I started my journey in California with a UC Berkley 30-year longitudinal study that examined the photos of students in an old yearbook and tried to measure their success and well-being throughout their life. By measuring their student smiles, researchers were able to predict how fulfilling and long-lasting a subject's marriage will be, how well she would score on standardized tests of well-being and how inspiring she would be to others. In another yearbook, I stumbled upon Barry Obama's picture. When I first saw his picture, I thought that these superpowers came from his super collar. But now I know it was all in his smile.我的旅程开始于加州，以柏克莱大学从事30年期的纵贯研究，研究一本旧年鉴中的学生照片，试着衡量他们一生的成就和幸福。藉由衡量学生的微笑，研究人员能够预测研究对象的婚姻是否圆满及长久，他在标准化幸福评量中能得到多少分，以及他能为别人带来多少启发。在另一本年鉴中，我偶然发现了欧巴马的照片，当我第一次看到他的照片时，我认为这些超能力来自于他的超大衣领，但现在我知道这全来自于他的笑容。

Another aha! moment came from a 2010 Wayne State University research project that looked into pre-1950s baseball cards of Major League players. The researchers found that the span of a players smile could actually predict the span of his life. Players who didn't smile in their pictures lived an average of only 72.9 years, where players with beaming smiles lived an average of almost 80 years.

另一个啊哈！时刻，来自2010年Wayne州立大学的研究项目，观察50年代前职棒大联盟球员的棒球卡，研究人员发现，球员微笑的宽度事实上可以预测他寿命的长度，相片中没有笑容的球员，平均寿命仅72.9岁，拥有灿烂笑容的球员，平均寿命将近80岁。

(Laughter)（笑声）

The good news is that we're actually born smiling. Using 3D ultrasound technology, we can now see that developing babies appear to smile, even in the womb. When they're born, babies continue to smile -- initially, mostly in their sleep. And even blind babies smile to the sound of the human voice. Smiling is one of the most basic, biologically-uniform expressions of all humans.

In studies conducted in Papua New Guinea, Paul Ekman, the world's most renowned researcher on facial expressions, found that even members of the Fore tribe, who were completely disconnected from Western culture, and also known for their unusual cannibalism rituals, attributed smiles to descriptions of situations the same way you and I would. So from Papau New Guinea to Hollywood all the way to modern art in Beijing, we smile often, and you smile to express joy and satisfaction.

在巴布亚新几内亚进行的研究中，Paul Ekman，世界上最知名的脸部表情研究者发现，即使是Fore部落中的成员，他们完全与西方文化隔绝，也因他们不寻常的吃人仪式而众所皆知，他们就像你我一样，也会在某些情况下微笑。因此，从巴布亚新几内亚到好莱坞，一直到北京的现代艺术，我们经常微笑着。你用微笑来表达喜悦和满足。

How many people here in this room smile more than 20 times per day? Raise your hand if you do. Oh, wow. Outside of this room, more than a third of us smile more than 20 times per day, whereas less than 14 percent of us smile less than five. In fact, those with the most amazing superpowers are actually children who smile as many as 400 times per day.

在这房间里，有多少人每天微笑超过20次？如果有的话请举起手。哦，哇！在这个房间外，超过三分之一的人每天微笑超过20次，不到14%的人每天微笑少于5次。事实上，拥有最惊人超能力的是孩童，他们每天微笑多达400次。

Have you ever wondered why being around children who smile so frequently makes you smile very often? A recent study at Uppsala University in Sweden found that it's very difficult to frown when looking at someone who smiles. You ask, why? Because smiling is evolutionarily contagious, and it suppresses the control we usually have on our facial muscles. Mimicking a smile and experiencing it physically help us understand whether our smile is fake or real, so we can understand the emotional state of the smiler. 

你有没有想过，为什么身处在经常微笑的孩子身边，也会让你经常微笑？最近在瑞典Uppsala大学的一项研究发现，当看着正在微笑的人时是很难皱眉的。你会问为什么？因为微笑具有演化上的感染性，它能抑制我们平时对脸部肌肉的控制，模仿一个微笑并实际体验它，帮助我们了解我们的微笑是假是真，因此我们可以了解微笑者的情绪状态。

In a recent mimicking study at the University of Clermont-Ferrand in France, subjects were asked to determine whether a smile was real or fake while holding a pencil in their mouth to repress smiling muscles. Without the pencil, subjects were excellent judges, But with the pencil in their mouth, when they could not mimic the smile they saw, their judgment was impaired.

最近在法国Clermont-Ferrand大学的一次模仿研究中，要求测试对象在口中含住一支铅笔抑制微笑肌肉时，判断一个微笑是真是假。不含住铅笔时测试对象有优秀的判断力，但当他们口中含着铅笔时，就无法模仿他们看到的笑容，他们的判断力就会受损。

(Laughter)（笑声）

In addition to theorizing on evolution in "The Origin of Species", Charles Darwin also wrote the facial feedback response theory. His theory states that the act of smiling itself actually makes us feel better -- rather than smiling being merely a result of feeling good. In his study, Darwin actually cited a French neurologist, Guillaume Duchenne, who used electric jolts to facial muscles to induce and stimulate smiles. Please, don't try this at home.

除了在《物种起源》中阐述进化论以外，达尔文还写了脸部回馈理论。他的理论阐述，微笑这个行为本身，事实上能让我们感觉更好，而不仅是感觉不错的一个结果。在他的研究中，达尔文事实上引用了法国神经学家Guillaume Duchenne的实验，他使用电刺激脸部肌肉，诱发及激起微笑产生。请不要在家里尝试这个。

(Laughter)（笑声）

In a related German study, researchers used fMRI imaging to measure brain activity before and after injecting Botox to suppress smiling muscles. The finding supported Darwin's theory by showing that facial feedback modifies the neural processing of emotional content in the brain in a way that helps us feel better when we smile. Smiling stimulates our brain reward mechanism in a way that even chocolate -- a well-regarded pleasure inducer -- cannot match.

在德国一项相关研究中，研究人员使用功能性核磁共振造影（fMRI），拍摄在注射肉毒杆菌抑制微笑肌肉前后，对大脑活动进行测量的照片，这个发现支持达尔文的理论，显示当我们微笑时，脸部回馈会改变大脑中情绪部份的神经处理程序，在某种程度上帮助我们感觉更好。微笑刺激我们的大脑奖励机制，在某种程度上，甚至连巧克力，一个公认的快乐诱导物，都无法比拟。

British researchers found that one smile can generate the same level of brain stimulation as up to 2,000 bars of chocolate. (Laughter) Wait. The same study found that smiling is as stimulating as receiving up to 16,000 pounds Sterling in cash. That's like 25 grand a smile. It's not bad. And think about it this way: 25,000 times 400 -- quite a few kids out there feel like mark Zuckerberg every day.

英国研究人员发现，一个微笑可以使大脑产生与2000根巧克力棒相同程度的刺激。（笑声）等等，同样的研究发现，微笑造成的刺激跟得到16000英镑现金相同，一个微笑就像25000美金，还不错。再想想看，25000乘以400，世上不少孩子每天都有像Mark Zuckerberg的感觉（facebook创办人）。

And, unlike lots of chocolate, lots of smiling can actually make you healthier. Smiling can help reduce the level of stress-enhancing hormones like cortisol, adrenaline and dopamine, increase the level of mood-enhancing hormones like endorphin and reduce overall blood pressure.

而且，不像一大堆巧克力，大量微笑事实上可以让你更健康。微笑可以帮助降低提升压力荷尔蒙的含量，如皮质醇、肾上腺素和多巴胺，增加提升情绪荷尔蒙的含量，如脑内啡，并降低整体血压。

And if that's not enough, smiling can actually look good in the eyes of others. A recent study at Penn State University found that when you smile you don't only appear to be more likable and courteous, but you actually appear to be more competent.

如果这还不够，微笑事实上可以使你在他人眼中看起来更好。最近一项在宾州州立大学的研究发现，当你微笑时，你不仅显得更可爱、更有礼貌，事实上你会显得更能干。

So whenever you want to look great and competent, reduce your stress or improve your marriage, or feel as if you just had a whole stack of high-quality chocolate -- without incurring the caloric cost -- or as if you found 25 grand in a pocket of an old jacket you hadn't worn for ages, or whenever you want to tap into a superpower that will help you and everyone around you live a longer, healthier, happier life, smile.

所以，当你想看起来很棒、很能干、减少你的压力，或改善你的婚姻，或想要感觉像是吃了一堆高质量巧克力，而不需承受热量的代价，或彷佛在一件多年没穿的旧夹克口袋中发现二万五千元，或当你想使用超能力帮助自己和周围每个人活得更长久、更健康、生活得更幸福，微笑吧！

(Applause)（掌声）