In this paper we describe NAVRNA, an interactive system that enables biologists or researchers in bioinformatics to visualize, explore and edit RNA molecules. The key characteristics of NAVRNA are (1) to exploit multiple display surfaces (2) to enable the manipulation of both the 2D view of RNA called secondary structure, as well as the 3D view of RNA called tertiary structure while maintaining consistency between the two views, (3) to enable co-located synchronous collaborative manipulation of the RNA structures and (4) to provide two-handed interaction techniques for navigating and editing RNA structures and in particular a two-handed technique for bending the structure. Categories and Subject Descriptors H.5.2 [Information Interfaces And Presentation] User Interfaces - Graphical user interfaces, Interaction styles, Usercentered design. I.3.6 [Computer Graphics] Methodology and Techniques - Interaction techniques. General Terms Design, Human Factors, Algorithms. Keywords Visualizati...