S1, E5: What's the relation between a World War II fighter jet and the baby stroller? A Joseph Pulitzer challenge and the evolution of air travel? A heated argument and the invention of vulcanized rubber? A running shoe and a waffle iron? Unlikely inspirations, fortunate accidents, and unwavering dedication highlight the stories of four innovations that transformed transportation and ushered in the modern age. We reveal what brought these amazing ideas to life, and made billions...though not always for the inventor himself.