So, why is that?

Some teachers know that children are good at learning when they have to know something, when they want to use their knowledge. These teachers don’t want children to learn then not to use that knowledge. They learn to read so that they can read books that they want to read. Teachers don’t tell them what to read. One child is interested in old families. He reads books about history. The other child is interested in art. She reads books about paintings.