Is That a Fact?

A thought for today, from David Bohm:

When we say 'this is a fact' we then imply a certain ability of the fact to 'stand up to' a wide range of different kinds of testing. Thus, the fact is established, i.e. it is shown to be stable, in the sense that it is not liable to collapse, or to be nullified at any moment, in a subsequent observation of the general sort that has already been carried out. Of course this stability is only relative, because the fact is always being tested again and again, both in ways that are familiar and in new ways that are continually being explored. So it may be refined, modified, and even radically changed, through further observation, experiment, and experience. But in order to be a 'real fact', it evidently has, in this way, to remain constantly valid, at least in certain contexts or over a certain period of time.