3 ms·

There are lizards or beetles that tumble down sand dunes. Maybe cartwheeling humans could lead to some adaptation where the whole body becomes the wheel.

• lupire 1y ago
  Wheels are not balls. Balls are common in nature. Wheels are not. The difference is that wheels need roads, which are not common nature and a large scale artificial objects.
  • ctack 1y ago
    That makes sense. Even in the Pullman book there were natural roadways for rolling.