Barcelona (Freddie Mercury and Montserrat Caballé song) important performance occurred on 8 October 1988, at the open air La Nit festival in Barcelona, which was staged on the occasion of the arrival of the Olympic flag from Seoul. Together, Mercury and Caballé sang three tracks from the forthcoming album "Barcelona", namely "Barcelona", "How Can I Go On" and "The Golden Boy". This was the last live performance of Mercury who was already beginning to suffer from AIDS. Mercury died in 1991, and the recording of the song was played over a travelogue of the city at the start of the international broadcast of the 1992 Olympics opening
Mercury battery popular power source for portable electronic devices. Due to the content of toxic mercury and environmental concerns about its disposal, the sale of mercury batteries is now banned in many countries. Both ANSI and IEC have withdrawn their standards for mercury batteries. The mercury oxide-zinc battery system was known more than 100 years ago but did not become widely used until 1942, when Samuel Ruben developed a balanced mercury cell which was useful for military applications such as metal detectors, munitions, and walkie-talkies. The battery system had the advantages of long shelf life (to 10 years) and steady voltage output.