Everything up until now is mere speculation on the possible origin.

And, once again, this is not a matter of mere speculation.

At the moment, researchers said, all scenarios are mere speculation.

Of course, this is still mere speculation on our part.

True investing has always been much more than mere speculation.

Much of what passed for analysis was mere speculation.

But I don't doubt you, nor do 1 think what you've said is mere idle speculation.

He did not want to say the word, as if his reluctance would make all of this mere speculation rather than fact.

However, much of this is mere speculation based on the individuals named being the same.

Some of that is mere speculation, I would guess.