What are sub-books?
I think it just means “two books”. (A previous round of HPMOR Author’s Notes referred to “my nonfiction rationality book which seems to have turned into two books actually”, and refers to “the books” for the rest of the paragraph.)
I think it just means “two books”. (A previous round of HPMOR Author’s Notes referred to “my nonfiction rationality book which seems to have turned into two books actually”, and refers to “the books” for the rest of the paragraph.)