not sure. FYI, xkcd also makes (or made in 2008) it's money on merchandise. http://www.nytimes.com/2008/05/26/business/media/26link.html http://www.nytimes.co

not sure. FYI, xkcd also makes (or made in 2008) it's money on merchandise. http://www.nytimes.com/2008/05/26/business/media/26link.html http://www.nytimes.com/2008/05/26/business/media/26link.html “People are generally surprised that we make a living from it,” Mr. Munroe said. Without being specific, he said that the sales of xkcd merchandise support the two of them “reasonably well.” He said they sell thousands of T-shirts a month, either of panels from his strip or in their style, as well as posters.