For any course-related matters (including questions about material, grades, logistics, etc.), please send your question via Piazza. This makes it MUCH easier to ensure that we respond to all course-related questions quickly. However, if you have something of a more personal nature, you can send Professor Roth a private message on Piazza. He will make a concerted effort to respond to all messages within 24 hours on weekdays and 48 hours on weekends. You're also welcome to stop by office hours anytime to talk about the course or anything else that interests you.