So, to everyone who says that evolution is "just a theory", know this: Your idea of theory and the actual definition are different. Colloquially, a theory is simply a hypothetical. Like, creationists will behave as if Darwin got high and said, "You know, what if all life had common ancestors?" And that's it. In reality, a scientific theory is a rigorously tested hypothesis that has been accepted as fact in the scientific community, can predict outcomes of related problems, can be interpolated and extrapolated with accuracy, and adequately explains natural phenomena. Saying that evolution is a theory is actually a good compliment. Theory is the highest quality a scientific idea can achieve.