A cellphone is one of the few things that we hold close to our faces all the time, and yet it could possibly explode - this is what made the recent Samsung's Galaxy Note 7 smart-phone accidents so shocking.

   According to technology news website The Verge, flawed（有瑕疵的）phone batteries might be to blame.

    Even if you are not a science student, you probably know that it is common sense that the anode (the negative（负的）end of the battery) and the cathode (the positive end) should never touch. If they do, the battery will short-circuit（短路）, causing a powerful electrical reaction that can destroy the battery and cause a fire.

    This is why all lithium-ion（锂离子）batteries - the kind that can be found in many of our devices like tablets and cameras - have a separator layer inside to stop the two ends from touching one another.

    But somehow, the separators in some of the Samsung phones broke, causing explosions.

    Overcharging is another problem that can make batteries heat up quickly. Fortunately, most batteries are designed to be able to automatically stop charging once they are fully charged. But again, this somehow failed to happen in some of the Samsung phones.

    The two “somehows” may sound random（随机的）and hard to explain. But they actually both come from the fact that phone producers have been pushing the limits of batteries to meet customers' demand for a longer battery life.

    According to Lynden Archer, a materials scientist at Cornell University, US, we have already achieved 90 percent of the battery life possible from a lithium-ion battery. Customers' demand that their devices get thinner has also given producers little choice but to try to put more power into thinner batteries.

     “The more energy you put into a box, the more dangerous it's going to be,” Billy Wu, a lecturer at Imperial College London, told The Guardian.

    A thinner battery also means producers have to use thinner material for separators, and thinner material has more chance of breaking.

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    We all love bank holidays. In the UK, we only get eight bank holidays in one year, and at least five of those occur around Christmas time and Easter time! A bank holiday is a British English term. This is an official day that is decided by the government, when banks, shops and offices close for the day even though it's a weekday—usually a Monday, and a lot of people have a day off work.

    Bank holidays are different in Colombia—firstly, they are called “festivos”. There are twenty festivos for the whole country in one year! In Britain ，people get more holiday allowance(津贴)than Colombians but fewer bank holidays. There can be even more festivos in Colombia, depending on which region of Colombia you live in. This is because different regions have their own holidays. For example, some regions have a patron saint(守护神) in their region, so they have an extra festivo to celebrate that saint.

    However, there are some days that are national holidays for historical reasons. There is an Independence Day celebration on July 20 every year. This is just like Bastille Day in France on July 14, or Independence Day in the United States on July 4. Other important festivos in Colombia are :Labour Day, on May 1, and Columbus Day on October 12. Columbus Day is a historical bank holiday that almost every county on the continent of America celebrates. This includes Colombia, Chile, Peru, Argentina, Mexico and the United States. It is a memorialization of the day that the Italian sailor, Christopher Columbus, first reached land on the continent in the year 1492. Many people criticize this day and say it is not something to celebrate because of the way Columbus and his teams treated the people that were already living there.

    Whenever we turn on the TV or radio, read the newspapers, or surf the Internet, we'll be surrounded by the word “diet” everywhere. We have so easily been attracted by the promise of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.

    It's obvious that diet products weaken us psychologically. They allow us to jump over the thinking stage that our weight problems lie not in actually losing the weight, but in controlling the consumption of fat. All we have to do is to swallow or recognize the word “diet” in food labels.

    What's more, diet products have greater psychological effects. Every time we have a zero-calorie drink, we are telling ourselves that we don't have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.

    As a matter of fact, the danger that diet products bring not only lies in the psychological effects they have on us, but also in the physical harm they cause. Diet foods and diet pills contain zero calories only because the diet industry has created chemicals to produce these wonder products. And they can indirectly harm our bodies because taking them instead of healthy foods means we are stopping our bodies having basic nutrients. Diet products may not be nutritional, and the chemicals that go into diet products are potentially dangerous.

    Losing weight lies in the power of minds, not in the power of chemicals. Think twice before buying diet products. Once we realize this, we will be much better able to resist diet products, therefore, prevent the psychological and physical harm that comes from using them.

    The poverty line is the minimum income that people need for an acceptable standard of living. People with incomes below the poverty line are considered poor. Economists study the causes of poverty in order to find solutions to the problem.

    As the general standard of living in the country rises, the poverty line does, too. Therefore, even with today's relatively high standard of living, about 10 percent of the people in the United States are below the poverty line. However, if these people had stable jobs, they could have an acceptable standard of living. Economists suggest several reasons why poor people do not have jobs.

    For one thing, more than half of the poor people in the United States are not qualified to work. Over 40 percent of the poor people are children. By law, children less than 16 years old cannot work in many industries. A large number of poor people are old. Many companies do not hire people over 65 years old, the normal retirement age.

    Some poor adults do not look for jobs for a variety of personal reasons: they are sick, they do not have any motivation, they have family problems, or they do not believe that they can find a job.

    Other poor people look for a job, but cannot find one. Many poor adults never went to high school. Therefore, when they look for jobs, they have few skills that they can offer.

    At the present time, the government thinks it can reduce poverty in the country in the following ways:

    First, if the national economy grows, businesses and industries hire more workers. Some of the poor who are qualified to look for jobs may find employment. Then they will no longer below the poverty line.

    Second, if society invests in the poor，the poor will become more productive.

    If the government spends money on social programs, education and training for poor people, the poor will have the skills to offer. Then it is more probable that they can find jobs.

    Finally, if the government distributes society's income differently, it raises some poor people above the poverty line. The government collects taxes from the non-poor and gives money to the poor. These payments to the poor are called welfare.

    Some economists are looking for better solutions to the poverty problem. However, at the present time, many people depend on welfare for a minimally acceptable standard of living.

    If conditions get bad enough, almost any kind of weather can become a storm.

Stormy weather can cause people to cancel their plans. It can cause major events to be postponed. And severe stormy weather can be dangerous to people, fortune and anima1.

    If you weather the storm, or ride out the storm, you survive and move on without harm or injury. For example, 1et's talk about Tornado Alley, the name for part of the central United States. During springtime, this area often has a large number of powerful tornadoes. People who live there are taught to shelter in the safest place they can find and wait for the storm to pass. People who live in Tornado Alley are used to weathering many storms!

    You can also weather a storm, but it doesn't involve actual weather. “To weather the storm” can also mean to make it through a difficult experience or trying times. So, if the stock market(股市)crashes, you might have to weather a financial storm.

    Often before a big storm, conditions are calm. The calm before the storm can happen anytime. It is the time before something bad happens. For example, at the beginning of a family reunion, the adults were all talking happily. But the older children knew it was just the calm before the storm. They've seen it happen before. The adults talk happily for about an hour. Then they start arguing about events from the past—things that should really stay buried!

    But after the storm begins and you find yourself in the middle of it, you are in the eye of the storm. In the world of weather, the eye of the storm is the calmest part, in the center of a hurricane, for example. However, in the English language, if you are in the eye of the storm, you are in the most intense part of a conflict. For example, she had no idea that walking into the meeting would put her in the eye of the storm.

    However, a brainstorm does not exist in the world of weather. To brainstorm means to try to solve a problem by talking with other people. And don't worry. If we have trouble thinking of an idea for the next program, we can always brainstorm with you!