Progression

Worried patient: 'Doctor, I'm very worried. I'm still suffering from exhaustion and fatigue when I come home from work every evening.'

Doctor: 'Oh, that's nothing to worry about. Just have a few drinks before your dinner - that will soon wake you up.'

Patient: 'Thanks very much, doctor! But when I consulted you before, you told me to cut out drinking alcohol completely.'

Doctor: 'Yes, so I did. But that was last week, old chap - and medical science has progressed enormously since then.'