Calling Leonardo "Da Vinci" is like calling me "Of Bude" instead of Steve (I've been called worse). Vinci is merely the town in Tuscany where he came from. In context, "Leonardo" is just fine, in other words as long as you're talking about the great Italian polymath, not "Titanic."

I hadn't heard the story of Copernicus's grave. What a great piece of science.