EDIT:
I'm getting downvoted so I'll provide some explanation.
The first paragraph (excluding the last line) has 107.8 characters/line (including spaces).
"Anything from 45 to 75 characters is widely regarded as a satisfactory length"
Personally, while I enjoyed this pdf, it could have been a bit more pleasant to read.
EDIT:
I'm getting downvoted so I'll provide some explanation.
The first paragraph (excluding the last line) has 107.8 characters/line (including spaces).
"Anything from 45 to 75 characters is widely regarded as a satisfactory length"
Personally, while I enjoyed this pdf, it could have been a bit more pleasant to read.