Why philosophy not a science?

The discipline of philosophy sprung from various minds having different life experiences which helped to mold their way of thinking; their way of explaining life's vagaries. So, who is to say which model is correct? One point of view can be just as valid as the next. There is no empirical evidence to say which thinkers' viewpoint is the absolute correct one.

Whereas, science deals in hard verifiable facts which have been replicated by other scientists following the same experiment parameters. A fact, in science has been nailed down three ways from center using the Scientific Method, before it can be labelled as scientific fact.