On Second Thought for Friday, July 19, 2019

Every day, millions of Americans use -and often rely on- GPS
technology to help them navigate their commutes and get precise
directions to their destinations. As Americans celebrate the
upcoming 50th anniversary of the Apollo 11 moon landing, they can
thank the work of a Princeton University graduate, Todd Jaegar, who
conceived and developed the Apollo 11 experiment that enabled GPS
technology to take a “giant leap” forward. Meet a hidden figure
named Vicky Graves, who worked for NACA, the predecessor to NASA.