I used to do one. But I realized recently I didn’t have a real reason why. Just because we read one at a time in school? In school I could pay attention to more than one subject at once so I can read more than one book at once.

To answer the question 4right now: mason and Dixon, moby dick, the sun also rises, and the odyssey (Fagles translation).

It’s not like I’m on a time limit so if I read four at once I’ll just read slower, but there’s no problem with that.