anchor.diff:      <h1> use <b><a href="/datasets">snorkel</a> </b>
       and stop data <b>mishaps</b>
       </h1>
  +
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positive.code:       </div>
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negative.code:       </div>
      </div>
  
      <div class="clearfix">
        <h1 class="span6" style='text-align: center'><a href="<%= url_for('about.index') %>">take the tour</a></h1>
      </div>
      <div class="span4">
        <div>
        <h2>Highlevel</h2>
          <p>
            <b>snorkel</b> answers questions about the <b>here</b> and
            <b>now</b>.  You can think of snorkel like an <a
            href="http://en.wikipedia.org/wiki/Online_analytical_processing">OLAP</a>
            with amnesia. Snorkel stores <b>raw samples</b> in <b>datasets</b>
            and dynamically slices and aggregates them in real time. As the
            samples age, they can be set to <b>automatically expire</b>, keeping
            query times snappy.
          </p>
  
        <h2>When do I sample data?</h2>
  