Orbital Debris: Educating People on Requirement Changes Knowledge Byte May 16, 2014 In this series, Nick Johnson, NASA's former chief scientist for Orbital Debris (OD), discusses orbital debris work at NASA. Johnson explains the challenges that accompany requirement changes and what it takes to overcome them. More Videos Feature Videos Learn about the Office of Safety and Mission Assurance, its disciplines and programs, and much more in these feature videos. Safety Messages Guest speakers deliver the monthly Safety Messages in these live recordings. Knowledge Bytes These short videos provide expert insight on various safety and mission assurance topics. Policy Bytes Policy owners explain recent changes to policies and standards in these short videos. Event Videos Video captures of live events on Safety and Mission Assurance topics.