He wasn't pondering string theory, but instead, he was pondering...
"Why on earth am I such a fool?"
"To think that I would sit and listen for two hours straight – this chap's brainwashing powers are way too strong!"
"I'm even beginning to believe in string theory!"
"I must not entertain such thoughts!"
Zhao Yi forcefully shook his head, glanced at the time, and used the need to organize his thoughts as an excuse to arrange to meet Edward the next day.
If they were to continue talking, it would simply never end.
Edward seemed somewhat reluctant to part ways, but when he realized that Zhao Yi had listened attentively and seemed to have understood everything, he felt that he should indeed give Zhao Yi some time to digest everything.
Also, he was starting to feel tired.
"I'll come back tomorrow then."