In the fourth and final lecture, we examine the notion of ‘objective fact’ on which scientific theories are built; what sort of fact is such that we can build a scientific theory on it?

In the fourth and final lecture, we examine the notion of ‘objective fact’ on which scientific theories are built; what sort of fact is such that we can build a scientific theory on it?

In the third lecture we examine first the so-called “Gettier Problems” for the traditional account of knowledge, the arguments for saying that possible worlds exist and finally we ask whether there really are unactualised possibles.