Immortality is an age-old obsession. Plenty of literature deals with the subject, from the Sumerian Epic of Gilgamish to the poems of Homer and the writings of the Old Testament. The quest to live for ever has motivated medieval alchemists, modern techno-Utopians and mystics through the centuries. In his survey of the subject, Stephen Cave, a British philosopher, argues that man's various tales of immortality can be boiled down into four basic "narratives". The first is the simplest, in theory at least: do what the medieval alchemists never managed and discover an elixir to simply avoid dying. The second concerns resurrection, or coming back to life after dying, a belief found in all three of the Abrahamic religions.
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