+Before we move on to learning more Vimscript lets find a way to make it easier
+to add new mappings to our `~/.vimrc` file.
+When you're coding away furiously at a problem and realize a new mapping would
+make your life easier, you should add it to your `~/.vimrc` file right then and
+there to make sure you don't forget, but you *don't* want to lose your
+The idea is that you want to make it easier to make it easier to edit text.
+That's not a typo. Read it again.
+The idea is that you want to (make it easier to (make it easier to (edit
+Lets add a mapping that will open our `~/.vimrc` file in a split so we can edit
+it and get back to coding. Run this command:
+ :nnoremap <leader>ev <c-w>v:edit $MYVIMRC<cr>
+I like to think of this command as "**e**dit my **v**imrc file".
+`$MYVIMRC` is a special Vim variable that points to your `~/.vimrc` file. Don't
+worry about that for right now, just trust me that that variable works.
+Pressing `<c-w>v` in Vim opens a new vertical split. If you'd prefer
+a horizontal split replace the `v` with an `s`, but in this age of widescreen
+monitors I don't know why you would.
+Take a minute and think through that command in your mind. The goal is: "open
+my `~/.vimrc` file in a new split". Why does it work? Why is every single
+piece of that mapping necessary?
+With that mapping you can open up your `~/.vimrc` file with three keystrokes.
+Once you use it a few times it will burn its way into your muscle memory and
+take less than half a second to type.
+When you're in the middle of coding and come up with a new mapping that would
+save you time it's now trivial to add it to your `~/.vimrc` file.
+This is important because part of becoming more efficient is making it *easier*
+for yourself to become more efficient!
+Think of it this way: suppose you're trying to become a better digital
+photographer. When you're practicing taking photos and want to see how they
+* Upload it to your computer.
+* Open it and see how it looks.
+That process probably takes a minute. What if you could improve that?
+Let's say you invest $50 and buy an [Eye-Fi](http://www.eye.fi/) memory card.
+The Eye-Fi is a memory card for your camera that has a built-in wifi card, so as
+soon as you snap a photo it gets transferred to your computer.
+I know, we're definitely living in the future. Isn't it awesome?
+Now you spend an hour and write a little script to automatically open the photos
+that get transferred to your computer by the Eye-Fi.
+You've spent $50 and one hour, but now instead of taking a full minute to check
+your work, it takes ten seconds.
+Assuming you charge $100 per hour for freelance work, you've got to make up one
+an a half hours of time for this investment to be worthwhile. If you're saving
+50 seconds per photo, you need to take about 109 photos for project to pay for
+109 photos is *nothing*. It's a drop in the ocean. A blip that doesn't even
+register on the radar. You'd blow past that number in a day's practice without
+even noticing. Hell, you'd take more photos than that in two hours!
+The same goes for our new mapping. It saves us only a few seconds each time we
+use it, but it takes far, *far* less than an hour and a half to set up.
+Once you've added a mapping to your `~/.vimrc` file, it doesn't immediately take
+effect. Your `~/.vimrc` file is only read when you start Vim. This means you
+need to also run the command manually to make it work in the current session,
+Let's add a mapping to make this easier:
+ :nnoremap <leader>sv :source $MYVIMRC<cr>
+I like to think of this command as "**s**ource my **v**imrc file".
+The `source` command tells Vim to take the contents of the given file and
+execute it as Vimscript.
+Now we can easily add new mappings during the heat of coding. We:
+* Use `<leader>ev` to open the file.
+* Use `:wq` to write the file and close the split, bringing us back to where we
+* Use `<leader>sv` to source the file and make our changes take effect.
+That's six keystrokes plus whatever it takes to define the mapping. It's very
+little overhead, which reduces the chance that we break our concentration.
+Add mappings to "edit my `~/.vimrc`" and "source my `~/.vimrc`" to your
+Try them out a few times, adding dummy mappings each time.