Elon Musk, co-founder of SpaceX and Tesla Motors, speaks at the California Institute of Technology commencement ceremony in Pasadena

 
Elon Musk, co-founder of SpaceX and Tesla Motors, speaks at the California Institute of Technology commencement ceremony in Pasadena
Elon Musk, co-founder of SpaceX and Tesla Motors, speaks at the California Institute of Technology commencement ceremony in Pasadena, California June 15, 2012. REUTERS/Phil McCarten