[Piers]

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Philosophy # 1: When John Doe dies, his world has ended.

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Sure.

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When Jane Smith is concieved, her world has begun (out of nothingness).

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I think the process by which consciousness evolves in a growing embryo/infant is a biological question not a philosophical one.

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John Doe is reincarnated as Jane Smith, but without any memory of John Doe, or any physical/psychological connection to him.

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Sorry I don’t understand; the sentence does not mean anything to me, urgently need definition of reincarnated.