In India we have a special science for it — jaati smaran, remembrance of the past. A certain meditation, certain preparations and you can enter into past lives. But remember that you have to have the stamina and the guts not to get lost. Only in the East has reincarnation been considered. And the three religions which have born in India are the only religions which have an absolute agreement on the point of reincarnation. They differ in their philosophy, theology, on everything, but not on rebirth. It is factual to all of them. They all have come in their meditations to the same place. They cannot deny it. It is an existential fact that you have been before and you will be after your death. The one that was before birth, and the one that will be after death is the same one. Its name is the buddha. Its name is the witness. It never dies and it never is born.