Video is an increasingly popular medium for education. Motivated by the problem of video as a one-way medium, this paper investigates the ways in which learners» active interaction with video materials contributes to active learning. In this study, we examine active viewing behaviors, specifically seeking and highlighting within videos, which may suggest greater levels of participation and learning. We deployed a system designed for active viewing to an undergraduate class for a semester. The analysis of online activity traces and interview data provided novel findings on video highlighting behavior in educational contexts.