I just started learning about Angular JS. Though I can code up an Angular 
module, I have lot of questions on how Angular works.

1. How does $scope work? I understand that one root scope is created at the 
point of declaration of ng-module. This represents the DOM in some way and 
also watches the DOM for any changes in properties, events, etc.. How does 
this watch implemented? 
2. How is it ensured that this scope object is ready once the page loads, 
so that it can be used by the controller? How does access permissions work 
with the scope object, cases where controller might not have access to a 
variable?
3. In which cases you might want to use an injector explicitly?
4. What's lifecycle of an angular app in detail? Is there any client side 
versus server side component or is it entirely client side? When I say, 
ng-repeat, this is still client side?

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