His demand that world-class universities ignore hip hop is an odd cry for remedial provincialism: a return to a climate of academic curiosity where only a narrow range of subjects could be legitimately pursued.

NPR: Author Comes to Hip-Hop Music's Defense

Urban boosters, apartment-builders and greens--all advocates of expanding the renter class--tend to ignore several key facts.

FORBES: New Geographer

The complete absence of a black middle class allowed most advertisers to ignore black tastes and aspirations.

ECONOMIST: Free at last

Another change involves teacher training, which used to focus on educational theory but ignore practical techniques for keeping order in class.

ECONOMIST: Education: Behave, or else | The

Andrew Bindman, a doctor at San Francisco General Hospital, where a quarter of ward-time is taken up by homeless people, speculates that as the gap between the insured and the uninsured continues to widen, and as the number of those without coverage extends further into the middle class, it will become politically impossible to ignore.

ECONOMIST: California leads, but the rest of America is not far behind

The other, he says, is a class bias in the choice of what news to cover and what to ignore.

BBC: Why are India's media under fire?

No, its ride-leveling suspension and adaptive dampening won't turn it into a 540i, nor can you completely ignore the fact that it has a four-speed transmission (every other car in this class gets at least five cogs in the shift box) that sends power through the front, not back wheels.

FORBES: Size XL

Teaching the incoming class of 2011 proper habits with a credit card is ever so crucial, but most colleges and universities ignore this fact.

FORBES: Ellina Graypel: "Students Will Rally! Hurricane or Not!"