I've been wondering this for a while... when looking at Wikipedia entries for cities, it usually shows a "demographics" section. This section has data that makes no sense to me whatsoever. For example, for Gainesville, FL it shows:
"There are 37,279 households out of which 22.3% have children under the age of 18 living with them, 32.5% are married couples living together, 13.3% have a female householder with no husband present, and 50.8% are non-families."
To me, this implies that married couples living together are considered a "family", and so are "female householders with no husband present"... everything else is a "non-family". Dude, WTF? Why aren't male householders with no wife considered a "family"? Or unmarried couples living together? And where are the data for these demographics anyway? Why isn't it included?