 What is implied when the narrator describes Nelson’s light colored hair?
With him came a boatload of scientific apparatus and equipment, including a number of things that looked like oxygen tanks, which were now stored in the forward hold. Overhead, the sky was a storm-racked mass of clouds, broken in one spot by a tiny patch of starlit blue. It was Nelson, his shaggy blond brows drawn scowlingly down over his pale eyes; his thin face a mass of tense lines; his big hands fumbling at the neck of his slicker. Rain was coursing down his white cheeks, streaking them with glistening furrows. Nevertheless, his taut face, restless, searching eyes, and eternally nervous manner got Curtis' goat. Nelson shouldered his way inside, and stood there in his dripping oilskins, blinking his eyes against the yellow light. Nelson had no answering smile, although there had been a great deal of good-natured joking aboard the Comerford ever since the navy department had sent the scientist on board the cruiser to carry on his experiments. This storm—" Curtis threw his arm around Nelson's dripping shoulders. "But this storm, sir!" Nelson avoided Curtis' friendly eyes and slipped out from under his arm. In a few minutes he returned and handed Nelson a sheet of paper with figures underlined heavily. Nelson's estimate, I'm checking back," he declared, frowning at the two papers and hastily rechecking his own figures. With all these rocks and islets—" "Radio?" repeated the little Czech, thrusting his face between the other two, in his independent fashion that ignored ship's discipline. Then he hastened to the radio room, with Nelson at his heels, and the Czech trotting along behind. I have shattered them around your ship, just as I can eventually shatter them all over Central Europe! For the next two hours, no radio messages can enter or leave my zone of radio silence—of refracted radio waves, set up by my little station on one of the neighboring islets!" The answer came back: "Bearings north east by a quarter east, U. S. Cruiser Comerford !" He saw that Nelson was staring fiercely at the radio operator, as the man went on calling: "U. S. Cruiser Comerford calling Station 364. Bearings north west by three west, U. S. Cruiser Comerford from Cay 364." "I'm relieved, sir, just the same," Nelson admitted, "to have the radio bearings. Tubes lighted; wires were alive to the touch and set him to shaking his head at the tingle they sent through his inquiring fingers.
 Nelson is German by ancestry, raised sympathetic to Germany’s cause.
 Nelson is German by ancestry, raised sympathetic to Germany’s cause.  Nelson is German by ancestry, but was raised on the side of the American effort.  Curtis is prejudiced against people with light hair.  Nelson is Czech