If you use your computer often enough, you may be familiar with the feeling of making accidental mistakes on the keyboard, whether it be due to deleting a batch of text you didn’t mean to get rid of ...

On the Mac, you can always hit Command-Z to undo something. You can also hit Command-Shift-Z to redo something and put it back to what it was before you hit undo. Make sense? This isn’t so easily done ...