What is the most WRONG thing a teacher, professor, or school book told you?

https://lemmy.world/post/132705

What is the most WRONG thing a teacher, professor, or school book told you? - Lemmy.world

Geography teacher told us that the sun is green because if you put a welding mask on and look at it it'll be green.
incredible (⁠◕⁠ᴗ⁠◕⁠✿⁠)