They discover the practical value of a deliberate, persistent, wide-ranging search for ideas.

FORBES: Don't Build That Yourself

There have been persistent reports among those who have fled the country in search of food, of forced abortions for pregnant women returned by China, and of infanticide.

ECONOMIST: The things North Korea attempts to hide

The Google Desktop search tool is as speedy and accurate as its far-famed online search engine, though some people are alarmed by a persistent (and reeking of hogwash) rumor that it potentially compromises user privacy.

CNN: How do I retrieve a lost file?

Persistent cheats will have their benefit stopped, and investigators will be given new powers to search bank and building society accounts of suspects.

BBC: People queue in a benefits office