Hi Trina,I enjoyed our conversation about technology & math education in Washington on Wed. Here's a link to the video that overlays the Geometer's Sketchpad sketch on the spinning bicycle wheel:	www.youtube.com/watch?v=lVimuh1xWf4I would like to invite you to join us for a session at NTLS next Thursday to discuss Digital Video in Math & Science:	www.ntls.info