That's it. We are still learning about it. It's like working yourself over a stream by testing rocks then
stepping on them, or not, as you move. The uncertainty in that article is what science is all about.
Certainty in situations as this is only for those as dropdeadfred, rooster and the rest.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”