title: When using AngularJS's $timeout, what's the default delay?
body: <p>On the remarkably brief <a href="http://docs.angularjs.org/api/ng/service/%24timeout" rel="noreferrer">AngularJS $timeout documentation page</a>, the 'delay' argument is stated as optional.  When using $timeout without specifying a delay, I note that a delay is still applied.  </p>
  
  <p>Can anyone tell me how much time is allotted for the delay when the argument is left implicit? </p>