It is a cute play on words: Mercedes-Benz is using this year's Frankfurt auto show, a.k.a. the IAA (Internationale Automobil-Ausstellung), to launch a stunningly futuristic concept car, the Concept IAA (Intelligent Aerodynamic Automobile). Mercedes has a long history with aerodynamic vehicles both in the distant and in the very recent past. The Concept IAA takes aerodynamics to an extreme, sporting a drag coefficient of only 0.19, despite a disadvantageously short front overhang, large 22-inch wheels on 235/35 tires, and a plug-in-hybrid powertrain with significant cooling needs. It does so by means of active aero—changing its shape.