Your smartphone(智能手机) can do a lot of things. It can call people. It connects to the Internet. It enables you to play fun games. But there is a dark side to this smart little device（设备）of yours – it might also spread disease.

    “People are just as likely to get sick from their phones as from handles of the bathroom,” Jeffrey Cain, the president of the American Academy of Family Physicians, told The Wall Street Journal.

    This may be hard to believe, but scientists reached this conclusion after they tested eight random cell phones from an office in Chicago. All the tested phones showed high numbers of coliforms(大肠菌), a kind of bacteria found in excrement(粪便)，with about 2,700 to 4,200 units of the bacteria on each phone. In drinking water, the healthy limit is less than 1 unit per 100 ml of water. This bacteria can cause flu, pinkeye（红眼病）and diarrhea(腹泻).

    Although computers, keys and pens all carry germs(细菌), our smartphones get far dirtier. They touch a lot of stuff, including our hands and the inside of our pocket or purse. We take them almost everywhere: the bus, the subway and who hasn't played Angry Birds of Fruit Ninja while sitting on the toilet?

    “Some things that we think are personal are actually more public than we imagine,” Cain said.

    What's even worse is that after the phone returns from its dirty trip, it then spends most of its time cozying up to our faces. You don't think about how often you touch your phone to your face, do you? Our noses, mouths and ears are all warm and rich in grease（油脂）, an environment that germs really like.

    Compared to traditional keypads（键盘）, touch screens transmit（传播）germs more easily to hands. According to Time magazine's website, an expert in Australia warned that playing with iPads and iPhones at Apple stores is a health risk.

    So how do you keep your smartphone clean? Alcohol is effective when used to kill germs from the back and side of your phone. But it might harm the screen. There is one simple and reliable way you can reduce the germs on your phone's surface: wash your hands regularly.

    On a Friday night, a poor young artist stood at the gate of the New York railway station, playing his violin. The music was so great that many people stopped to put some money into the hat of the young man.

    The next day, the young artist came to the same place, and put his hat on the ground gracefully. Different from the day before, he took out a large piece of paper and laid it under his hat. Then he began to play the violin. It sounded more pleasant than ever.

    Soon he was surrounded with people who were attracted by the words on that paper. It said, "Last night, a gentleman named George Sang put an important thing into my hat by mistake. Please come to claim（认领）it soon."

    After about half an hour, a middle-aged man rushed through the crowd to the violinist and said, "Yes, it's you. I knew that you were an honest man and would certainly come here." The young violinist asked calmly, "Are you Mr. George Sang?" The man nodded. The violinist asked, "Did you lose something?" "It's a lottery ticket（彩票）," said the man. The violinist took out a lottery ticket on which George Sang's name was seen. "Is it?" he asked. George nodded and took the lottery ticket and kissed it, then danced with the violinist.

    The violinist was a student at an arts college and had planned to attend advanced studies in Vienna. Later his classmate asked the violinist, "At that time you needed money to pay the tuition （学费）and you had to play the violin in the railway station every day to make money. Why didn't you keep the lottery ticket for yourself?" The violinist said, "Although I don't have much money, I live happily. But if I lose honesty I won't be happy forever."

    Through our lives, we can gain a lot and lose so much. But being honest should always be with us.

    The number of insects in the world has fallen by 45 percent in the past 35 years. Scientists say this could be dangerous for humans. A report on insect numbers has been published in the journal "Science". It says the human population has doubled since 1980 while the number of insects has nearly halved. One of the biggest reasons for this loss of insects is the act of cutting down trees or burning them. Many of the places where insects live are disappearing because of new cities and land being used for farming. Another reason is global warming. Scientists say that in the UK, the number of butterflies, bees and wasps(黄蜂) has fallen by up to 60 percent. Many countries are worried about the disappearance of them.

    Scientists say the decline in insect populations will lead to many problems for humans. One of the biggest dangers is that there will be fewer insects to pollinate flowers. This means that farmers will have problems growing food. The lead author of the report, Professor Rodolfo Dirzo, said falling numbers of insects could also lead to more diseases in humans. He said rats and mice would have less food to eat so they will move to cities and bring diseases with them. Dr. Ben from London University said we needed to stop more insects from dying. He added that scientists must understand what species(物种) are winning and losing in the fight for survival. He said this knowledge would help us to protect the "helpful" insects.

    America's latest superhero Austin Perine, who calls himself President Austin, is now taking the country by storm. But he is not a typical superhero. Two things set him apart: He doesn't fight human enemies, but hunger and homelessness. Also, he's only four years old.

    Our superhero's origin story started from the day when TJ Perine, his father, took Austin to the Firehouse Ministries, a local shelter that provides housing, food and other services for the homeless. As they drove by the building, they saw a group of 25 homeless men standing on the street corner. That day, Austin used his allowance to buy each man a sandwich and handed the food out himself with his slogan, “Don't forget to show love!”

    After he returned every week for five weeks in a row, word of Austin's kindness spread through social media. Austin and TJ could feed 25 to 50 people at a time before, and now, thanks to community support, they can feed 800 to 2,000 people.

    But Austin isn't merely filling stomachs. He has been improving the lives of the homeless people he meets. On that first trip to Firehouse Ministries, TJ and Austin talked to a poor man named Raymont. The respect Austin showed for him touched 41-year-old Raymont, who regained his confidence in life and finally found a job with the help of TJ. All that was made possible because a little boy took the time to care.

    Austin's passion has become his family's calling. After raising money through a GoFundMe page, Audrey, TJ's mother established the nonprofit Show Love Foundation, dedicated to fighting homelessness. She now serves as president, and TJ oversees public relations for the foundation full time. They offer medical and mental health care as preventive steps against homelessness.

    As for President Austin, he continues to give out food, smiles, and his inspirational message of love. “It makes me feel like I'm saving the day,” he said proudly.

    Living and dealing with kids can be a tough job these days, but living and dealing with parents can be even tougher.

    If I have learned anything in my 16 years, it is that communication is very important, both when you disagree and when you get along. With any relationship, you need to let other person know how you are feeling. If you are not able to communicate, you drift apart. When you are mad at your parents, or anyone else, not talking to them doesn't solve anything.

    Communication begins with the concerns (关心) of another. It means that you can't just come home from school, go up to your room and ignore (不理睬) everyone. Even if you just say "Hi", and see how their day was for five minutes, it is better than nothing.

    If you looked up the word "communication" in a dictionary, it would say "the exchange of ideas, the conveyance (表达) of information, correspondence (通信), means of communication: a letter or a message". To maintain (保持) a good relationship, you must keep communication strong. Let people know how you feel, even if it's just by writing a note.

    When dealing with parents, you always have to make them feel good about how they are doing as a parent. If you are trying to make them see something as you see it, tell them that you'll listen to what they have to say, but ask them politely to listen to you. Yelling or walking away only makes the situation worse.

    This is an example: one night, Sophie went to a street party with her friends. She knew she had to be home by midnight after the fireworks, but she didn't feel she could just ask to go home. That would be rude. After all, they had been nice enough to take her along with them. Needless to say, she was late getting home. Her parents were mad at first, not when Sophie explained why she was late, they weren't as mad and let the incident go. Communication is the key factor here. If Sophie's parents had not been willing to listen, Sophie would have been in a lot of trouble.

    Communication isn't a one-way deal: it goes both ways. Just remember: if you get into a situation like Sophie's, telling the other person how you feel-listening is the key factor to communication.

    Have you ever fallen for a novel and been amazed not to find it on lists of great books? Or walked around a sculpture known as a classic, struggling to see why it is famous? If so, you've probably thought about the question a psychologist, James Cutting, asked himself: How does a work of art come to be considered great?

    The direct answer is that some works of art are just great: of inner superior quality. The paintings that win prime spots in galleries, get taught in classes are the ones that have proved their artistic value over time. If you can't see they're superior, that's your problem. But some social scientists have been asking questions of it, raising the possibility that artistic canons(名作目录)are little more than old historical accidents.

    Cutting, a professor at Cornell University, wondered if a psychological pattern known as the "mere­exposure effect" played a role in deciding which paintings rise to the top of the cultural league. Cutting designed an experiment to test his hunch(直觉). Over a lecture course he regularly showed undergraduates works of impressionism for two seconds at a time. Some of the paintings canonical, included in art­history books. Others were lesser known but of comparable quality were exposed four times as often. Afterwards, the students preferred them to the canonical works, while a control group liked the canonical ones best. Cuttings students had grown to like those paintings more simply because they had seen them more.

    Cutting believes his experiment casts light on how canons are formed. He reproduced works of impressionism today bought by five or six wealthy and influential collectors in the late 19th century. Their preferences given to certain works made them more likely to be hung in galleries and printed in collections. And the fame passed down the years. The more people were exposed to, the more they liked it, and the more they liked it, the more it appeared in books, on posters and in big exhibitions. Meanwhile, academics and critics added to their popularity. After all, it's not just the masses who tend to rate what they see more often more highly. Critics' praise is deeply mixed with publicity. "Scholars", Cutting argues, "are no different from the public in the effects of mere exposure."

    The process described by Cutting show a principle that the sociologist Duncan Watts calls "cumulative advantage": once a thing becomes popular, it will tend to become more popular still. A few years ago, Watts had a similar experience to Cutting's in another Paris museum. After queuing to see the "Mona Lisa" at the Louvre, he came away puzzled: why was it considered so superior to the three other Leonardos, to which nobody seemed to be paying the slightest attention?

    When Watts looked into the history of "the greatest painting of all time", he discovered that, for most of its life, the "Mona Lisa" remained in relative obscurity. In the 1850s, Leonardo da Vinci was considered no match for giants of Renaissance art like Titian and Raphael, whose works were worth almost ten times as much as the "Mona Lisa" It was only in the 20th century that "Mona Lisa rocketed to the number­one spot. What brought it there wasn't a scholarly re­evaluation, but a theft. In 1911 a worker at the Louvre walked out of the museum with the "Mona Lisa" hidden under his coat. Parisians were shocked at the theft of a painting to which, until then, they had paid little attention. When the museum reopened, people queued to see it. From then on, the "Mona Lisa "came to represent Western culture itself.

    The intrinsic (本质的) quality of a work of art is starting to seem like its least important attribute. But perhaps it's more significant than our social scientists admit. Firstly, a work needs a certain quality to reach the top of the pile. The "Mona Lisa" may not be a worthy world champion but it was in the Louvre in the first place, and not by accident. Secondly, some objects are simply better than others. Read "Hamlet" after reading even the greatest of Shakespeare's contemporaries, and the difference may strike you as unarguable.

    A study suggests that the exposure effect doesn't work the same way on everything, and points to a different conclusion about how canons are formed. Great art and mediocrity (平庸)can get confused, even by experts. But that's why we need to see, and read, as much as we can. The more were exposed to the good and the bad, the better we are at telling the difference.