Never too much attention for one of our giants: Douglas Engelbart.
“If you are looking at a computer screen, your right hand is probably resting on a mouse. To the left of that mouse (or above, if you’re on a laptop) is your keyboard. As you work on the computer, your right hand moves back and forth from keyboard to mouse. You can’t do everything you need to do on a computer without constantly moving between input devices. There is another way.”