The woman who is performing the experiment is a graduate student. She is performing these tasks for the first time, on her own without instructions, and the older woman in the back is her supervisor. This young lady is trying to not show how nervous she is, and to be impressive, considering this is an occupation she hopes to keep. She has worked hard all throughout her college career to get here and although she is anxious, she keeps her composure and performs the desired tasks without flaw. The older woman never removes her eyes from this young lady. Although she is kind hearted, she cannot show this during work. She maintains stern facial expressions purposely to see how they young woman will do under pressure. She approves of the graduate students work and offers her a full time job in the lab. 
