Abstract
I shall call the sense in which we know about galaxies and about the past "theoretical knowledge" and the corresponding beliefs, "theoretical beliefs." It is widely accepted now that not all knowing is theoretical knowing, but what the distinction between theoretical and non-theoretical knowing consists in is not equally clear. It is not even clear that there are not different kinds of non-theoretical knowing. In this paper I shall clarify the distinction between theoretical knowing and at least one kind of nontheoretical knowing, namely, knowing how to use tools. I shall use "knowing how to hammer" for my example.