If bananas started to get blue when they get sick, scientists would probably investigate the phenomenon in order to find a biological or chemical explanation. It is not impossible that these investigations would lead to the discovery of new phenomena. This may match the definition of what you call "changing what we believe to be true".

However, bananas changing colors is unlikely to happen, and if you meet a blue banana, it is more probably because of some food coloring than of a change in the fundamental nature of physics.
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