Why are we here? Is there a God? A reason to it all? How, and why, did the universe begin, and how, and why, will it end? Sean M. Carroll, a cosmologist and physicist specializing in dark energy and general relativity, joins Nick to answer the questions that plague us all, including, if there's a chance that somewhere out there in the cosmos, there is another extraterrestrial Donald Trump ruling over a planet of little green aliens.