Researched and Written by Leila Battison Narrated and Edited by David Kelly Thumbnail Art by Ettore Mazza If you like our videos, check out Leila's Youtube channel: https://www.youtube.com/channel/UCXIk7euOGq6jkptjTzEz5kQ Music from Silver Maple, Epidemic Sound and Artlist. Stock footage from Videoblocks. References: https://www.wired.com/2010/02/what-is-time/ https://www.nature.com/articles/d41586-018-04558-7 https://www.cornell.edu/video/leonard-susskind-1-boltzmann-and-the-arrow-of-time http://www.preposterousuniverse.com/blog/2008/12/29/richard-feynman-on-boltzmann-brains/ https://www.newscientist.com/article/mg23331133-200-universes-that-spawn-cosmic-brains-should-go-on-the-scrapheap/ https://www.newscientist.com/article/mg21829184-400-string-theory-may-limit-space-brain-threat/ https://www.forbes.com/sites/startswithabang/2017/04/15/ask-ethan-what-was-the-entropy-of-the-universe-at-the-big-bang/?sh=7a9c81287280 https://www.edge.org/response-detail/25538 http://homepages.wmich.edu/~korista/hawking-time.html https://www.britannica.com/biography/Saint-Augustine http://web.mnstate.edu/gracyk/courses/web%20publishing/AugustineBookXI.htm https://www.informationphilosopher.com/problems/arrow_of_time/ https://blogs.futura-sciences.com/e-luminet/2016/01/16/warped-science-interstellar-46-time-dilation-penrose-process/ https://mathshistory.st-andrews.ac.uk/Biographies/Boltzmann/ Image credits: Sundial Kew Gardens By Matěj Baťha - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=24722359 Arthur Eddington and Einstein By H. van Batenburg - Leiden Archives, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31680341 Three Body Problem GIF By Dnttllthmmnm - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=59538221 Graz By Mfield, Matthew Field, http://www.photography.mattfield.com/ - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4244557 00:00 Introduction 03:55 What Is Time? 09:05 The Arrow Of Time 17:11 The Beginning Of Time 21:56 The End Of Time