A little humor here and there - Part 2

Some fun textbook fails. And since the majority of them are math textbooks, I feel even better about them (as math hates me, and the feeling is certainly mutual).

http://www.huffingtonpost.com/2012/04/09/21-hilarious-textbook-fails-photos_n_1408451.html?ref=comedy#s848588&title=Also_On_The