Have a wacky science question? Randall Munroe is here to help. The author of the science question-and-answer blog What If? and the popular web comic xkcd joins host Krys Boyd to discuss questions like: Could you cool the earth by opening freezer doors? And: Is it possible to build a billion-story building? His book full of answers is “What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions.”