"Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and plays a role in various other fields, like epistemology and law." https://en.wikipedia.org/wiki/Empirical_evidence. If I tell you not to put your hand into the toaster do you need to see a video of someone putting their hand into a toaster?