Obviously a number of us use different types of social media like Twitter to communicate what the government is doing to the people in this country.

WHITEHOUSE: Press Briefing

In making a reconstruction of a building an archaeologist will use information from a number of coins, each of which may show a different perspective.

ECONOMIST: Bluma Trell

There are a number of different reactors in use, most commonly water-cooled pressurised or boiling water reactors - though other reactor types are kept cool with the help of liquid metal, gas or molten salt.

BBC: Will Japanese crisis curb the rise of nuclear power?

He appears in a number of different ways and can use thousands of different disguises.

FORBES: The Voice that Says You Can't

Just under a dozen states use the Caucus system - the number is different according to party.

BBC: Caucus

There are a number of different reasonable methods one could use that would result in a variety of different estimates.

FORBES: GOP Senator Knowingly Distorts GAO Report He Commissioned To Launch Most Dishonest Attack On Obamacare To Date

There are a number of different measures of inflation in use.

BBC: Q&A: Inflation explained

Supply chains come in a number of different forms, and some companies use more than one for different parts of their business.

ECONOMIST: Delivery companies are consolidating

Every retailer has their own algorithms that they use to present their best sellers and they are based on a number of different factors.

FORBES: Mark Coker: Indie Authors Are Underpricing Their Books

There are a number of different ways of computing capital or equity, but for now we can use the simple accounting definition.

FORBES: A Debt/Equity Swap To Recapitalize European Banks: A Real World Example