Responses
Kana is correct basically. It's not particularly science but enjoying each other's intelligence. It would have been similar if they applied their brains to say, battle tactics for example, though when talking about pure scientific theory they do get particularly hot and bothered but only with each other
Am I the only one who dont get it, why they kiss after only explaining some scientific echuchu? In the heat of the moment?? (〜 ̄△ ̄)〜