I've learned so much from other people.  I mean, most the things I know are naturally a direct or indirect result of other people.  Anything I've ever learned through reading books and such was learned from some other person, but I think there's something to be said for directly interacting with other people.  And I don't think there has to be any intention by anyone to teach for people to learn from such experiences.  I think both learning and teaching have the potential to be both active or passive processes, which I think is in conflict with the popular conception of learning and teaching as dichotomy between learning as a process of passive absorbtion vs teaching as a process of active effort.