well, this is not a riddle but a question that ni had on my mind since a very long time..........
We all know that when ever we feel the presene of someone near us without touching, it is because of wave nature of matter (particle has dual nature- wave and particle). But many people have a sensation when they are dealing with ghosts. So , does this tells that ghosts are matter. But as far as i know ghosts are out of the science world?!?!!??!?!?!?!?!?!?!?!?!!!