Bezos told the story of a road trip with his grandparents when he was ten years old. His grandmother was a smoker, and young Jeff — who loved math puzzles — calculated exactly how many years of her life she had shortened by smoking, then proudly announced it from the back seat. Instead of praising his cleverness, his grandmother burst into tears. His grandfather pulled the car over, looked at him quietly, and delivered this gentle rebuke that Bezos said shaped the rest of his life.