title: iterating hash collection
body: <pre><code>{"Journal"=&gt;[[4, -785.0], 
               [13, -21.9165000915527], 
               [14, -213.008995056152], 
               [15, -50.074499130249]]}
  </code></pre>
  
  <p>How can you to iterate this hash in Ruby, and how would you to separate out keys &amp; values?</p>