The insurgency is not a single-headed beast, but rather a loose affiliation of many different groups that rarely act in a coordinated way.

NPR: Zarqawi Hideout Yields 'Trove' of Materials

CouchDB and MongoDB are essentially single-headed databases, and from that standpoint, availability is a function of how long you can keep the hardware running.

FORBES: What You Need to Know About NoSQL Databases

Children living in single female-headed families were more than four times as likely to be living in poverty, and six times as likely to be living in deep poverty, than children living in married couple families.

FORBES: Why the National Debt Negotiations Matter to Women

It has given the 22-headed alliance a single face, that of Mr Vajpayee.

ECONOMIST: Greater expectations

In a 2012 study of single motherhood in the United States, the advocacy group Legal Momentum found that three-quarters of homeless families are headed by a single mother.

FORBES: New York City is Making Women and Children Homeless

This may prove the biggest single-market argument since the current commission, headed by Romano Prodi, took office eight months ago, and Mr Bolkestein succeeded Mario Monti, an Italian, who moved across to handle competition policy.

ECONOMIST: The bruiser from Brussels | The

After a brief stint at CNN, where he had also worked early in his career, Olbermann headed back to MSNBC and almost single-handedly revived the channel.

CNN: Bring Keith Olbermann back to ESPN

Most African-American homes are headed by these single moms who need help, but more often than not they're looking to their own families where maybe they didn't have the help that they needed.

NPR: Technology Meets Single Motherhood

Some married-parent families struggle, just as some families headed by cohabiting or single mothers thrive.

WSJ: The New Unmarried Moms