The other man tilts his head thoughtfully. If one were to look into his eyes they would seem oddly old for such a young looking face almost like he'd seen too much in his life to be his actual age. Then against given he is dressed in the uniform of a soldier that might make sense to the man speaking to him. "That book is the word of one man," Jack points out quietly, "based on his observations yes, but there may need to be more testing to fill in the blanks. That is how scientific theory works is it not?"