The attraction of moths to a flame has long been known. This potentially fatal behaviour has intrigues and inspired writers and artists over the centuries. Moths also come to other forms of light at night. Many of us have observed moths beating on the pane of a lighted window or have seen them at rest around outdoor lights. Scientists have attempted to explain the behaviour, while others have simply exploited it. All sorts of traps have been designed around light sources. Some, like the familiar blue lights where food is prepared, catch and kill flying insects.