In my view, there is a critical nuance in open-mindedness: It applies whether or not the idea is consistent with what I already believe to be true. As an open-minded person, I feel that I need to regularly reevaluate my beliefs as new information comes to light, even if that new information directly contradicts a basis for a firmly held belief.
I'm curious to know examples that you've had where you've learned new information that contradicted what you already firmly believed, and through open-mindedness, changed your belief accordingly.
Completely turned around when I read more about it and after a while realized that the boundary between human-made and natural chemical compounds is completely arbitrary. Realizing that nature has its fair share of deathly toxic substances too also helped.