title: Why do some angular commands use {{}}?
body: <p>What is the difference  between these two (why is one in {{}} and one in "")?</p>
  
  <pre><code>&lt;body ng-controller="StoreController as store"&gt;
  
  &lt;img ng-src="{{store.product.images[0]}}" /&gt;
  </code></pre>
  
  <p>Oh, I think I see it now.  The Store controller as store is a function, and the store.product.images[0] is a string, right?</p>