A Not-Yet-Permanent Damage

Looking through the courses I've taken over the past few years, suddenly, I feel a deep worry. It is as if something is missing, but I couldn't locate the source. But, well, what could go wrong? Indeed, I've learn so much from diverse disciplines, in politics, economics, history, philosophy, logic, law, anthropology, biology, geology, and physics.

Until these words in Darwin’s autobiography reminded me of what is missing: