So who is Nagarjuna, and why do people call him the Second Buddha?

Mm-hmm.

Yeah, so Nagarjuna lived in the s- first or second century of the Common Era.

Um, we don't know exactly when.

Um, he was an Indian Buddhist monk, probably from southern India.

Um, and that is as much as we know in kind of hard facts about his biography.

Um, what we know more about are his works and how influential they were.

Sure.