Until your comment and follow up reading of http://techland.time.com/2012/09/20/new-microsoft-keyboard-splits-space-bar-left-side-used-as-backspace-key/ http://

Until your comment and follow up reading of http://techland.time.com/2012/09/20/new-microsoft-keyboard-splits-space-bar-left-side-used-as-backspace-key/ http://techland.time.com/2012/09/20/new-microsoft-keyboard-s... I didn't even know what thumb I used to press space bar. Watching myself showed I'm using right hand's thumb almost always (like most people according to that article).