Read for your end of rotation exam.
When he asks you if you found the answer: "I read for 2 and a half hours last night, and I just can't find it. But I did learn something cool about <related topic="">."
Just stop there, and let him bloviate and riff off that. He may give you more dumb questions, in which case you rinse and repeat.
For you, you get to read and prepare for your exam without wasting time researching crap that you'll never need to know. For him, he gets to be smart and feel like he's inspiring you to read. Win/win.</related>