A brother and sister have created a life-saving app together. Hannah Lucas, 16, has a heart condition called P.O.T.S that causes her to feel dizzy and lightheaded. As a result, she struggled in school and developed depression. Hannah and her 13-year-old brother, Charlie, came up with an app to alert someone in case of an emergency. It's called "Not Okay." InsideEdition.com's Leigh Scheps (http://twitter.com/LeighTVReporter) has more.