The key lies in the X-ray emission signatures of the two scenarios.

The key lies in the facilitator and how he or she facilitates the learning process.

The key lies with the unions that effectively have the power to decide who will take over the paper.

Even now, acknowledging that he has thought long and hard on the matter, he's fairly convinced the key lies in the songs themselves.

The key lies in the principles used to train élite military corps all over the world.

"I have a feeling the key lies with the doctor," she said.

The key lies in the first part of the title.

But the key lies with the 15.3pc who have not yet made up their mind and the 9.9pc who declined to say.

I believe that the key lies in greater investment in research and development.

As always, ladies and gentlemen, the key lies in the prices.