‘Tis the season for sniffles and coughs and other symptoms of the common cold....

Ever notice how farmland is disappearing right before your eyes, only to be replaced by strip malls? Sprawl is part of this phenomenon-the unplanned, unchecked development of once-green space outside cities and towns. Features of sprawl include a haphazard building pattern, low-density residential and commercial development, a lack of town centers, and a dependence on cars.

Mold isn't just a patch of blue to indicate your bread's gone bad. There are molds that grow on...