Students are asked to explore several concepts pertaining to electron-electron interaction through the KS-DFT method in the worksheet when arriving at this point. One question asks them to consider how the description of exchange and correlation as 'nature's chemical glue' 70 makes sense given the signs of the decomposed energy terms from the output of the converged SCF cycle. The ability to switch off exchange, correlation, or Hartree energy-a capability not usually present in ready-made software-exists here through an ipywidget tool and can produce insights into this phrase. Other questions address how the PIB model differs from both an idealized uniform electron gas and a real molecular system.