Like Rachel said, I usually sell those books. But in my Clan Douglas Dynasty, I kept some of them and a book from an Athletic career opportunity wound up being my founder's favourite book. When I sent him to the bookcase to "read something," he almost always chose that book to read, even though there were a lot of other books, many of which he hadn't read at all. Which makes me wonder - how do sims choose what to read? The dynasty was the first time I've ever played a multi-generational family, and I did notice that most of the readers seemed to have favourite books they'd read over and over. One of them liked to read the pregnancy book. I wonder what makes a particular book a favourite.