[ Iiiiinteresting. How can he not greet the girl asking about theoretical physics with a smile? ]

The library seems to not quite function the way we'd expect - it has some kind of reaction to what we're thinking, and focusing on. Has to be something monitoring our neural patterns.

[ Luckily - ]

But, I did find it before. I focused on it for a few moments, then... let my thoughts wander, naturally, until they latched onto something else, focused on that, and... physics.

[ He smirks. ]

It took a little trial and error.