Who the hell is Wile E. Coyote?
Update: I love the downvotes. Look at my username!
It's about the typeface. Back in the day of manual or electric typewriters, we had monospace fonts, meaning that every character had the same width. A lowercase "i" got the same horizontal width as an uppercase "M".
Now we have word processors and proportional fonts, and the spacing after a period is built into the typeface.
One space after a period is correct, unless you are using Courier (or similar).
Current and past presidents are prohibited from driving.