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Another aha! moment came from a 2010 Wayne State University research project that looked into pre-1950s baseball cards of Major League players.
另一项令人顿悟的研究是由2010年韦恩州立大学进行的，这个项目研究了二十世纪五十年代前美国职业棒球联盟球员卡。
The researchers found that the span of a player's smile could actually predict the span of his life.
这些研究者发现一个球员笑脸的绽放程度能够预测其寿命的长短。
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.
没有在照片上露出微笑的球员平均寿命只有72.9岁，而那些微笑的球员平均寿命将近80岁。
The good news is that we're actually born smiling.
好消息是我们天生就会微笑。
Using 3D ultrasound technology, we can now see that developing babies appear to smile, even in the womb.
通过三维超声波技术我们可以看到，即使在子宫中，正在成形的胎儿似乎也是面带微笑的。
When they're born, babies continue to smile -- initially, mostly in their sleep.
出生之后，他们还是带着微笑－－他们大多在睡梦中微笑。
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.
失明的婴儿听到人声时也会微笑。微笑是全人类生理上最统一、最基本的表情。
In studies conducted in Papua New Guinea, Paul Ekman, the world's most renowned researcher on facial expressions,
在巴布亚新几内亚进行的一些研究中，世界上最知名的面部表情研究者保罗·艾克曼，
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.
发现原始部落Fore的成员，虽然与西方文化相隔绝并以其食人肉的宗教习性著称，但他们也像我们一样在不同场合下会露出微笑。
So from Papua New Guinea to Hollywood all the way to modern art in Beijing, we smile often, and use smiles to express joy and satisfaction.
从巴布亚新几内亚到好莱坞，再到北京的现代艺术我们经常微笑，以微笑来表达喜悦美满之情。
