Pretty much everything our math teachers told us about how we would never be able to carry a calculator around in the future was lie. Turns out, you don't need to memorize the multiplication tables. You don't need to master the art of perfect cursive because "that's the only way adults write." Proper typing skills are helpful, but definitely not necessary, and we can all live our lives safely and happily without ever knowing Shakespeare's exact birthday or how many blueberries Stephanie had in her basket versus how many apples Johnny had.
Still, teachers must follow a curriculum and that curriculum almost always unfortunately includes a whole lot of information you'll never need on why the nucleus is the brain of the cell. So, when a recent Reddit user asked, "Students of Reddit, what is the most useless piece of information that you've been taught at school?" people were ready to share.