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Databinding in angularjs

Could someone explain me how databinding works in angularjs framework? I haven't found technical details on their site . It's more or less clear how it works when data is propagated from view to model. But how angularjs tracks changes of model properties without setters and getters. I found that there is javascript watchers that may do this work. But they are not supported in IE 6 and 7. So how angularjs knows that I changed e.g.: