title: Angular2-Meteor zone() method
body: <p>In the angular2-meteor tutorial <a href="https://www.angular-meteor.com/tutorials/socially/angular2/3-way-data-binding" rel="nofollow">step3</a>, we use a zone method.
  Code:</p>
  
  <pre><code>import { Component } from '@angular/core';
  import { Observable } from 'rxjs/Observable';
  
  import { Parties } from '../../both/collections/parties.collection';
  
  ...some lines skipped...
    template
  })
  export class AppComponent {
    parties: Observable&lt;any[]&gt;;
  
    constructor() {
      this.parties = Parties.find({}).zone();
    }
  }
  </code></pre>
  
  <p>What exactly does Parties.find({}).zone() do?</p>