This week, Jillian has a lot of questions for theoretical physicist and mathematician Brian Greene:l Is the universe infinite? What is the most probable multiverse? Are there copies of us out there? What about the Fermi Paradox, are we alone? They tackle some of Jillian's other favorite topics as well, including parallel universes, The Double Slit Experiment, Quantum Mechanics, the nature of time, free will, alternate realities, black holes and so much more…  Guest Link: https://www.worldsciencefestival.com Start your FREE 7 day trial for Jillian’s App at https://go.jillianmichaels.com/WNt1rL7uyZ Send us your brief question at [email protected] Follow us on Instagram @JillianMichaels and @MartiniCindy This Week’s Sponsors: TRUNIAGEN.com, promo code JILLIAN for $20 off a 3-month supply SKILLSHARE.com/JILLIAN, for a free trial of Premium Membership BROOKLINEN.com, promo code JILLIAN for $25 off orders over $100, + free shipping THIRDLOVE.com/JILLIAN for 20% off your first order You can find new episodes of Keeping It Real: Conversations with Jillian Michaels, completely ad free, on Wondery+ https://wondery.app.link/jillian