with more on this, alan jacobson thank you for coming on the show. great to have you.and more. >> it is a computer program that assigns reading level to text and is pervasive, used by every major educational publisher, in use in half the schools in the united states. gerri: if my kid is burning of books from schools, kutcher and the right, whenever it is, they have been assigned that reading level. chances are it was a computer program that decide whether this was appropriate. how does it make that decision? >> based on measuring word frequency and sentence length. keep in mind, it is not actually reading the word, so it does not know what it is reading. it is just using arithmetic. gerri: i want to give a couple of examples. for example, catcher in the right, i think i read it in high school. hey, that is great for grades three through four. >> because it is not actually reading the words. it is ironic. in the very first paragraph is the word prostitution. we don't want third graders even seeing that word, but it does not actually read the words. it measures sentence