Karl only smiled further, looking between Sapnap and the notes on screen while still jotting them down in his journal. "Geez, do you want us to get in trouble? Go back to taking your notes," He lightheartedly scolded, only half-meaning what he had softly hissed out, softly nudging Sapnap away with the quietest of giggles. He didn't want either of them to get in trouble for disrupting the class, so he tucked the conversation to the side for the time being, though he did have an answer for Sapnap's question. Karl grabbed at the paper the two had passed between each other, writing something else onto it with decorative calligraphy, quietly sliding it back in Sapnap's direction. Of course, he took the opportunity to make it yet another chemistry-themed reply, happy to support Sapnap's major even in silly ways such as he did. "Deuterium, Uranium, and Hydrogen; DUH, you nimrod."