The decision for today was this: prepare the slides for Friday, and then drive, or drive first and prepare later. This keeping in mind I'd be in Montreal and picking up Andrea at the train station. I chose to drive, then prepare, then pick up Andrea. The timing was perfect, but somewhere along the line I threw out my back, which made the walk to the train station an agony. This is Saint-Apollinaire, about 35 km in from Quebec City, where I stopped for lunch.