Take a look at a keyboard, and the unusual way it is set out. The QWERTY layout, as it is known, was devised in the early days of mechanical typewriters, to avoid the jamming of the arms that were thrown to strike the ribbon with the paper underneath. It was designed to slow the user down. I was a printer many years ago, not the type you see now with computers and desktop publishing, but the old-fashioned way, with hot metal type.