Are you kidding?!? Have you not heard of the Reproducibility Project - http://nonlin.org/hard-science-is-soft-science/ ?
Unlike Religion, Philosophy, or even the “soft” Sciences, “hard” Sciences are supposed to be falsifiable and therefore fact. But it turns out that’s not the case. Even one of the most solid of all theories, Newtonian Mechanics, has been proven false at the atomic level. Still, the set of theories has not been discarded because it works just fine at the macro size. The classical example of a falsifiable theory: “all swans are white”, can be modified after falsification to “all swans are white, except Cygnus atratus”, and the modified theory remains useful. For most people, a theory that ‘withstands falsification’ is as good as ‘confirmed’. We see Newtonian Mechanics at work every day ever since the pyramids or before, and we think “this is solid fact that will never change”. Not many people know or care that it breaks down at the atomic level.
Science is done by people that carry their own Beliefs – some clearly displayed, and some hidden. Assumptions, range of hypotheses under consideration, and results interpretation are all subjective. Furthermore, humans often suffer from group think. Verification is always limited due to constraints such as the immediate space-time, accuracy, repeatability, and so on. Proper disclosure would require the presenter to list all assumptions as well as all competing hypotheses along with confidence levels for each one of them and for the group of yet unknown hypotheses. For completeness, the Set of Beliefs of the presenter might also inform the audience as to what set of hypotheses were excluded from research.
Science is never settled – if it were, all discussions would stop, together with all scientific progress.