Making Paragraphs With Vim

E-books from Project Gutenberg are broken into 70-character lines. Fixed length lines can be hard to read on a mobile phone, so I wanted to let the phone's viewer break the lines and use only a blank line between paragraphs. Here's some text from Arthur Conan Doyle's A Scandal in Bohemia originally fro Project Gutenberg:

"Wedlock suits you," he remarked. "I think, Watson, that you have
put on seven and a half pounds since I saw you."

"Seven!" I answered.

"Indeed, I should have thought a little more. Just a trifle more,
I fancy, Watson. And in practice again, I observe. You did not
tell me that you intended to go into harness."

Below is how this text should become (paste the before and after text into your text editor to see the difference):

"Wedlock suits you," he remarked. "I think, Watson, that you have put on seven and a half pounds since I saw you."

"Seven!" I answered.

"Indeed, I should have thought a little more. Just a trifle more, I fancy, Watson. And in practice again, I observe. You did not tell me that you intended to go into harness."

The following command in Vim did the required conversion: %s/\(.\)\n\(.\)/\1 \2/. Basically, for every line, replace any new line character between any two characters with a whitespace.