I just happened to be in the right place at the right time to see the creation of this awesome video of the Schlieren effect, an optical technique that highlights bent light. Here it shows heat convection coming off a candle flame, and later a blast of CO2 to extinguish it. Filmed at the Edgerton Center Strobe Lab using a 300fps high-speed consumer camera (Casio EX-F1). Look for a potential follow-up from one of this year’s 2.009 teams that might use this to image their project, a microwave fire detector/suppressor.