Read More Skeptic What is time? Does the past still exist? How did the universe begin and how will it end? Do particles think? Was the universe made for us? Why doesn’t anyone ever get younger? Has physics ruled out free will? Will we ever have a theory of everything? To examine these ideas, Shermer speaks with Sabine Hossenfelder, a research fellow at the Frankfurt Institute for Advanced Studies, Germany. She has published more than eighty research articles about the foundations of physics, including quantum gravity, physics beyond the standard model, dark matter, and quantum foundations.