Kate knew some things about Muggle mail, because her parents sometimes got letters from their Muggle friends. The first year listened to the responses around her, trying hard to come up with something that hadn't already been said. She finally raised her hand, unsure if this had already been shared but wanting to at least say something anyway.

"If you have something to send to another person, you have to put it in an envelope and seal it," she said. "You write the address of their house on the envelope, and somebody brings the mail to the recipient's house." This meant that if the recipient wasn't home, they couldn't get their mail until they got home. Owls would be able to find people wherever they went.