title: Differences between strong and weak in Objective-C
body: <p>I'm new to Obj-C, so my first question is:</p>
  
  <p>What are the differences between <code>strong</code> and <code>weak</code> in <code>@property</code> declarations of pointers to objects?</p>
  
  <p>Also, what does <code>nonatomic</code> mean?</p>