Unless the entire wizarding population was Memory Charmed. Hermione wouldn't put that past those bastards. It was the kind of sweeping evil they were prone to. Hermione actually moaned at the thought. Imagine losing all knowledge of Harry to a spell? She didn't think she could bear that. She resolved to protect her mind from such an eventuality. If Ron ever came across that idea he'd probably curse her in her sleep. She'd wake up one day and Harry Potter would never have existed for her ...