Features crash firefighter training at Lowry Air Force Base, Denver. Also: retired producer Arthur Hammerstein turns to inventing; crop wastes converted to alcohol for fuel; an undersea coal... Read allFeatures crash firefighter training at Lowry Air Force Base, Denver. Also: retired producer Arthur Hammerstein turns to inventing; crop wastes converted to alcohol for fuel; an undersea coal mine in Chile.Features crash firefighter training at Lowry Air Force Base, Denver. Also: retired producer Arthur Hammerstein turns to inventing; crop wastes converted to alcohol for fuel; an undersea coal mine in Chile.