研究：电子阅读器会随下载量的增加而加重？
<p><span word="You">You</span>'<span word="d">d</span> <span word="be">be</span> <span word="forgiven">forgiven</span> <span word="for">for</span> <span word="imagining">imagining</span> <span word="that">that</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="benefits">benefits</span> <span word="of">of</span> <span word="e">e</span>-<span word="books">books</span> <span word="is">is</span> <span word="that">that</span>, <span word="unlike">unlike</span> <span word="heavy">heavy</span> <span word="hardbacks">hardbacks</span>, <span word="a">a</span> <span word="digital">digital</span> <span word="best">best</span>-<span word="seller">seller</span> <span word="is">is</span> <span word="entirely">entirely</span> <span word="weightless">weightless</span>。</p><p><span word="However">However</span>, <span word="this">this</span> <span word="is">is</span> <span word="not">not</span> <span word="quite">quite</span> <span word="correct">correct</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="computer">computer</span> <span word="scientist">scientist</span> - <span word="a">a</span> <span word="Kindle">Kindle</span> <span word="full">full</span> <span word="of">of</span> <span word="downloads">downloads</span> <span word="weighs">weighs</span> <span word="more">more</span> <span word="than">than</span> <span word="an">an</span> <span word="empty">empty</span> <span word="one">one</span>。</p><p><span word="But">But</span> <span word="even">even</span> <span word="the">the</span> <span word="keenest">keenest</span> <span word="readers">readers</span> <span word="are">are</span> <span word="unlikely">unlikely</span> <span word="to">to</span> <span word="suffer">suffer</span> <span word="too">too</span> <span word="much">much</span> <span word="of">of</span> <span word="a">a</span> <span word="burden">burden</span>, <span word="as">as</span> <span word="a">a</span> <span word="full">full</span> <span word="library">library</span> <span word="of">of</span> <span word="e">e</span>-<span word="books">books</span> <span word="weighs">weighs</span> <span word="no">no</span> <span word="more">more</span> <span word="than">than</span> <span word="a">a</span> <span word="single">single</span> <span word="molecule">molecule</span> <span word="of">of</span> <span word="DNA">DNA</span>。</p><p><span word="According">According</span> <span word="to">to</span> <span word="John">John</span> <span word="Kubiatowicz">Kubiatowicz</span>, <span word="from">from</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="California">California</span>, <span word="Berkeley">Berkeley</span>, <span word="the">the</span> <span word="difference">difference</span> <span word="between">between</span> <span word="an">an</span> <span word="empty">empty</span> <span word="e">e</span>-<span word="reader">reader</span> <span word="and">and</span> <span word="a">a</span> <span word="full">full</span> <span word="one">one</span> <span word="is">is</span> <span word="just">just</span> <span word="one">one</span> <span word="attogram">attogram</span>, <span word="or">or</span> 10-18 <span word="of">of</span> <span word="a">a</span> <span word="gram">gram</span>。</p><p><span word="This">This</span> <span word="weight">weight</span> <span word="is">is</span> <span word="so">so</span> <span word="tiny">tiny</span> <span word="as">as</span> <span word="to">to</span> <span word="be">be</span> "<span word="effectively">effectively</span> <span word="unmeasurable">unmeasurable</span>" <span word="by">by</span> <span word="any">any</span> <span word="scales">scales</span> <span word="that">that</span> <span word="currently">currently</span> <span word="exist">exist</span>, <span word="he">he</span> <span word="says">says</span>。</p><p><span word="The">The</span> <span word="difference">difference</span> <span word="in">in</span> <span word="weight">weight</span> <span word="is">is</span> <span word="far">far</span> <span word="less">less</span> <span word="than">than</span> <span word="the">the</span> <span word="difference">difference</span> <span word="produced">produced</span> <span word="by">by</span> <span word="charging">charging</span> <span word="the">the</span> <span word="battery">battery</span>, <span word="or">or</span> <span word="wiping">wiping</span> <span word="dust">dust</span> <span word="off">off</span> <span word="the">the</span> <span word="screen">screen</span>。</p><p><span word="And">And</span> <span word="electronic">electronic</span> <span word="devices">devices</span> <span word="tend">tend</span> <span word="to">to</span> <span word="grow">grow</span> <span word="heavier">heavier</span> <span word="in">in</span> <span word="sunlight">sunlight</span> <span word="and">and</span> <span word="in">in</span> <span word="warm">warm</span> <span word="weather">weather</span>, <span word="a">a</span> <span word="change">change</span> <span word="which">which</span> <span word="massively">massively</span> <span word="outstrips">outstrips</span> <span word="the">the</span> <span word="effect">effect</span> <span word="of">of</span> <span word="downloading">downloading</span> <span word="more">more</span> <span word="data">data</span>。</p><p><span word="By">By</span> <span word="comparison">comparison</span>, 3,500 <span word="paperbacks">paperbacks</span> - <span word="equivalent">equivalent</span> <span word="to">to</span> <span word="the">the</span> <span word="capacity">capacity</span> <span word="of">of</span> <span word="the">the</span> <span word="Kindle">Kindle</span> - <span word="would">would</span> <span word="weight">weight</span> <span word="around">around</span> <span word="two">two</span> <span word="tonnes">tonnes</span>。</p><p><span word="Prof">Prof</span> <span word="Kubiatowicz">Kubiatowicz</span>'<span word="s">s</span> <span word="findings">findings</span> <span word="are">are</span> <span word="based">based</span> <span word="on">on</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span>, <span word="while">while</span> <span word="downloading">downloading</span> <span word="an">an</span> <span word="e">e</span>-<span word="book">book</span> <span word="does">does</span> <span word="not">not</span> <span word="change">change</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="electrons">electrons</span> <span word="in">in</span> <span word="an">an</span> <span word="e">e</span>-<span word="reader">reader</span>, <span word="those">those</span> <span word="electrons">electrons</span> <span word="holding">holding</span> <span word="data">data</span> <span word="have">have</span> <span word="a">a</span> <span word="higher">higher</span> <span word="level">level</span> <span word="of">of</span> <span word="energy">energy</span>。</p><p><span word="The">The</span> <span word="relationship">relationship</span> <span word="between">between</span> <span word="energy">energy</span> <span word="and">and</span> <span word="mass">mass</span> - <span word="famously">famously</span> <span word="summarised">summarised</span> <span word="by">by</span> <span word="Einstein">Einstein</span> <span word="as">as</span> <span word="E">E</span>=<span word="mc">mc</span>2 - <span word="means">means</span> <span word="that">that</span> <span word="those">those</span> <span word="with">with</span> <span word="a">a</span> <span word="higher">higher</span> <span word="energy">energy</span> <span word="also">also</span> <span word="have">have</span> <span word="a">a</span> <span word="higher">higher</span> <span word="mass">mass</span>。</p>
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