The nature knows of no such thing as a quasar.

And why not, for the old adage has always been that nature knows best.

They're making an experiment, but what nature it is we don't know.

It was only now that appreciate what nature has known all along.

"That the nature of warfare as we have known it has changed now."

It was because of tradition, sanctity, about which nature knew nothing.

But the nature of that Something she did not know, and could not guess.

The nature of these planes is, for the time being, fully known only to the developers.

His nature is not knowing the true nature of the things here.

But the nature of the episode I did not know.