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.

    It's common for children to grow up being told to minimize daydreaming, and instead to focus on lessons and class work. Historically, daydreaming students who go off on their own thoughts, rather than focusing on the teachers, the blackboard, or their class work, are often encouraged to stop allowing their attention to wander and to bring themselves back into the present moment. They're described as uninterested in school work and their future. Traditionally, daydreaming is seen as a practice that results in bad consequences.

    But recent studies are beginning to renounce those common beliefs by pointing out the potential benefits that daydreaming may provide. PsychCentral reports that Mary Smith, a psychological scientist and researcher, recently examined scientific writings and studies to gain a better understanding of the role of a reflective brain. These studies have shown that the brain has a network that is active when a person is daydreaming and that brain network can help memory and learning.

    Though paying attention in school is important, these results suggest that there should be time for students to daydream, too. Giving them the chance to reflect and daydream can help improve learning and development. Research also indicates that when students are permitted to daydream, they experience less anxiety and become more motivated. On the other hand, if students are warned against daydreaming, their knowledge of themselves and the world around them may suffer.

    As a result, educators are encouraged to promote a balance between outward and inward attention. A little bit of daydreaming to break up the hard focus on school activities can be beneficial, and it may help students become better, active learners.

    As for students, the lesson here is not to be afraid of doing some daydreaming. Sure, you want to pay attention to the vital information conveyed to you during your classes, but don't get discouraged if your mind wanders. A little bit of daydreaming is healthy.

    In the depths of the French Guianese rainforest, there still remain unusual groups of (土著的）people. Surprisingly, these people live largely by their own Laws and their own social customs. And yet, people in this area are in fact French citizens because it has been a colony of the French Republic since 1946. In theory，they should live by the French law. However, their remote locations mean that the French law is often ignored or unknown, thus making them into an interesting area of “lawlessness” in the world.

    The lives of these people have finally been recorded thanks to the effects of a Frenchman form Paris called Gin. Gin spent five months in early 2015 exploring the most remote comers of thin area, which sits on the edge of the Amazon rainforest, with half its population of only 250,000 living in its capital, Cayenne.

    “I have a special love for the French Guianese people. I have worked there on and off for almost ten years," says Gin. "I've been able to keep firm friendships with them. Thus I have been allowed to gain access to their living environment. I don't see it as a lawless Und. But rather I Me it as an area of freedom."

    “I wanted to show the audience a photographic record touching upon the uncivilized life," continues Gin. “I prefer to work in black and white, which allows me to show different specific worlds more clearly.”

    His black-and-white pictures present a world almost lost in time. These pictures show people seemingly pushed into a world that they were unprepared for. These local citizens now have to balance their traditional self-supporting hunting lifestyle with the lifestyle offered by the modern French Republic, which bring with it not only necessary state welfare, but also alcoholism, betrayal and even suicide.

    San Francisco Fire Engine Tours

    San Francisco Winery Tour

    Running: February 1st through April 30th

    This delicious tour goes through the city on its way to Treasure Island where we will stop at the famous Winery SF. Here you can enjoy 4 pours of some of the best wine San Francisco has to offer. (Included in ticket price)

    Departing from the Cannery: Tour times upon request

    Duration ( 时长 ) :2 hours

    Price: $90

    Back to the Fifties Tour

    Running: August 16th through August 31st

    This tour transports you back in time to one of San Francisco's most fantastic periods, the 1950s! Enjoy fun history as we take you through San Francisco for a free taste of ice cream.

    Departing from the Cannery: 5:00 pm and 7:30 pm

    Duration: 2 hours

    Price: $90

    Spooky Halloween Tour

    Running: October 10th through October 31 st Join us for a ride through the historical Presidio district. Authentic fire gear(服装) is provided for your warmth as our entertainers take you to some of the most thrilling parts of San Francisco.

    Departing from the Cannery: 6:30 pm and 8:30 pm

    Duration: 1 hour and 30 minutes

    Price: Available upon request

    Holiday Lights Tour

    Running: December 6th through December 23rd

    This attractive tour takes you to some of San

    Francisco's most cheerful holiday scenes. Authentic fire gear is provided for your warmth as you get into the holiday spirit.

    Departing from the Cannery: 7:00 pm and 9:00 pm

    Duration: 1 hour and 30 minutes

    Advance reservations required.

    One day in the gym, I asked a coach, "What's the difference between the best athletes and everyone else?" He briefly mentioned the things that you might expect: genetics, luck, talent.

    But then he added something I wasn't expecting. "At some point," he said, "it comes down to who can handle the boredom of training every day and doing the same practice over and over again."

    Most of the time people talk about getting motivated to work on their goals. As a result, I think many people get depressed when they lose focus or motivation because they think that successful people never lack motivation that they seem to be missing. But that's exactly the opposite of what this coach was saying.

    When I was an athlete, I loved going to practice the week after a big win. Who wouldn't? Your coach is happy, your teammates are excited, and you feel like you can beat anyone. As an entrepreneur, I love working when customers are rolling in and things are going well. Getting results has a way of pushing you forward.

    But what about when you're bored? What about when the work isn't easy? What about when it feels like nobody is paying attention or you're not getting the results you want? It's the ability to work when work isn't easy that makes the difference.

    If you look at the people who are consistently achieving their goals, you start to realize that it's not the events or the results that make them different. It's their commitment to the process. They fall in love with the daily practice.

    So, fall in love with boredom. Fall in love with repetition and practice. Fall in love with the process of what you do and let the results take care of themselves.

On the day the tornado hit, there was no indication severe weather was on its way—the sky was blue and the sun had been out. The first alert my husband, Jimmy, 67, and I, 65, got came around 9 p. m. , from some scrolling text on the TV Jimmy was watching. He ran upstairs to find me in our third-floor bedroom, and we changed the channel from the presidential primary debate I had been watching to our local Pensacola, Florida, station.

No sooner had we found coverage of the tornado than it was on top of us. It was the loudest thing I have ever heard. The bones of the house shook, and the power went out. Pink insulation flew into the room from a trapdoor to the attic, and the wind began to roar through the house.

I didn't know how or if we would make it down the steps. It felt as if there were no floor underneath me as the wind lifted me off my feet. I gripped the banister (栏杆) and tried to move forward, but this intense pressure held me in place.

By the time I reached the closet, the tornado had been over us for about a minute. Jimmy pushed me down to the closet floor, but he couldn't get inside himself because of the wind. I gripped Jimmy's arm. My knees and scalp were full of glass, but in that moment, I felt no pain.

All of a sudden, Jimmy lifted off his feet like people in tornadoes do in the movies. I thought he was gone. And then everything stopped. He landed on his feet. In those first quiet moments, I couldn't believe it was over. Jimmy said he'd go outside to check. "No," I said. "Don't leave me. "

Our neighbor says the storm lasted four minutes. In that time, four of the twelve town houses in our unit were completely destroyed. Of the houses left standing, ours suffered the most damage. Amazingly, none of us were severely injured.