Here, Homer tells his father, point-blank, what he wants out of life, and Homer Sr. isn’t the least bit supportive (even though most fathers would presumably be thrilled to hear that their sons aspired to work for NASA!). Hickam also introduces a new complication here: von Braun isn’t the saint Homer thought he was. During the Third Reich in Germany, von Braun went on record saying that he despised the Jews, and his scientific work undoubtedly helped Hitler greatly. At the same time, he also worked alongside scientists whom he knew to be Jewish, and concealed their Judaism from the authorities—probably saving their lives. Either way, this revelation is an important reminder that science doesn’t exist in a vacuum—it is nearly always put to use for political purposes, some of them deeply immoral.