The national park has been called "the best idea America ever had."

She called the idea of her mother's having a second husband "gross."

That is the extreme of the idea called justice as fairness.

The Iraqi newspaper called the idea of a limited war "a big illusion."

In fact, it called into question the whole idea of serious institutional jazz programming.

And the world watched, waiting to see if this improbable idea called America would succeed.

He called the idea that the library's staff just wants a more professional and independent board "a red herring."

This calls into question the idea of effective solidarity with the people living in the affected regions.

His ideas, called Keynesian economics, had a big impact on modern economic and political theory.

This idea, called direct realism, has again become popular in recent years with the rise of postmodernism.