Am I to conclude from this that science is incapable of bias?
How do you derive from the claim that science is good at policing it's biases that it is incapable of bias--unless you are more interesting in scoring propaganda points than in making sense?
Is it incumbent upon science to declare that only "natural" explanations are qualified as explanatory of the universe when the word "natural" only means what is commonly known and observed?
Well, no--if you have stated your question correctly. But when scientists are yanked away from their work to tell yet another loony-infested schoolboard what science is, they generally point out that all scientific theories are provisional, and will forever be open to question, and will often also point out that scientific explanations, due to their limited scope of interest only in material evidence, has no competence whatsoever concerning metaphysical explanations of the universe.
You have demonstrated well that you fail to police your own a-priori assumptions. As I said, I hope you are not a professional scientist or a teacher.
You have demonstrated well that being patronizing and snotty is one possible tactic for trying to give your reasoning the patina, if not the actuality of substance.
I hardly believe evolutionists think themselves "yanked away" from important work when the propagation their dogma is at stake. Whatever scientists testified at this Kansas hearing did so out of a sense of duty, as if human knowledge is threatened by omitting the word "natural." They need to see to it that students are flogged with their version of "science" and are, under no circumstances, allowed free thought.
You have demonstrated well that being patronizing and snotty is one possible tactic . . .
I tend to reply with the same tone in which I am addressed. You and your ilk have been "patronizing and snotty" from the get go, pal. I do not foresee any change in that regard. There is, however, substance behind the suggestion that you refrain from professional science and teaching unless you offer a qualifier or six. The philosophy room is down the hall to the left.