It's a blog! Mainly of book reviews.
I've never found an XKCD cartoon in a formal textbook before!
Fascinating discussion of the information of letters in English; the informational entropy of Romeo and Juliet is approx. 4.12 bits/letter. The correlation length of blocks of English text is 10 letters (including a space). No account seems to be taken of punctuation or upper vs. lower case in this discussion.