Let us take another look at an issue we discussed both last week and the week before: the unity of science, and the issue of the demarcation of science from non-science. There are three intertwined ideas here we have to look at all at once: induction, causation, science. The problem of induction has been a constant in philosophy since David Hume (pictured). I can encounter a thousand white swans without ever having encountered a black swan. This should not necessarily give me confidence in the proposition "swans cannot be black". How, if at all, does the accumulation of examples produce a conclusion? Consider, too, causation. I hit a pool ball with the off-the-rack stick a thousand times. The ball always moves forward in the direction of my tap. It never blows up. Should this give me confidence in the proposition that it will never blow up? Relatedly, should this be enough for me to call my tap the cause of the ball's subsequent forward momentum? And such...