But he's going to prove his theory or die trying.

She looked around the room for something to prove her theories.

But just then, he had no further opportunity for proving his theory.

"Would you like to touch it and prove your theory?"

He discovered in a dream how to prove his theory.

Proving his theory would require that he break the law.

"It goes to prove my old theory that we probably had a few more decades left," he said.

I'm sorry that he didn't conduct any research to prove his theory!

"There is absolutely no way you can prove your wild theories."

But I had proved my theory and the heart of the scam.