Laura Mersini-Houghton

"If gravity is a fundamental force, then it has to be explained by an expanded version of general relativity, a more complete, a more fundamental theory. Whether that is quantum gravity of something more radical that requires a paradigm shift like, for instance, our research in multiverse theory, nobody knows at the moment."

"You can vary Newton's constant and the fine-structure constant, which is responsible for the strength of electromagnetic interactions ... by six orders of magnitude, by thousands, and still get a universe that allows for life."