Vitalizing the lecture: Lap-dissolve projection

Lap-dissolve projection is provided by two slide projectors focused on the same screen and coupled by a control unit that maintains constant illumination of the screen while switching or alternating between projectors. This technique enables lectures to visually simulate motion and change, which can contribute significantly to the development and understanding of physical and temporal concepts. Beneficial effects observed with chemistry students include improved concept comprehension and information retention, confidence building in laboratory situations, and generation of enthusiasm.