You may have seen the photo circulating on social media. It shows five middle school girls on a stage, holding awards in their hands. Why is it popping up in social feeds? For the first time, girls swept the top awards at a national STEM - Science, Technology, Engineering, and Math - competition. But getting girls to continue pursuing STEM, and eventually launching careers in STEM, remains a challenge. It’s one that Lockheed Martin’s C-E-O, Marillyn Hewson, it tackling.