Sabine Hossenfelder talks about if the past exists, how the universe began and how it will end, information, math as reality, time, and consciousness. She also discusses her new book, Existential Physics: A Scientist’s Guide to Life’s Biggest Questions. Purchase a copy of Existential Physics: A Scientist’s Guide to Life’s Biggest Questions here. Sabine Hossenfelder is an author and theoretical physicist who researches quantum gravity. She is a Research Fellow at the Frankfurt Institute for Advanced Studies where she leads the Analog Systems for Gravity Duals group.