[exDemMom]

The two hypothesized that large methane bubbles rising from the ocean floor might account for many, if not all, of the mysterious disappearances of ships and aircraft at specific locales around the world.

I'm convinced/s.

That is pretty typical scientific writing. Scientists do not like to state anything as if it is a certainty, because there is always a very high chance someone will come along and prove them wrong. Learning to write this way is a large part of scientific training.

[SoldierDad]

As a psychologist, I’m well aware of how “scientists” write. But, thanks anyway.