Millions know him simply as “Dr. Joe,” the McGill University chemistry professor who has spent the last 30 years popularizing science, exposing frauds, charlatans and quacks of all stripes, and defending the scientific method with passion, wit and clarity. For the last 15 years, Schwarcz has conducted a lot of his work from the McGill Office of Science and Society in campus quarters lined with several thousand science books and dozens of rubber ducky “quacks” he’s collected.