Have you noticed that spaces between sentences are much narrower on the Web? Where there should be enough room for two spaces, there is only one space for majority of the web pages (I wouldn't be surprised if its 99%). This is due to a quirky rule in the HTML syntax that truncates contiguous whitespaces into a single space.

What amazes me is that most people don't notice or complain about it. If this happened in the real world, there would have been an uproar well before Evening Edition. My guess is that people are more willing to adapt in new environment.

By the way, UserLand Radio does put an extra space between sentences.  Above two paragraphs were handcoded in HTML to show how bad it would have been.  Great job, Dave!