app.controller('HomeController', ['$http', function($http, $firebaseAuth) {
  console.log('HomeController running');
  var auth = $firebaseAuth();
  var self = this;

  self.logIn = function() {
    auth.$signInWithPopup("google").then(function(firebaseUser) {
      console.log("Firebase Authenticated as: ", firebaseUser.user.displayName);
    }).catch(function(error) {
      console.log("Authentication failed: ", error);
    });
  };

  self.dataArray = [
    {
      src: 'http://www.parasholidays.in/blog/wp-content/uploads/2014/05/holiday-tour-packages-for-usa.jpg'
    },
    {
      src: 'http://clickker.in/wp-content/uploads/2016/03/new-zealand-fy-8-1-Copy.jpg'
    },
    {
      src: 'http://images.kuoni.co.uk/73/indonesia-34834203-1451484722-ImageGalleryLightbox.jpg'
    },
    {
      src: 'http://images.kuoni.co.uk/73/malaysia-21747826-1446726337-ImageGalleryLightbox.jpg'
    },
    {
      src: 'http://www.kimcambodiadriver.com/uploads/images/tours/kim-cambodia-driver-angkor-wat.jpg'
    },
    {
      src: 'https://www.travcoa.com/sites/default/files/styles/flexslider_full/public/tours/images/imperialvietnam-halong-bay-14214576.jpg?itok=O-q1yr5_'
    }
  ];
}]);

//------------------------ SCIENCE PICTURES FROM MARK------------------------ //
// {
//   src: 'http://www.scind.org/content_images/full/1422719896Genome.jpg'
// },
// {
//   src: 'http://www.technology.org/texorgwp/wp-content/uploads/2015/10/18167.jpg'
// },
// {
//   src: 'https://i.ytimg.com/vi/-Wc_7_1PYis/maxresdefault.jpg'
// },
// {
//   src: 'http://cdn3.bigcommerce.com/s-8y8vwv/product_images/theme_images/5590295e7495e.image.jpg?t=1459712154'
// },
// {
//   src: 'https://s3.amazonaws.com/classconnection/580/flashcards/6473580/jpg/carcharodon_carcharias-1493631F70B6169541E.jpg'
// },
// {
//   src: 'https://s-media-cache-ak0.pinimg.com/originals/4c/0b/23/4c0b2337981a1eb4aab3eb3dc0df5465.jpg'
// },
// {
//   src: 'http://www.publicdomainpictures.net/pictures/180000/velka/antelope-canyon-rock-formation.jpg'
// },
// {
//   src: 'http://www.symmetrymagazine.org/sites/default/files/styles/2015_hero/public/images/standard/CMS-s_0.jpg?itok=y0aRfGCC'
// },
// {
//   src: 'http://circuits-central.com/wp-content/uploads/2015/09/home-2-1024x631.jpg'
// },
// {
//   src: 'https://i.ytimg.com/vi/e6dS6grtt_w/maxresdefault.jpg'
// },
// {
//   src: 'http://microbe.net/wp-content/uploads/2016/09/STS132_undocking_iss2.jpg'
// },
// {
//   src: 'https://cdn.pixabay.com/photo/2013/03/17/07/16/industry-94448_960_720.jpg'
// },
// {
//   src: 'http://www.nasa.gov/sites/default/files/synergy_0.jpg'
// }

@@ -35,16 +35,33 @@
 '$http',
+ '$firebaseAuth',
  functio

Add to import section of HomeController