Well, California's at it again -- going in a different direction than the rest of the country. The Census Bureau recently released a new report showed that -- by at least one measure -- the nation's overall population density dropped by 6% between 2000 and 2010. But by this same measure, the population density of most California metro areas -- where almost 90% of Californians live -- is going up. And density's going up faster in the smaller counties. What gives?