"They can talk even without a cell phone."

Our daughter, who is in kindergarten, told us tonight at the dinner table about a boy who was being disruptive in gym class. The gym teacher called the homeroom teacher to come get the disruptive boy. Our daughter wanted us to understand that "they can talk even without a cell phone" using special "boxes in the wall that have buttons." When we explained that these were called "intercoms" she took it in stride (parents know a lot of things) but we surprised her when we explained that intercoms have been around for a long time and that cell phones only were invented recently (since Mommy and Daddy were adults). She thought her elementary school had some kind of really cutting-edge technology with these boxes in the walls.