Science relates to knowledge in areas of study which can be tested by hypothesis using the black swan theory. This process involves the positing of testable explanations (and predictions).
The black swan theory is that despite how many black swans you see, this is no proof that white swans don’t exist, simply that you haven’t bumped into a white swan yet. So you can’t prove that there are no white swans (by not bumping into a white swan), but can only disprove that there are no white swans (by bumping into a white swan). Thus, goes the theory, that in science, you can never prove something, but only disprove it.