"Jason: Let’s talk about running surfaces. You make the claim that shoes are required because our modern environment is not barefoot-friendly.
"Zippy: That’s right. In the ancient world, everything was soft and squishy. Sharp pointy thing simply did not exist. Neither did hard surfaces. Our ancestors did not have to worry about the hazards we face today. Ask any geologist… they will tell you we didn’t see the appearance of rocks until 1972."