Does it have to be specifically on an identified paper or thesis? Does it have to be science in the strictest sense? If not, what qualifies? Maths? Physics

Does it have to be specifically on an identified paper or thesis? Does it have to be science in the strictest sense? If not, what qualifies? Maths? Physics with a philosophical side to it? Do talks about how to give scientific talks count (if they are good talks in themselves)? TED talks that are not superficial? Answers to those would help define your conceptual category, but as it happens each of them corresponds to a particular talk I have in mind.