Needle in a TimestackNeedle in a Timestack is Robert Silverberg at his very best intelligent, inventive, and visionary. This collection showcases his talent for thought provoking science fiction, ranging in themes from time travel to space travel, the media to mortality. In the titular story now a feature film by Oscar winning screenwriter John Ridley a jealous ex husband warps time in a vindictive attempt to destroy his former wife's new marriage. Thirty one identical