Galileo wrote Two New Sciences (Discorsi e Dimostrazioni Matematiche Intorno a Due Nuove Scienze in Italian). It is presented as a three way discussion, among Salviati, Sagredo, and Simplicio. Galileo’s work is famous. The best selling book by Douglas Hofstadter, Godel, Escher Bach, presents some of its material using dialogues. What I have not found is a list anywhere of the best (or even any) scientific dialogues. Is there such a list? Are there any scientific dialogues which have been important to the history of science?