In exactly the same way you have never seen an x-ray or an electron or a molecule, yet they exist. You haven't seen solid rocket propellant, I will bet. You haven't seen radio waves. You haven't seen a computer compute, have you? You rely on a LOT of information that does not come to you directly. That is what education is for. That is what the edifices of science and of history are for. I've seen the footage, heard the eyewitness testimony, seen the bomb residue, and was cleared for Critical Nuclear Weapon Design Information...and was briefed into some special access pertaining to same. Have you been to Africa? How do you know it even exists?

Given the state of the world today, how do you propose anyone would get an opportunity to see a nuclear detonation (and survive)? And just because we want to avoid such an event, you take that as meaning they can't happen? What is your position on volcanic eruptions? Are they fake also?

You can push yourself into a corner of having no knowledge of most everything, since a single human being is not going to encounter everything. That leads to a life of profound ignorance, because you deny yourself the knowledge that would otherwise help you discern truth from something questionable. This guy Palmer has a problem with a bomb detonation photograph---because he is an idiot who doesn't understand what he is looking at. So, of course he goes bat-shit. This degree of paranoia gets into psychosis territory, so rethink what you are doing. Learn more and doubt less. I'm not saying there aren't liars out there, but if everyone was lying, we would have no civilization.

I will reserve judgement on viruses, but the fact that there are scanning electron microscope photographs of them gives a head start to their reality. You can't take pictures of something that doesn't exist.