Lascaux’s earliest example of prehistoric cave art is being threatened by creeping black mold. Molly Moore’s article in the Washington Post describes how past preventions, such as a formaldehyde wash used to disinfect visitors’ feet has also eradicated the friendly organisms that would have killed and kept the mold in check. So far the spreading of the black spot has been stopped by spraying an ammonia based solution but human access and exposure to the elements may also be causing the problem. Whatever is the solution, these caves and their art should be saved. They cannot be replaced and it would be a grave loss to lose the original art.…