure that there isn't too much personal information about him.

    The value of persistence (坚持). In so many ways, blogging is like a marathon. Keeping blogging teaches him the value of persistence.

    Writing and spelling skills. Much to my surprise, Hayden is terrible at spelling. However, he loves writing, has a great imagination and is always working on little books, so hopefully the process of blogging will help him with his writing and spelling skills.

    A popular TV host has reportedly invested about US$ 740,000 in a project to research, preserve and promote the Hunan provincial dialect (方言). Chinese TV presenters are required to speak Mandarin, or Putonghua, as part of their work, but should dialects be allowed on air?

    Bcnu (China): TV and radio stations have the right to decide whether dialects or Mandarin will be used in their programs. The popularity of some dialects in some areas will not challenge the leading role of Mandarin in the whole country.

    Rick N (US): TV and radio broadcasters should take the lead in popularizing Mandarin. To require hosts to speak standard Mandarin is not to oppress (压制) dialects, but it only aims to restrict irresponsible use of language. I think it is unprofessional for some hosts particularly to imitate the pronunciation of dialects.

    Cooper (UK): Dialects are an important part of local culture and now many kids even don't know how to speak their dialects because of the main use of Mandarin around them. It would be a pity if future generations were unable to understand the local dialects. It would be a terrible break in cultural traditions.

    Steve (France): To attract viewers or make more money, some hosts casually use dialects. Demanding TV and radio programs use Mandarin is a move to limit strange and irresponsible use of language, whether it is Mandarin or other dialects. In this way, the decision is also a form of protection for dialects. Hearing standard Mandarin on TV and radio programs is also a basic right of audiences around the country.

My love for libraries blossomed when I joined the public library. From the age of 8 I was allowed to walk from my home to the downtown library, housed above the police station. Once the librarian gave me my first membership card, I could enjoy a range of books, which started with Little House in the Big Woods. I was addicted instantly, and this love of libraries and reading would change my life, allowing me to one day create a safe space for high-school kids, too.

By the time I was in high school, I could read the authors that we were studying in class, including Charles Dickens, Mark Twain and Emily Bronte. During the summer months, I got caught up in Gone with the Wind.

When I studied English literature at university, I thought it was time to build my own library. For the next 40 years, I continued to collect books. Until one day, I realized that all my books had become a part of the house, like wallpaper.

Toward the end of my teaching career, I became a teacher-librarian at my old high school, where I had first learned English literature. This position enabled me to regain my love and appreciation for libraries. I had a generous budget for my classes, so I searched for novels that would interest my teenage audience and hopefully spark a love of books. Fantasy, science-fiction, graphic novels -I bought almost any type of books that my students wanted to read. I bought sofas and comfortable chairs, turning the library into a safe public space, for everyone.

In doing so, I realized that the library isn't just a place to do research. They are, in fact, places that offer an opportunity to connect with the past, present and future. All that is required is a tiny bit of curiosity. Libraries are places that should be full of life. They help us adjust to the world, and their doors must be kept open to everyone for free!