"Biochemistry." Gwen smiles, a little sheepish. She'll be the first to steel herself and defend any critique she receives on that front, but he seems kind and it makes her feel a bit dopey about that. Other girls are out having fun and enjoying the last weeks of high school, with next to nothing left to do, and she's flitting around a lab running errands. She wouldn't have it any other way. "All the chemical processes going on in living things."