I was sitting in an all day meeting today at work (it was scintillating - thanks for asking), and while willing myself to stay awake, I began to notice things that would otherwise go unnoticed. Gazing at my keyboard with the same intensity as if I had never seen one before, I noticed a dull spot on the shiny keys. Thinking it might be a stain (perhaps a dried drop of soda from lunch - with extra caffeine - to help my eyes stay open), I tried to rub it, but it did not go away.
Apparently I only use my right thumb on the space bar. I have worn a tiny spot on the lacquer from my single sided spacing. Of course I have done all sorts of typing testing since I made this earth-shattering observation. My left thumb does no work at all when typing. It just sits there, waving around in midair - as if it wants to hitchhike to another activity as soon as a friendly passer-by will stop and pick it up.
So, I guess I will have to resign from my proud title of "ten finger typer" and reduce my status to "nine finger typer" - which is still better than the hunt and peck method some people employ (ahem, dad).