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\subsubsection{In-class exercises}  Rather than communicating crucial content via lecture during the lab period, short in-class exercises are used to refresh and deepen understanding of concepts introduced in the lecture portion of the course. These in-class exercises are meant to stimulate discussion and questions in lab groups, with the goal of scaffolding concepts that will be needed for the next lab, or reviewing particularly difficult concepts from last week's lab (Fig.\ \ref{fig:inclass_lab} contains an example). Instructors circulate around the room and answer questions as they arise. After 20--30 minutes, students write down their conclusions and turn submit  their in-class exercises in. exercises.  In-class exercises only compose a tiny portion of the grade and are only assessed for effort, but this assessment ensures students engage with the material.