Tip - writing for maximum reader comprehension

Today I read a post entitled "Serif vs. sans-serif legibility" on a blog which claims to be a "Blog about web design & development". (I have removed the link to the blog as a favour to the blog author after his comment below, since this post is critical of the material posted).

The post had been referred to in Hacker News - one of the feed combinators that I subscribe to in my Google Reader.
The post caught my eye because it was on a topic that interested me and on which there is quite a large and solid body of scientific research and knowledge, and I wondered if the post added anything to that body of knowledge. Disappointingly, it did not, because it was a superficial, elementary and unscientific look at the subject by someone who clearly seemed to be ignorant of that body of knowledge and of either human psychology or especially of human visual perception - the latter two factors being what I would have hoped might have been burned-in to the skull of anyone involved in "web design & development". Maybe modern educational standards just don't cut the mustard.