But when you looked deeper, the same old conundrums remained.

I believe that I've solved one of the oldest conundrums of natural philosophy by creating and proving the existence of a vacuum!

The old conundrum, reborn again.

The oldest conundrum, The Economist, October 30, 2008.

Yet the old conundrum of military history - what to do with the losers - remains unsolved.

The old conundrum faced him once again: how to read the history of the site from a haphazard pile of muck.

And he argues that an old anthropological conundrum - why it took man so long to develop agriculture - should now be posed in reverse.

Since the greensward commands so much attention at this season that old conundrum once again arises: To rake or not to rake?

It is an old conundrum.

In addition to the old conundrum, "Who is the king?"