How do I use $rootScope in Angular to store variables?

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How do I use $rootScope to store variables in a controller I want to later access in another controller? For example:

angular.module('myApp').controller('myCtrl', function($scope) {
  var a = //something in the scope
  //put it in the root scope
});

angular.module('myApp').controller('myCtrl2', function($scope) {
  var b = //get var a from root scope somehow
  //use var b
});

How would I do this?

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