Excalibur (film)
When first released in the United Kingdom in 1981, the film ran to 140m 30s, and was classified as a "AA" by the BBFC, restricting it to those aged 14 and over. In 1982, the BBFC replaced the "AA" certificate with the higher age-specific "15", which was also applied to "Excalibur" when released on home video.
Project Excalibur
The first announcement of a successful X-ray laser was made in 1972 by the University of Utah. Researchers spread thin layers of copper atoms on microscope slides and then heated them with pulses from a neodymium glass laser. This caused spots to appear on X-ray film in the direction of the layers and none in other directions. The announcement caused great excitement, but it was soon overshadowed by the fact that no other labs could reproduce the results, and the announcement was soon forgotten. In 1974, the University of Paris-Sud announced small laser gain in an aluminum plasma created by a pulse of laser light, but, once again, the claimed results were regarded skeptically by other labs.