5 November 2015 - Now I Know

"Bonus Fact: Bill Watterson, the creator of comic strip Calvin and Hobbes, almost never licenses his characters for commercial use. One exception, though, came in 1993, when a special education teacher wrote to him to tell him that her students found Watterson’s characters engaging and asked him to license a textbook for her and others to use. He agreed, “Teaching with Calvin and Hobbes” entered a limited print run. Because the print run was so small and because Watterson doesn’t often authorize licensed product, the book is now very expensive, even for a textbook."

http://nowiknow.com/why-texas-may-decide-what-your-child-learns/