Not only is our host Diego a super-nice guy, he’s given us some great advice about stuff to do in Madrid. This morning we took his suggestion to go to El Museo Geominero, a geology & mineral museum next to the School for Mining Engineers. It was an outstanding synthesis of vast simplicity, natural beauty, and hard information in an elegant building. Only a stone’s throw from our apartment. It rocked! We dug it. Mine this video…