 As a result of such developments, besides continuing to work on the issues which had always been on his mind, namely induction, confirmation, probability and the nature of scientific inference, Salmon became deeply interested in the philosophy of space and time, publishing the introductory book Space, Time, and Motion (1975a), which can be considered a pearl of clarity; the collection Zeno’s Paradoxes (1970a); and a number of subsequent papers. During his years at Indiana University Salmon started working also on explanation, a subject that remained at the heart of his production for the rest of his life.