She tried to look behind them, surprised that they were still trailing them. The sight made her grimace a little. "Not too far, please. I didn't want to take them too far from the library. You remember when Tony got on the train?"

Alchemy was not a word she'd heard of, and it was quite clear that the name of Isaac Newton rang no specific bells either, space or no. She made a little face at Iron Man's attempt at an explanation, but she could get the general idea. "So...is it like some kind of genetic alteration?" That angle she could understand a bit more if they were talking science.