Given that the engineer was apparently satisfied with his answer, he allowed himself to relax a bit and was prepared to ignore Stark's comment--he was obviously American, even if he knew Russian, and he didn't really know what a Nazi was exactly--but he paused as he began to realize something. For a moment he frowned slightly to himself, not out of confusion but curiosity, and he looked over to Steve again.

"Today is your birthday." He'd read it on the exhibit. It seemed like an interesting coincidence.