It is still just a wildly speculative hypothesis, Dr. King confessed, but she is taking it seriously enough to look for preliminary evidence that might support it.

Psychoanalysis provides at least a language for talking about these matters, and contains useful speculative hypotheses.

There are nevertheless a number of speculative hypotheses.

An even more speculative hypothesis is that intense radiation from a nearby supernova was responsible for the extinctions.

I thought it was a scientific theory and I found out little by little that it was a speculative hypothesis.

On the whole, none of the objectives were met, but the investigations served to rule out various speculative hypotheses.

Challenging problems faced physicists, then, as the nineteenth century gave way to the twentieth, problems calling for new speculative hypotheses designed to overcome these problems in a progressive way.

Several speculative and yet untested hypotheses suggest that endogenous DMT is produced in the human brain and is involved in certain psychological and neurological states.

His debut novel, Singularity (2004), explores the 1908 Tunguska event and the speculative hypothesis that it was caused by a submicroscopic, primordial black hole.

There is a speculative hypothesis on how and why a plant induces part of itself to die off.