Is There a Rationalism in Science?

Cultural relativism and the fact that rational knowledge cannot be disentangled from the power relations, they are complete right. I'm not saying that they're wrong. They're completely right. We cannot step out from the cultural relationship and think that there is a absolute rationality like we cannot step out and say that there's no right and wrong. So let's not the black and white once again. But I think the cultural relativists have definitely something to teach to all of us in telling us the lack of certainty,. The lack of absolute rational standard of truth - but they get it wrong when from that they claim that there is no argument that we can play in arguing what is right