A strange theory had been forming in his mind.

That may be why people form strange theories.

They received his strangest theories without a twitch of the mouth.

He was popular among the students, who would gather round him after his lectures and listen eagerly to his strange theories.

He had some strange theories, I remember, about the power of the human will and the effects of mind upon matter.

I saw a strange apparatus, and I heard a very strange theory.

A very strange theory, that about death," he said.

I shall venture to put forward a strange theory about them.

As for who benefited from his, there are still a million other strange theories.

It was a pretty strange theory, and she was nervous about how the others would receive it.