well, yeah, the whole method of science is based on being open minded
there are always going to be close minded individuals in every group that ignore evidence, new ideas, etc
look at pseudoscience.
random: i got in an argument with my friend the other day about the 'healing power of crystals.' she was for it and i was against.
i made my case and she said, "if you'd only open your mind.. not be so close-minded" when in fact i'm totally open to any proof or experiments that can prove something other than w/subj validation; she is the one refusing to budge from her belief, regardless of experiments disproving it, etc