S17E4: Corn Tortillas, Crankshafts & Camshafts, Bush Planes, Aluminum Bike Wheels

Prepared corn dough is portioned, flattened and baked into tortillas. Engine components are forged or cast before being machined and hardened into crankshafts and camshafts; rugged airframes are equipped for bush flying; and aluminium rims, hubs and spokes are assembled into lightweight bicycle wheels.