“Goodnight Christopher!” I watched my mother in law as she climbed the stairs to her bedroom and I heard the door close behind her as she went off to bed, carrying the mug of hot milk her considerate son in law had made her as a nightcap. She always said coffee kept her awake. I smiled to myself – this particular mug of milk was intended to have the opposite effect. If my contact with the chemistry degree was telling the truth my old bitch of a mother in