Hello MMO-Champion posters!
This thread is about things you have learned that weren't correct, or exactly correct, such as a misconception that is pervasive in a particular country, province, state or wherever you live. I'm thinking more so about objective misconceptions. Lines become blurred when its personal. Unless you can provide a powerful argument supported by trusted sources then try to keep it objective.
An example is that Earth having a far more circular orbit than an ellipse. When I was a child we learned about how the Earth travels around the Sun in an elongated ellipse. How this misconception came to be for my teachers I will never know. Recently I've been trying to unwind my misconceptions and relearn much of what I've been taught. I know Earth's orbit is not a perfect circle, but it is near perfect. Definitely not the elongated ellipses I was taught in school.
What have you learned that you later found out wasn't true? It might be helpful to the next reader or poster. If you can provide some link that helps dispel the misconception then that would be wonderful!