You come up with a great idea, but moving that new discovery from theory to practice or from the lab to the marketplace, that's a challenge.

WHITEHOUSE: Winning the Future with Clean Energy

Dr Hill had predicted this outcome, thanks to error-management theory the idea that when people (or, indeed, other animals) make errors of judgment, they tend to make the error that is least costly.

ECONOMIST: Flirting

In theory, could we or might that be a good idea?

WHITEHOUSE: Press Briefing

He promoted the idea that the rightness or wrongness of an action depended on its consequences, an ethical theory known as utilitarianism.

ECONOMIST: John Harsanyi

The Web 2.0 movement is based, in theory, on the idea that everyone on the Internet gets to have his or her say.

FORBES: Magazine Article

In the Anglo-Saxon world Lamarck's name, if it is known at all, is associated with a theory long since discredited - the idea known as the inheritance of acquired characteristics - the idea that traits or attributes acquired or learned in the space of your life time will somehow be inherited by your children at birth.

BBC: Part Three - France and the World