Earlier quoted context omitted.
Does HN truncate double spaces? Testing this now. Otherwise I'm only picking up one space after your sentences. Edit: Looks like it does. Yay PG! Edit2: Looks like I forgot some basics of HTML. My 14 year old self would be very disappointed.
The HTML rendering engine in your browser actually consolidates each block of white space into a single visible space character. If you view source, there are two spaces there. So, there's a good reason not to use two spaces, as the web will only show the one.
Is there a good reason the browser messes up my spacing? Certainly not for readability!