Hi, On Fri, 23 Jun 2006, Pádraig Brady wrote: > So 10% of the male population need to learn traffic light positions > rather than colours? A friend of mine was at the military and had to check new recruits for color-blindness. Only after the 20th color-blind man in a row he realized for the first time in hist life that it was _him_, being the color-blind. Ciao, Dscho