Fans of George R.R. Martin's "A Song of Ice and Fire," adapted by HBO as Game of Thrones , already know the novels inside and out. I go behind the scenes to offer 10 secrets from the HBO drama, launching April 17. Over at The Daily Beast, you can read my latest feature (which is for the die-hard fans of the novels as well as those looking for some behind-the-scenes details about the HBO production), entitled " Game of Thrones : 10 Secrets About HBO's Adaptation," in which I speak to George R.R. Martin, David Benioff, D.B. Weiss, Dothraki language developer David Peterson (and get an exclusive translation of a key phrase), weapons master Tommy Dunne, set designer Gemma Jackson, head animal trainer Jim Warren, HBO entertainment president Sue Naegle, Nikolaj Coster-Waldau, set decorator Richard Roberts, and supervising prop maker Gavin Jones. Among the topics discussed: Martin's unseen cameo from the original pilot, the crystal blade that the White Walkers