My own opinion is that the intellect of modern man isn't that superior. IQs aren't that much different. Those Indians and medieval men were just as intelligent as we are, but the context in which they thought was completely different. Within that context of thought, ghosts and spirits are quite as real as atoms, particles, photons and quarks are to a modern man. In that sense I believe in ghosts. Modern man has his ghosts and spirits too, you know.