Gesture is intimately entwined with human language and thought. It is a tool for communication as well as cognition: conveying information to interlocutors, orchestrating interaction, and supporting problem-solving and learning. Over the past 25 years, the community of scholars interested in gesture has grown from a specialized group to a multidisciplinary community incorporating gesture into a wide range of topics. Erica Cartmill discusses the most intriguing findings and questions in gesture research.