The other side Evelyn

Many times when children ask questions the adults will say, “That’s just the way it is.” What does that answer mean? Why do the adults say that?
Children are always curious, but adults are sometimes too lazy to explain. Maybe they think children are too young to understand. And as the days go by, little children turn into adults, they are not curious anymore. Also, they don't want to spend time answering their children's questions.