title: How would you plot a box plot and specific points on the same plot?
body: <p>We can draw box plot as below:</p>
  
  <pre><code>qplot(factor(cyl), mpg, data = mtcars, geom = "boxplot")
  </code></pre>
  
  <p>and point as:</p>
  
  <pre><code>qplot(factor(cyl), mpg, data = mtcars, geom = "point") 
  </code></pre>
  
  <p>How would you combine both - but just to show a few specific points(say when <code>wt</code> is less than 2)  on top of the box? </p>