moral truth

To demonstrate not only the difference between scientific/descriptive knowledge and metaphysical/prescriptive knowledge, but also the greater degree of both accessibility and authority in the latter, consider the following:

There are scientific experiments which everyone knows (accessibility: tick) without question (authority: tick) simply should not (prescriptive: tick) be performed ((and there honestly is no need for me to give examples of such experiments)).

EDIT: lest it need to be said, the previous post makes no claim, of course, for human omniscience in any area.