Theoretical cosmologist at Caltech, author and blogger Dr. Sean M. Carroll invited Matt and Andy to his Pasadena office this week to lend some insight into his areas of expertise, including: Being the house cosmologist on a paleontologogical dig! Dark matter! Defying what you thought you knew about the conservation of energy! The fixed density of dark energy! What happens a quadrillion years from now! Boltzmann brains! You might not have existed before this very instant! The arrow of time! Entropy! The second law of thermodynamics! We are the creamy tendrils in a universal cup of coffee! Consulting on movies like Thor and Tron: Legacy! Imposing boundaries on superheroes! Another blow to new age-y quantum BS! Multiple universes!