Episode notes
I read from exchange to excitable.
The chess board thing makes sense! Exchequer "...refers to a cloth divided in squares that covered a table...and which reminded people of a chess board."
https://www.etymonline.com/word/exchequer#etymonline_v_14027
The word of the episode is "excimer laser".
https://en.wikipedia.org/wiki/Excimer_laser
Theme music from Tom Maslowski
Merchandising!