What brings a nation together? Of the four choices — shared values, language, history, and religion, it's shared values. In our latest poll (民意调査), seven out of 16 countries chose values as the greatest factor (因素）bringing a nation together, and six preferred language. Both choices scored high in the poll, suggesting that our values and how we express them are closely linked Still, history was not forgotten in some countries, particularly in Mexico and Russia. Even Canada and the United States chose national histories as the second-most important factor uniting their people. The biggest surprise? Not one country picked religion as its top choice.

    Prinker: Color Your Way

    Tattoos always look so cool, but actually getting one is quite a commitment. After all, apart from using expensive laser removal therapy, they stay on your skin forever.

    The Prinker is here to change the game. It is a device (设备) that lets you create or print any image or temporary tattoos within a matter of seconds. It is connected to your smartphone and you can select a bunch of preloaded tattoos available in the app.

    This device was exhibited at The International Consumer Electronics Show in Las Vegas this year. It is manufactured by a Korean startup company called “SketchOn”.

    You can sketch your ideas out on your skin with this portable device that is almost twice the size of a computer mouse. This is a nice way to support your team in the match by printing its logo or design onto your skin. You can also share your tattoo designs with others through the app. It is also a fun and creative toy for kids to play with.

    In order to print the design, all you need to do is select or draw a design on your mobile and then press and rub the base of the device against your skin and you are done. These designs and images are water resistant but can be washed off with soap water. The ink of the Prinker is non-toxic and is made only from certified cosmetic ingredients. Each cartridge (墨盒) contains enough ink for about 1,500 tattoos, or as J₊ R. Smith would call it, “a good start.”

    The Prinker is developed by a small team of five members. The company is planning to launch the device in China and then in the United States. The device is currently commercializing in Korea as a rental device. The agencies and organizations pay $150 for a day to use it in their events or marketing.

    The current version of Prinker is aimed towards business users (think festivals, carnivals, sports events, promotion campaigns). But the company is working on a home version, and hopes to have it available to buy before the end of 2018. SketchOn estimates the personal model will retail at $200. The company is currently seeking to partner with international agencies for distribution opportunities.

    Although Prinker is currently aimed towards novelty and creative purposes, its technologies could eventually be adapted for use by professional tattoo artists or medical professionals who provide tattoos for patients, such as after a breast cancer operation or skin graft.

    Before a new type of airplane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.

    The first is called the "tank test". A modem airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构)of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. Vne pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.

    The most dangerous test happens when the new plane is going through test flights in the air. The test pilot must find out exactly what happens when the engines (发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot's job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.

    Reading may be fundamental, but how the brain gives meaning to letters on a page has been a mystery. Two new studies fill in some details on how the brains of efficient readers handle words. One of the studies, published in the April 30 Neuron, suggests that a visual-processing area of the brain recognizes common words as whole units. Another study, published online April 27 in PLOSONE, makes it known that the brain operates two fast parallel systems for reading, linking visual recognition of words to speech.

    Maximilian Riesenhuber, a neuroscientist at Georgetown University in Washington, D. C. , wanted to know whether the brain reads words letter by letter or recognizes words as whole objects. He and his colleagues showed sets of real words or nonsense(无意义的词语)words to volunteers undergoing FMRI scans. The words differed in only one letter, such as “farm” and “form” or “soat” and “poat”, or were completely different, such as “farm” and “coat”or “poat” and “hime”.The researchers were particularly interested in what happens in the visual word form area, or VWFA, an area on the left side of the brain just behind the ear that is involved in recognizing words.

    Riesenhuber and his colleagues found that neurons(神经元)in the VWFA respond strongly to changes in real words. Changing “farm” to “form”, for example, produced as great a change in activity as changing “farm” to“coat”, the team reports in Neuron. The area responded slowly to single-letter changes in made-up words.

    The data suggests that readers grasp real words as whole objects, rather than focusing on letters or letter combinations. And as a reader's exposure to a word increases, the brain comes to recognize the shape of the word. “Meaning is passed on after recognition in the brain”, Riesenhuber says.

    The researchers don't yet know how longer and less familiar words are recognized, or if the brain can be trained to recognize nonsense words as a unit.

    My house is made of wood, glass and stone. It is also made of software.

    If you come to visit, you'll probably be surprised when you come in. Someone will give you an electronic PIN (个人身份证号码) to wear. This PIN tells the house who and where you are. The house uses this information to give you what you need. When it's dark outside, the PIN turns on the lights nearest you, and then turns them off as you walk away from them. Music moves with you too. If the house knows your favorite music, it plays it. The music seems to be everywhere, but in fact other people in the house hear different music or no music. If you get a telephone call, only the nearest telephone rings.

    Of course, you are also able to tell the house if you want something. There is a home control console (控制台), a small machine that turns things on and off around you.

    The PIN and the console are new ideas, but they are in fact like many things we have today. If you want to go to a movie, you need a ticket. If I give you my car keys, you can use my car. The car works for you because you have the keys. My house works for you because you wear the PIN or hold the console.

    I believe that ten years from now on, most new homes will have the systems that I've put in my house. The systems will probably be even bigger and better than the ones I've put in today.

    I like to try new ideas. I know that some of my ideas will work better than others. But I hope that one day I will stop thinking of these systems as new, and ask myself instead, "How did I live without them?"