If you’ve ever plopped down on your bed exhausted after chasing around your inattentive and hyperactive kid all day and wondered with self-doubt – “Could it possibly be me?” – a new study gives some credence to your worst fears. While scientists still haven’t determined the cause of Attention Deficit Hyperactivity Disorder and believe it is a mix of genetic and environmental factors, there’s a new theory about why the symptoms seem to go away in some kids but not in others.