Why does air conditioning seem to be more common in North America than in Europe or other places around the world? Adam looks at the many factors that can encourage or hinder adoption of AC in various places. Darren gives us book reviews on a variety of topics with "What Is Real? The Unfinished Quest for the Meaning of Quantum Physics" by Adam Becker and "Good and Real: Demystifying Paradoxes from Physics to Ethics" by Gary Drescher.