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How many people here in this room smile more than 20 times per day?
在座的各位有多少人每天微笑超过20次？
Raise your hand if you do. Oh, wow.
超过的请举手。
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.
哇，在全世界每天有超过三分之一的人每天微笑超过20次，而每天微笑不足五次的人占人口的14%。
In fact, those with the most amazing superpowers are actually children, who smile as many as 400 times per day.
实际上，拥有最多超能力的要数儿童，他们每天微笑约为400次。
Have you ever wondered why being around children, who smile so frequently, makes you smile very often?
你有没有想过为什么与经常微笑的孩子们相处久了，你也变得爱笑了？
A recent study at Uppsala University in Sweden found that it's very difficult to frown when looking at someone who smiles.
瑞典乌普萨拉大学近期的一项研究发现当人在微笑时，很难同时皱起眉头。
You ask why? Because smiling is evolutionarily contagious, and it suppresses the control we usually have on our facial muscles.
你可能会问为什么？这是因为微笑的感染力极强，它主导了我们对面部肌肉的控制。
Mimicking a smile and experiencing it physically helps us understand whether our smile is fake or real, so we can understand the emotional state of the smiler.
对微笑进行模拟和物理测试能够让我们分辨微笑是真是假，进而了解微笑者的情绪。
