We all know the hard work that filmmakers and actors put in to provide us with entertainment, but it seems that even regular moviegoers like us have a big impact on how a movie turns out too.

    For decades now, film studios have used so-called test screenings（试映）to get feedback from members of the public before a movie comes out.

    While test audience members are usually asked to fill in a questionnaire after a screening, telling the film studio what they liked and didn't like, media giant Disney has come up with a more high-tech solution.

    According to a paper published this summer by the company's researchers, Disney is measuring test audiences' reactions(反应) by using special cameras placed inside cinemas.

    Pairing the cameras with custom(定制的) software, the company can track what each audience member is feeling at any point in the movie, from anger to joy.

    This works by mapping 68 different points on each audience member's face. The cameras can see in the dark, and the software can figure out a person's mood based on the slightest of facial expressions.

    It is hoped that this new method will allow more detailed feedback from test audiences. Rather than relying on audience members to recall their feelings after the movie's over, it can accurately read their reactions in real-time.

    Test screenings are highly valued in the movie industry, and several well- known movies have been greatly altered following feedback.

    Viewers of E.T. the Extra-Terrestrial(1982) would have left the cinema feeling a whole lot differently if it weren't for its test audience's feedback.

    "In one cut of the film that was tested, E.T. died instead of going home in his spaceship. You won't be surprised to hear that the test audience in question didn't warm to this ending at all," wrote media website Den of Geek.

    But for those of us who are concerned about privacy, the cameras won't be installed in public cinemas.

    After all, unless you're part of a test audience, being in front of the camera is best left to the movie stars.

    1990 was an important year in world events. In February, Nelson Mandela was set free after 27 years in prison. In October, East and West Germany became one country again. Then at the end of 1990, the World Wide Web was born. For this final event we have one man to thank. Tim Berners-Lee, the father of the Web.

    Berners-Lee was born on June 8, 1955 in London, England. His parents, both computer designers, encouraged him to think and work creatively as he grew up. He was an excellent student and naturally took an interest in computers and science.

    After graduating from Oxford University, Tim went to work at a science research centre in Switzerland. There he developed some of the different systems（系统）that would later become the Web. The first was HTML, the computer language used to make web pages. The second was an address system that let computers anywhere find each other and send and receive information. In 1990 he put them together to make the first Internet browser（浏览器）.

    Tim knew that the more people used the Web, the more useful it would be. He wasn't interested in money but knowledge, so he gave out his invention for free to anyone who was interested. Many were interested an the growth of the Internet began.

    Today Tim works as a professor at the MIT in America, studying new ways to use the Web. He has received many awards from governments and organizations for his efforts. He is still not very interested in money. That is why he is so liked by his students and workmates. It may also be one of the reasons that few people outside the world of technology know his name.

    At times my mom has been uncomfortable seeing these qualities in me. For example, when I was 12, I went to Puerto Rico all by myself to stay with my grandmother for the summer. My mom was extremely nervous about it. She kept telling me how things were different in Puerto Rico, to always put on sunscreen, not to wander away from my grandmother, and other warnings. She helped me pack and did not leave the airport until she saw my plane take off.

    Despite her worries, she let me go on my own. As I moved into my teens, she continued to give me space to grow and learn, even when it might have been difficult for her. When I reached my senior year, I decided to move away for college. Once again I found that I differed from my peers: while many of them wanted to stay close to home, I couldn't wait to be out in the world on my own. While my mom may not have been happy at the thought of my going away, she was supportive and excited for me.

    One big thing I realized during my senior year when my mom granted me more freedom was that she actually believed in me and trusted me. That meant a lot. In most time of my life, and especially when I was little, the main person I tried to impress in my schoolwork or other things was my mother. I knew she expected nothing but the best of me. Sometimes it was hard to live up to her standards; getting a single B on my report card would make me feel bad because I knew she wanted me to have all A's.

    I know that her high standards have helped me stay focused on what's important, like education, and made me who I am. I am thankful for her support and involvement in my life. Most of all I respect her. She is the strongest woman I know and that's why I have turned out so strong and independent.

    A new keyboard can tell whether you are its owner. The keyboard records information about the typing pattern and sends it to a computer program. The program then checks to see if the pattern matches the right user. If not, an alarm sounds, and the computer locks the typist out. It locks out anyone else, even if the person knows password. What's more, this device needs no batteries. It harvests all the energy it needs from the action of your typing. Besides, the keyboard is also self-cleaning and the keys are free of damage from water, oil and dirt.

    The keys of the new keyboard are made of the same inexpensive plastic that might be found on any other standard keyboard. But instead of being smooth, the keys have millions of tiny plastic nanowires (纳米线) on their surface area to every key, increasing the effective contact area between the plastics and fingers. This ensures that there's enough power to run the keyboard as someone types.

    Liming Dai, a scientist, did not work on the new keyboard, but he thinks the design could be important in getting better performance from a variety of devices. “It could also be applied to a touch screen, for instance,” Dai says. “Then smart phones and notepads could harvest energy from the action of someone typing or drawing.”

    “Future work might make the keyboard even more useful,” Dai adds. “A later design might build tiny capacitors(电容器) onto the nanowires,” he suggests. Capacitors are little devices that temporarily store electric charges. Those might then LEDs to light a Keyboard in the dark.

    Zhonglin Wang is a co-designer of the new keyboard. His team has build a working model of the keyboard. “If a company decides to fund(投资) its production, this keyboard could be in stores in as little as two years,” says Wang.

    Kathy Fletcher and David Simpson have a son named Santi. He had a friend who sometimes went to school hungry. So Santi invited him to occasionally eat and sleep at his house.

    That friend had a friend and that friend had a friend, and now when you go to dinner at Kathy and David's house on Thursday night there might be 15 to 20 teenagers gathering around the table, and later there will be groups of them crashing in the basement or in the few small bedrooms upstairs. The kids who show up at Kathy and David's have suffered the pains of modern poverty: homelessness, hunger, abuse.

    And yet by some miracle, hostile soil has produced beautiful flowers. Kids come from around the city. Spicy chicken and black rice are served. Cellphones are banned. The kids who call Kathy and David “Momma” and “Dad,” are polite and clear the dishes. Birthdays and graduations are celebrated. Songs are performed. Each meal we go around the table and everybody has to say something nobody else knows about them. Each meal the kids show their promise to care for one another.

    The adults in this community give the kids the chance to present their gifts. “At my first dinner, Edd read a poem that I first thought was from Langston Hughes, but it turned out to be his own. Kesari has a voice that somehow appeared from New Orleans jazz from the 1920s. Madeline and Thalya practice friendship as if it were the highest art form.”

    “They give us a gift — complete intolerance of social distance. When I first met Edd, I held out my hand to shake his. He looked at it and said, 'We hug here,' and we've been hugging since.”

    Bill Milliken, a veteran youth activist, is often asked which programs turn around kids' lives. “I still haven't seen one program change one kid's life,” he says. “What changes people is relationships. Somebody is willing to walk through the shadow of the valley of adolescence with them.” Souls are not saved in packs. Love is the necessary force.

    I was in the seventh grade, and we had moved to New Jersey in November. By then, everyone already had had their own friends, and no one wanted to talk to a new girl. To make things worse, they put me in "Section L". I found out later that everyone called Section L "Loserville". It was sort of an open secret that it was the section for troublemakers and not-so-smart kids. When I found out, I wanted to scream. I had always been a good student and had amazing friends, and now everyone thought I was a loser!

     I did text my friends in Illinois almost every night, especially my best friend, Ana. At first my friends wanted to hear all about it. But then some stopped texting back once I said something about how miserable I was. One night when I was texting with Ana, I complained about another friend who had just done that.

     Ana's texts came really fast for the next few minutes and they surprised me. She said that she was tired of hearing about how bad everything was in New Jersey, too. She said she did not want to hurt my feelings but that I needed to stop feeling so sorry for myself all the time, I had to try to make things better.

     The next day, I thought a lot about what Ana had said. She was right!

     I wish I could say that everything changed overnight after that, but it didn't. I was still stuck in "Loserville", and some people were still mean to me, even though I tried to just stay out of their way.

     But what did change was me—I stopped feeling so sorry for myself and did something about making friends. I signed up to make sets for the school play. I met a lot of new people there, and suddenly I had friends to say hi to in the halls!

     I still miss Illinois sometimes, but life in New Jersey isn't so hard anymore. Even though I couldn't change my situation, I could change my attitude—and that made all the difference.