FRANKFURT AM MAIN, GERMANY - SEPTEMBER 15: The Porsche Mission E , stands at the Porsche stand at the 2015 IAA Frankfurt Auto Show during a press day on September 15, 2015 in Frankfurt, Germany. The IAA, Germany's biggest auto show, which takes place every two years, will be open to the public from September 17 through 27. (Photo by Hannelore Foerster/Getty Images)
