In this Aug. 20, 2012 photo, Purdue sophomore Riley Avron shows an iPhone app used to control a test rover called Scarecrow, which is similar to the Curiosity Mars Rover, at Purdue University in West Lafayette, Ind. Avron worked at the Jet Propulsion Lab in Pasadena, Calif., over the summer where he helped create the iPhone app. (AP Photo/Journal & Courier, Brent Drinkut) MANDATORY CREDIT; NO SALES