do ghosts exist??

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wot happens to a person after death??does he come back from his ashes in an intangible,invisible form??i've heard people saying that they have met ghosts,talked to them and stuffs,well i to be very frank haven't seen one.i've heard people say that u'll feel like someone pushing u frm u'r back when u go to a particular place n stuffs like that..has anyone seen ghosts??please be frank,we need genuine answers,not made up stories