Biology: Saving the Cave Paintings

For more than 16,000 years, the prehistoric paintings in France's famed Lascaux Cave survived in splendid isolation. Then, after the discovery of the cave by four French schoolboys in 1940, man returned to the scene. He brought with him a mysterious blight that threatened to obliterate in a few short years the magnificent red cows, free-floating horses and other majestic creatures drawn so long ago on the cavern walls by talented Cro-Magnon artists. Now the archaeological crisis has apparently passed. French scientists have successfully diagnosed the illness of the ancient art gallery...