An amusing story about a monthly wailing noise that has been troubling the people of Swansea in Wales for the last two years (Google ‘Swansea siren’). Until recently the source of the sound was a mystery but much importance was attached to the fact that the city was heavily bombed by the Luftwaffe during the Second World War. Maybe the noise was the ghost of the warning sirens that sounded 75 years ago (http://tinyurl.com/jv7b26r)? Officials spent more than a year investigating the sounds, which start before dawn and go on into the early morning. Now the source has been traced to Vale Europe nickel refinery in nearby Clydach which is required to test its emergency evacuation procedure once a month. But will this explanation satisfy everybody?