Hey, ladies! It's summer again and it's time for a new you! No more make-up, no more pretending! Yes, that's right! It's time to stop making ourselves beautiful for the camera, and start posting confident pictures without all the make-up and extra tricks we add onto ourselves in the hope of appearing more attractive and beautiful. Because believe it or not, we already are!

    After we wash our face and go to bed, it is not so perfect. You know it the face we should confidently be showing to the world! Who cares if you have pimples（面痕）or your eyes look small, or if you have crow's feet? Guess what? Those are actually what make you such a beautifully grown woman. And any person who doesn't think so is just not as strong as you.

    Nowadays we tend to do anything and everything to make us look as young and perfect as possible. Yet the truth is, by doing this, we are actually making our true skin get worse and badly affected by all the junk we put on. We are making ourselves believe that by changing our appearance we will be more accepted and seem more attractive to other people. And yet, our final goal is to find that without all of the make-up. What kind of twisted（扭曲的）game are we really playing with ourselves?

    So I would like to make a suggestion for all women out there to give yourself a break at least this summer. Take a couple of pictures without all of that make-up on. You don't need it every single day, especially not this hot summer! You'll be surprised that the more confident you are about showing the real side of you, the more attractive you will be to everyone else.

    Yes, the saying, “Beauty comes from within” is an old one, definitely still holds some truth today. So be brave, carefree, and make-up free! Let the world see you for who you really are!

    People love cellphones, which is why nine in ten Americans own one. But does heavy use of cellphones pose a risk of cancer? This question has caused controversy for many years. A new study in rats now augments those concerns. Its data linked long-term, intense exposure to radiation from cellphones with an increased risk of cancer in the heart or brain. The results have yet to be confirmed, the authors note.

    Indeed, although the rat study found a link between cellphone radiation and cancer, it offers no clues to why such a link might exist, notes Jonathan Samet. He teaches preventative medicine and directs the Institute for Global Health at the University of Southern California in Los Angeles. Still, he calls the new study's findings “significant”.They could lead to studies researching how cellphone radiation might cause cancer, he says.

    Phone signals are relayed between cell towers and cellphones via radio waves. This radio frequency—or RF—radiation is a type known as non-ionizing (非电离的).Unlike X-rays, non-ionizing radiation does not deposit enough energy into cells to release electrons from atoms or molecules, producing ions. So it tends to be far less harmful than ionizing radiation, such as X-rays. But that does not mean radio waves might not cause harm.

    In very large doses (量) this radiation will heat the body and cause tissue damage. But it's not yet known what much lower RF levels might do, such as those from cellphone use. Five years ago, the World Health Organization's International Agency for Research on Cancer, or IARC, concluded that cellphone use “is possibly carcinogenic (致癌的)”.

    Its conclusion was based on what little research data was available at that time. But notice that IARC was not certain. It said only that phone use might “possibly” cause cancer. So scientists at the National Toxicology Program, or NTP, investigated further.

    Chinese scientists recently have produced two monkeys with the same gene, Zhong Zhong and Hua Hua, using the same technique that gave us Dolly the sheep. These monkeys are not actually the first primates(灵长类)to be cloned. Another one named Tetra was produced in the late 1990s by embryo(胚胎)splitting, the division of an early-stage embryo into two or four separate cells to make clones. By contrast, they were each made by replacing an egg cell nucleus(卵原子核)with DNA from a differentiated body cell. This Dolly method, known as somatic(躯体的) cell nuclear transfer(SCNT), can create more clones and allows researchers greater control over the edits they make to the DNA.

    Success came from adopting several new techniques. These included a new type of microscopy(显微术) to better view the cells during handling or using several materials that encourage cell reprogramming, which hadn't been tried before on primates. Still, the research process proved difficult, and many attempts by the team failed. Just two healthy baby monkeys born from more than 60 tested mothers. This leads to many researchers' pouring water on the idea that the team's results bring scientists closer to cloning humans. They thought this work is not a stepping stone to establishing methods for obtaining live born human clones. Instead, this clearly remains a very foolish thing to attempt, and it would be far too inefficient, far too unsafe, and it is also pointless.

    But the scientists involved emphasize that this is not their goal. There is now no barrier for cloning primate species, thus cloning humans is closer to reality. However, their research purpose is entirely for producing non-human primate models for human diseases; they absolutely have no intention, and society will not permit this work to be extended to humans. Despite limitations, they treat this breakthrough as a novel model system for scientists studying human biology and disease.

    When you're on the go, your best friend and resource can be your phone. In the age of smart phones, apps are like guiding stars: They can point you in the right direction for a hotel, list expenses, send postcards, and much more. When used together, these apps can be the basic travel tool, placing a wealth of information at your fingertips no matter where you are on the planet. U.S. News Travel has picked the essential travel apps, known for their utility and reliability. Best of all, they cost absolutely nothing.

    Trip It

    Your Personal Travel Agent

    Be your own travel agent and plan every detail of your trip-- from car rental to accommodating restaurants-- with Trip It. You can make travel schedule by hand, or simply forward the email confirmations of your flight, rental car, train tickets, and hotels to plans.

Weather Free

    Your Go-To Meteorologist(气象学者)

    Stop trying to explain the weather forecast on the evening news (particularly when it's in a foreign language.) The Weather Free app informs you (in English) of the climate in various locations. It features the local weather, and other key factors that will inform your decision about what to wear before stepping outside.

    Goby

    Your Event Guru

    When you're in a foreign city, you sometimes look around and ask: Where are all the people? Goby has the answer. This app pinpoints the neighborhood hot spots (including museums, hotels, eateries, and more) in your neighborhood. But its true value comes in finding nearby events. You'll discover concerts, plays, and more right around the corner.

    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.

    Have you ever thought of taking a train and having an adventure(奇遇)?Riding the train can be a real adventure. That is how I feel every time I take Amtrak. I often take a four－hour trip to visit my children. Every time I take this trip I never know what will happen.

    Last week when I was on the train and over an hour into the train ride, there was a man sitting by himself in the back of the train carrying on a mobile phone conversation－in another language. It was loud and disturbed most of the people on the train. I think it was annoying.

    Fortunately I sat next to a wonderful old lady who was taking a two－day trip by train. She said her two daughters were distraught at the thought of her driving for three days to reach her home, although she had no trouble driving. The train ride was the only choice for her. She loved to look out of the window and watch the world go by on the train.

    She was fun to talk to and asked me when my children started being parents. That is a very good question. Both of us are old and have children. She asked that same question from time to time.

    There are always many people on the train from all walks of life, different countries, and many languages. Riding the train is a great way to increase your knowledge and take in all kinds of cultures. If you get hungry, you can buy food in the food car at any time. If you need to use the restroom there is always one available.

It sure beats driving the car, which has to stop for food and restrooms. And it is better than taking the bus.