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href="https://mathvoices.ams.org/featurecolumn/2020/02/01/fc-2020-02/" rel="bookmark" itemprop="url">What’s the 411?</a></h2> </header> <div class="screen-reader-text" itemprop="datePublished" itemtype="https://schema.org/Date">2020-02-01</div> <div class="entry-byline"> <div class="entry-byline-block entry-byline-author"> <span class="entry-byline-label">By:</span> <span class="entry-author" itemprop="author" itemscope="itemscope" itemtype="https://schema.org/Person"><a href="https://mathvoices.ams.org/featurecolumn/author/admin/" title="Posts by Tim McMahon" rel="author" class="url fn n" itemprop="url"><span itemprop="name">Tim McMahon</span></a></span> </div> <div class="entry-byline-block entry-byline-date"> <span class="entry-byline-label">On:</span> <time class="entry-published updated" datetime="2020-02-01T10:35:22-05:00" itemprop="datePublished" title="Saturday, February 1, 2020, 10:35 am">February 1, 2020</time> </div> <div class="entry-byline-block entry-byline-cats"> <span class="entry-byline-label">In:</span> <a href="https://mathvoices.ams.org/featurecolumn/category/2020/" rel="category tag">2020</a>, <a href="https://mathvoices.ams.org/featurecolumn/category/columnists/david-austin/" rel="category tag">David Austin</a> </div> <div class="entry-byline-block entry-byline-tags"> <span class="entry-byline-label">Tagged:</span> <a href="https://mathvoices.ams.org/featurecolumn/tag/5g/" rel="tag">5G</a>, <a href="https://mathvoices.ams.org/featurecolumn/tag/claude-shannon/" rel="tag">Claude Shannon</a>, <a href="https://mathvoices.ams.org/featurecolumn/tag/polar-codes/" rel="tag">polar codes</a>, <a href="https://mathvoices.ams.org/featurecolumn/tag/weatherball/" rel="tag">Weatherball</a> </div> <div class="entry-byline-block entry-byline-comments"> <span class="entry-byline-label">With:</span> <a href="https://mathvoices.ams.org/featurecolumn/2020/02/01/fc-2020-02/#respond" class="comments-link" itemprop="discussionURL">0 Comments</a> </div><span 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