I'm posting this in the general d/l discussion forum because it concerns the Cleveland Institute of Electronics even though it has nothing to do with actual distance learning. So sue me. I took a career diploma and an AAS by correspondence from CIE shortly after the war. (Which war? I ain't sayin'.) Some months ago I saw on ebay a special CIE edition aluminum Pickett "electronics" slide rule. It has special scales for doing some routine but specialized radio related calculations. I bought it because of course I did. All through High School science classes and such hard science as I took in college, I used, we all used, slide rules. Playing with this one now reminds me just how quick a slide rule can be. So a question...who all ever used a slipstick? Which brand did you prefer? Do you still know how? Pilots maybe shouldn't count because they all use a pilot's version but I guess we'll listen to them anyway. You iPhone toting youngsters might scoff and sneer but we sent men to the moon using slide rules!