The science of love
<p><span word="Scientists">Scientists</span> <span word="are">are</span> <span word="finding">finding</span> <span word="that">that</span>, <span word="after">after</span> <span word="all">all</span>, <span word="love">love</span> <span word="really">really</span> <span word="is">is</span> <span word="down">down</span> <span word="to">to</span> <span word="a">a</span> <span word="chemical">chemical</span> <span word="addiction">addiction</span> <span word="between">between</span> <span word="people">people</span>.</p><p><span word="OVER">OVER</span> <span word="the">the</span> <span word="course">course</span> <span word="of">of</span> <span word="history">history</span> <span word="it">it</span> <span word="has">has</span> <span word="been">been</span> <span word="artists">artists</span>, <span word="poets">poets</span> <span word="andplaywrights">andplaywrights</span>（剧作家）<span word="who">who</span> <span word="have">have</span> <span word="made">made</span> <span word="the">the</span> <span word="greatest">greatest</span> <span word="progress">progress</span> <span word="in">in</span> <span word="humanity">humanity</span>'<span word="s">s</span> <span word="understanding">understanding</span> <span word="of">of</span> <span word="love">love</span>. <span word="Romance">Romance</span> <span word="has">has</span> <span word="seemed">seemed</span> <span word="asinexplicable">asinexplicable</span>（费解的）<span word="as">as</span> <span word="the">the</span> <span word="beauty">beauty</span> <span word="of">of</span> <span word="a">a</span> <span word="rainbow">rainbow</span>. <span word="But">But</span> <span word="these">these</span> <span word="days">days</span> <span word="scientists">scientists</span> <span word="are">are</span> <span word="challenging">challenging</span> <span word="that">that</span> <span word="notion">notion</span>, <span word="and">and</span> <span word="they">they</span> <span word="have">have</span> <span word="rather">rather</span> <span word="a">a</span> <span word="lot">lot</span> <span word="to">to</span> <span word="say">say</span> <span word="about">about</span> <span word="how">how</span> <span word="and">and</span> <span word="why">why</span> <span word="people">people</span> <span word="love">love</span> <span word="each">each</span> <span word="other">other</span>.</p><p><span word="Is">Is</span> <span word="this">this</span> <span word="useful">useful</span>? <span word="The">The</span> <span word="scientists">scientists</span> <span word="think">think</span> <span word="so">so</span>. <span word="For">For</span> <span word="a">a</span> <span word="start">start</span>, <span word="understanding">understanding</span> <span word="the">the</span> <span word="neurochemical">neurochemical</span> <span word="pathways">pathways</span> <span word="that">that</span> <span word="regulate">regulate</span> <span word="social">social</span> <span word="attachments">attachments</span> <span word="may">may</span> <span word="help">help</span> <span word="to">to</span> <span word="deal">deal</span> <span word="with">with</span> <span word="defects">defects</span> <span word="in">in</span> <span word="people">people</span>'<span word="s">s</span> <span word="ability">ability</span> <span word="to">to</span> <span word="form">form</span> <span word="relationships">relationships</span>. <span word="All">All</span> <span word="relationships">relationships</span>, <span word="whether">whether</span> <span word="they">they</span> <span word="are">are</span> <span word="those">those</span> <span word="of">of</span> <span word="parents">parents</span> <span word="with">with</span> <span word="their">their</span> <span word="children">children</span>, <span word="spouses">spouses</span> <span word="with">with</span> <span word="their">their</span> <span word="partners">partners</span>, <span word="or">or</span> <span word="workers">workers</span> <span word="with">with</span> <span word="their">their</span> <span word="colleagues">colleagues</span>, <span word="rely">rely</span> <span word="on">on</span> <span word="an">an</span> <span word="ability">ability</span> <span word="to">to</span> <span word="create">create</span> <span word="and">and</span> <span word="maintain">maintain</span> <span word="social">social</span> <span word="ties">ties</span>. <span word="Defects">Defects</span> <span word="can">can</span> <span word="be">be</span> <span word="disabling">disabling</span>, <span word="and">and</span> <span word="become">become</span> <span word="apparent">apparent</span> <span word="as">as</span> <span word="disorders">disorders</span> <span word="such">such</span> <span word="as">as</span> <span word="autism">autism</span> <span word="andschizophrenia">andschizophrenia</span>（精神分裂症）&<span word="mdash">mdash</span>;<span word="and">and</span>, <span word="indeed">indeed</span>, <span word="as">as</span> <span word="the">the</span> <span word="serious">serious</span> <span word="depression">depression</span> <span word="that">that</span> <span word="can">can</span> <span word="result">result</span> <span word="from">from</span> <span word="rejection">rejection</span> <span word="in">in</span> <span word="love">love</span>. <span word="Research">Research</span> <span word="is">is</span> <span word="also">also</span> <span word="shedding">shedding</span> <span word="light">light</span> <span word="on">on</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="more">more</span> <span word="extreme">extreme</span> <span word="forms">forms</span> <span word="of">of</span> <span word="sexual">sexual</span> <span word="behaviour">behaviour</span>. <span word="And">And</span>, <span word="controversially">controversially</span>, <span word="someutopian">someutopian</span>（乌托邦的）<span word="fringe">fringe</span> <span word="groups">groups</span> <span word="see">see</span> <span word="such">such</span> <span word="work">work</span> <span word="as">as</span> <span word="the">the</span> <span word="doorway">doorway</span> <span word="to">to</span> <span word="a">a</span> <span word="future">future</span> <span word="where">where</span> <span word="love">love</span> <span word="is">is</span> <span word="guaranteed">guaranteed</span> <span word="because">because</span> <span word="it">it</span> <span word="will">will</span> <span word="be">be</span> <span word="provided">provided</span> <span word="chemically">chemically</span>, <span word="or">or</span> <span word="even">even</span> <span word="genetically">genetically</span> <span word="engineered">engineered</span> <span word="from">from</span> <span word="conception">conception</span>.</p><p><span word="The">The</span> <span word="scientific">scientific</span> <span word="tale">tale</span> <span word="of">of</span> <span word="love">love</span> <span word="begins">begins</span> <span word="innocently">innocently</span> <span word="enough">enough</span>, <span word="with">with</span> <span word="voles">voles</span>. <span word="The">The</span> <span word="prairievole">prairievole</span>（野鼠）<span word="is">is</span> <span word="a">a</span> <span word="sociable">sociable</span> <span word="creature">creature</span>, <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="only">only</span> 3% <span word="of">of</span> <span word="mammal">mammal</span> <span word="species">species</span> <span word="that">that</span> <span word="appear">appear</span> <span word="to">to</span> <span word="formmonogamous">formmonogamous</span>（一夫一妻的）<span word="relationships">relationships</span>. <span word="Mating">Mating</span> <span word="between">between</span> <span word="prairie">prairie</span> <span word="voles">voles</span> <span word="is">is</span> <span word="a">a</span> <span word="tremendous">tremendous</span> 24-<span word="hour">hour</span> <span word="effort">effort</span>. <span word="After">After</span> <span word="this">this</span>, <span word="they">they</span> <span word="bond">bond</span> <span word="for">for</span> <span word="life">life</span>. <span word="They">They</span> <span word="prefer">prefer</span> <span word="to">to</span> <span word="spend">spend</span> <span word="time">time</span> <span word="with">with</span> <span word="each">each</span> <span word="other">other</span>, <span word="groom">groom</span> <span word="each">each</span> <span word="other">other</span> <span word="for">for</span> <span word="hours">hours</span> <span word="on">on</span> <span word="end">end</span> <span word="and">and</span> <span word="nest">nest</span> <span word="together">together</span>. <span word="They">They</span> <span word="avoid">avoid</span> <span word="meeting">meeting</span> <span word="other">other</span> <span word="potential">potential</span> <span word="mates">mates</span>. <span word="The">The</span> <span word="male">male</span> <span word="becomes">becomes</span> <span word="an">an</span> <span word="aggressive">aggressive</span> <span word="guard">guard</span> <span word="of">of</span> <span word="the">the</span> <span word="female">female</span>. <span word="And">And</span> <span word="when">when</span> <span word="their">their</span> <span word="pups">pups</span> <span word="are">are</span> <span word="born">born</span>, <span word="they">they</span> <span word="becomeaffectionate">becomeaffectionate</span>（深情的）<span word="and">and</span> <span word="attentive">attentive</span> <span word="parents">parents</span>. <span word="However">However</span>, <span word="another">another</span> <span word="vole">vole</span>, <span word="a">a</span> <span word="close">close</span> <span word="relative">relative</span> <span word="called">called</span> <span word="the">the</span> <span word="montane">montane</span> <span word="vole">vole</span>, <span word="has">has</span> <span word="no">no</span> <span word="interest">interest</span> <span word="in">in</span> <span word="partnership">partnership</span> <span word="beyond">beyond</span> <span word="one">one</span>-<span word="night">night</span>-<span word="stand">stand</span> <span word="sex">sex</span>. <span word="What">What</span> <span word="is">is</span> <span word="intriguing">intriguing</span> <span word="is">is</span> <span word="that">that</span> <span word="these">these</span> <span word="vast">vast</span> <span word="differences">differences</span> <span word="in">in</span> <span word="behaviour">behaviour</span> <span word="are">are</span> <span word="the">the</span> <span word="result">result</span> <span word="of">of</span> <span word="a">a</span> <span word="mere">mere</span> <span word="handful">handful</span> <span word="of">of</span> <span word="genes">genes</span>. <span word="The">The</span> <span word="two">two</span> <span word="vole">vole</span> <span word="species">species</span> <span word="are">are</span> <span word="more">more</span> <span word="than">than</span> 99% <span word="alike">alike</span>, <span word="genetically">genetically</span>.</p>
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