Bezos’s grandparents taught him a lesson in compassion that he related decades later, in a 2010 commencement speech at Princeton. Every few years Pop and Mattie Gise hooked an Airstream trailer to their car and caravanned around the country with other Airstream owners, and they sometimes took Jeff with them. On one of these road trips, when Bezos was ten and passing time in the back seat of the car, he took some mortality statistics he had heard on an antismoking public service announcement and calculated that his grandmother’s smoking habit would take nine years off her life.