It is commonly believed that we use only 10% of our brain; although that’s not true, according to wikipedia: http://en.wikipedia.org/wiki/Ten_percent_of_the_brain_myth.
However I believe this is true for computers, we truly use only an infirm part of our OS capacities. Which Windows user ever uses Insert, Ctrl + Alt + Arrow key (to rotate the screen), and so on? There are so many shortcut and applications already installed by default that I don’t know of. Today for instance, I discovered it’s possible to make a screenshot of only one part of the screen! Better, you barely need to use your mouse for that: open Snipping Tool (window key, start typing snipp.. when Snipping Tool is selected, press enter.. not even moved your fingers from the keyboard!) and use it to shoot a part of you screen.. you can even save from there or copy it to your Clipboard. That saved me so many PrtScn + Paint.net today!