When I was in graduate school, a couple of my colleagues said “there are no facts.” I was astonished, and argued the point. Now, I think that there are no facts as we normally understand them, only interpretations of what we perceive, some of which may come close to the mark, and some miss entirely. The problem is, each person has a different view on which opinions have hit the mark, and in all too many cases, there is no real objective test. I wish there were a sounder basis for certainty of knowledge, but in very many spheres, I don’t think that there is, or perhaps can be. We are pretty good when the problem is concrete, and the results easily observable and repeatable. Much of what we are concerned with does not have these characteristics. Science, if well done, may help move us in the right direction, sometimes.