John Hannigan, Wayne State University psychology professor, has been invited to give lectures about Dan Brown's controversial novel "The DaVinci Code," which will move to the big screen this week. Hannigan has been lecturing in Catholic parishes across Michigan debunking the book's historical flaws. He will also appear on the Catholic cable program "Dialogue" later this month. Hannigan says the novel is a fabrication, and that it's full of errors.