Psychologist Nicholas Humphrey coined the term "the biological advantage of being awestruck" to describe his theory on why our unique ability to be enthralled was, somehow, biologically selected for in a Darwinian sense.

CNN: Can ideas get you high?

Even routine administrative spending could in theory affect a party's ability to campaign.

ECONOMIST: Neill and the cash machine | The

The site in theory provides Zynga some independence from Facebook and the ability to build its own user base directly without Facebook.

FORBES: Zynga Drops Facebook Sign-in Requirement On Zynga.com

"Inventory planning, your systems, your ability to scale... that's all great in theory, " he says.

BBC: American Giant: The problems of being an overnight success

In theory, the presence of private shareholders in DB ML should reduce its ability to win special treatment from DB Netz, though Mr Mehdorn will, bizarrely, continue to head both DB and DB ML. The privatisation represents a step towards the British model, in which private firms run trains on a state-owned network.

ECONOMIST: German railways

One theory, the primary proponent of which is Luca Turin, purports that the secret lies in the ability to detect the quantum states of the odorants.

FORBES: When Biology and Quantum Physics Collide