LISTEN: Going one step further

<span style="font-family: Interstate, " lucida="" grande",="" "lucida="" sans="" unicode",="" sans",="" garuda,="" verdana,="" tahoma,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(242,="" 242,="" 242);"="">Joylette Hylick discusses the new Nat Geo book about her mother Katherine Johnson. "One Step Further" is written for children and tells the story of the famous mathematician whose work with NASA was critical to the success of the first and subsequent U.S. crewed spaceflights all while breaking the color and gender barrier.