"From their teenage years on, children are considerably more capable of causing parents unhappiness than bringing them happiness. That is one reason parents who rely on their children for happiness make both their children and themselves miserable."

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The most watched programme on the BBC, after the news, is probably 'Doctor Who.' What has happened is that science fiction has been subsumed into modern literature. There are grandparents out there who speak Klingon, who are quite capable of holding down a job. No one would think twice now about a parallel universe.

— Terry Pratchett