Why did the Universe have such low entropy at the start? Are the laws of physics consistent across the multiverse? Can we see evidence of other regions of the multiverse? Sean Carroll discusses thermodynamics and the Universe. Subscribe for regular science videos: http://bit.ly/RiSubscRibe This is the 21st video in our advent series on thermodynamics. Watch them all here: http://www.rigb.org/christmas-lectures/supercharged-fuelling-the-future/thermodynamics-2016-advent-calendar?utm_source=youtube&utm_medium=social&utm_campaign=201612_channel_advent Sean Carroll is a theoretical physicist who thinks about the fundamental laws of nature, especially as they connect to cosmology. Visit his website: https://www.preposterousuniverse.com/blog/about-sean/ and watch his lectures on our channel: Black hole firewalls: https://www.youtube.com/watch?v=_8bhtEgB8Mo The particle at the end of the universe: https://www.youtube.com/watch?v=RwdY7Eqyguo The 2016 advent calendar explores the four laws of thermodynamics with a new short film each day, with explosive demonstrations, unique animations, and even a musical number. Open the calendar at http://www.rigb.org/christmas-lectures/supercharged-fuelling-the-future/thermodynamics-2016-advent-calendar?utm_source=youtube&utm_medium=social&utm_campaign=201612_channel_advent Subscribe for regular science videos: http://bit.ly/RiSubscRibe The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter