The human race has only a 50/50 chance of surviving another century, says Sir Martin Rees, the Astronomer Royal, in his latest book - a work as thoughtful as the man who wrote it.
The Book of Revelations presents its own, hair-raising, account of the end of the world: "And, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; And the stars of heaven fell unto the earth."
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