title: Simple Nokogiri not working: undefined method call for "Nokogiri"
body: <p>I have Ruby and the Nokogiri gem installed. In irb, I try:</p>
  
  <pre><code>require 'nokogiri'
  require 'open-uri'
  
  url = 'http://www.amazon.com/The-Pragmatic-Programmer-Journeyman-Master/dp/020161622X/ref=sr_1_1?ie=UTF8&amp;qid=1380758047&amp;sr=8-1&amp;keywords=the+programmatic+programmer'
  
  data = Nokogiri::HTML::(open(url))
  
  puts data
  </code></pre>
  
  <p>I always get the same error from the "data" variable. </p>
  
  <pre><code>NoMethodError: undefined method 'call' for Nokogiri:Module
    from (irb):5
    from C:/RailsInstaller/Ruby1.9.3/bin/irb:12:in '(main)'
  </code></pre>
  
  <p>I'm new with programming, so this may be something very obvious. Excuse my ignorance. </p>