He was really excited about chi! Just something I overheard on the subway on the way back from an excursion into the city. Public transit is good for listening in on other peoples' conversations, often whether you want to or not. But I usually want to - sometimes I get a good quote for dialogue or some insight into a group of people (like Wall St).
I should mention that Yuko drew this comic despite being sick - thank you! There are beads of sweat in this ink!! A testament to her grit and dedication.