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<span style="font-size: 18px; margin-bottom: 6px; display: block;"><a name="www_scientificamerican_com_art" id="www_scientificamerican_com_art" style="color: rgb(242, 118, 112); font-weight: bold; text-decoration: none;" href="http://links.email.scientificamerican.com/ctt?kn=108&ms=NDgyNDc4NTYS1&r=NTY1MTUwMTIyOQS2&b=0&j=NjQyMTUxMzQ1S0&mt=2&rj=NjQyMTUxMzQ1S0&rt=0">Burning Rings of Fire</a></span> “Firewalls” of particles may border black holes, confounding both general relativity and quantum mechanics<br /><span style="font: 11px/20px arial; font-size-adjust: none; font-stretch: normal;">Joseph Polchinski</span><div style="padding-top: 10px; padding-bottom: 0px; font-family: Helvetica, sans-serif; font-size: 11px; margin-bottom: 0px;">ONLINE ONLY:</div>
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