一张图看你看遍：百年人类笑容进化史
<p><span word="There">There</span>'<span word="s">s</span> <span word="a">a</span> <span word="reason">reason</span> <span word="why">why</span> <span word="people">people</span> 100 <span word="years">years</span> <span word="ago">ago</span> <span word="looked">looked</span> <span word="miserable">miserable</span>. <span word="A">A</span> <span word="new">new</span> <span word="study">study</span> <span word="has">has</span> <span word="revealed">revealed</span> <span word="how">how</span> <span word="our">our</span> <span word="smiles">smiles</span> <span word="have">have</span> <span word="evolved">evolved</span> <span word="in">in</span> <span word="photographs">photographs</span> <span word="as">as</span> <span word="a">a</span> <span word="direct">direct</span> <span word="result">result</span> <span word="of">of</span> <span word="improving">improving</span> <span word="technology">technology</span>.<span word="The">The</span> <span word="research">research</span> <span word="was">was</span> <span word="done">done</span> <span word="using">using</span> <span word="a">a</span> <span word="new">new</span> <span word="data">data</span>-<span word="mining">mining</span> <span word="tool">tool</span>, <span word="which">which</span> <span word="can">can</span> <span word="reveal">reveal</span> <span word="patterns">patterns</span> <span word="in">in</span> <span word="anything">anything</span> <span word="from">from</span> <span word="phone">phone</span> <span word="conversations">conversations</span> <span word="to">to</span> <span word="behaviour">behaviour</span> <span word="on">on</span> <span word="social">social</span> <span word="media">media</span>.</p><p>100年前的人看着那么悲催是有原因的。随着技术的不断改进，一项新研究向人们揭示了照片中的"笑容进化史"。通过应用新的数据处理工具，这项研究得以揭示从电话谈话到社交媒体中的一切规律。</p><p><span word="Ginosar">Ginosar</span> <span word="looked">looked</span> <span word="at">at</span> 150,000 <span word="yearbook">yearbook</span> <span word="photos">photos</span> <span word="as">as</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="study">study</span>.<span word="After">After</span> <span word="deleting">deleting</span> <span word="photos">photos</span> <span word="that">that</span> <span word="weren">weren</span>'<span word="t">t</span> <span word="face">face</span>-<span word="on">on</span>, <span word="she">she</span> <span word="was">was</span> <span word="left">left</span> <span word="with">with</span> <span word="around">around</span> 37,000 <span word="images">images</span> <span word="from">from</span> 800 <span word="yearbooks">yearbooks</span> <span word="in">in</span> 26 <span word="states">states</span>.</p><p>吉诺萨研究了15万张年鉴里的照片。去掉非正脸照片后，她留下了从26个州800本年鉴中找到的3万7千多张照片。</p><p><span word="She">She</span> <span word="then">then</span> <span word="put">put</span> <span word="the">the</span> <span word="photographs">photographs</span> <span word="together">together</span> <span word="based">based</span> <span word="on">on</span> <span word="gender">gender</span>, <span word="and">and</span> <span word="then">then</span> <span word="decade">decade</span>, <span word="before">before</span> <span word="they">they</span> <span word="were">were</span> <span word="blended">blended</span> <span word="into">into</span> <span word="on">on</span> <span word="another">another</span> <span word="to">to</span> <span word="create">create</span> <span word="an">an</span> '<span word="average">average</span>' <span word="face">face</span> <span word="from">from</span> <span word="each">each</span> <span word="period">period</span>.<span word="After">After</span> <span word="analysing">analysing</span> <span word="the">the</span> <span word="images">images</span> <span word="using">using</span> <span word="her">her</span> <span word="data">data</span> <span word="mining">mining</span> <span word="tool">tool</span>, <span word="she">she</span> <span word="found">found</span> <span word="the">the</span> <span word="most">most</span> <span word="obvious">obvious</span> <span word="difference">difference</span> <span word="between">between</span> <span word="was">was</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="the">the</span> <span word="smile">smile</span>, <span word="which">which</span> <span word="gets">gets</span> <span word="broader">broader</span> <span word="as">as</span> <span word="the">the</span> <span word="years">years</span> <span word="go">go</span> <span word="on">on</span>.</p><p>她先把照片根据性别和年份拼在一起，然后将这些照片重新排列，并从每个时期找出一张"大众"脸。通过运用数据处理工具解析图片，她发现其中最明显的区别莫过于微笑的演变，随着年代不断靠近，人们的微笑也越来越开怀。</p>
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