Hi all, :shy: I have a bit out of track question and may be this shall go to philosophy section. On one hand, I often see posts where some amateur/non physicist posts some speculative idea or hypothesis. Others go onto argue or suggest not to merely speculate and argue like I read somewhere speculating is a game in mind. Not factual or necessarily real. So dont go for it. On the other hand, I read essays/journals where professionals hypothesize. They reason what if? Why not this? In fact are not all philosophical texts by leibiz, russel, kant not mere speculations? What emperical basis are there in Kant's Critique of pure reason book or some other? So what demarcates philosophy/hypothesis from mere speculation? Thank You.