My mother couldn't drive a horse and buggy - but my grandmother could. I can't waltz or swing dance, but my mother could. She never did get a MAC machine or pumping her own gas. Is any of us stupid? No, of course not. Times are changing and we don't have to learn things we can do another way - like telling time. You wouldn't say 20 cents less than $2, would you? You'd say $1.80. Same thing.