Well, I was thinking you thought these news somehow changed something when the feathered dinoasaurs in the group have been known for years and these findings were more of a prediction come true.

But yes, we don't know everything and our body of knowledge is evolving constantly and sometimes we will be wrong. Small things like the the exact look of dinosaurs that died millions of years ago are more likely to be untrue than something that is extremely well researched such as evolution or cell theory.

But to be honest I don't get what you want to say. Do you want us to say that we are not really sure that George Washington was the first president of the US in the textbooks? We define certainty and truth, that is why we have chosen to give them a meaning that is actually usable. Otherwise we could never use them.