The Biggest Ideas in the Universe is a series of videos where I talk informally about some of the fundamental concepts that help us understand our natural world. Exceedingly casual, not overly polished, and meant for absolutely everybody. This is Idea #20, "Entropy and Information." The increase of entropy over time is responsible for the difference between past and future, and is thus in a very real sense the most important thing in the universe. We talk about how this works and what it has to do with the concept of information. My web page: http://www.preposterousuniverse.com/ My YouTube channel: https://www.youtube.com/c/seancarroll Mindscape podcast: http://www.preposterousuniverse.com/podcast The Biggest Ideas playlist: https://www.youtube.com/playlist?list=PLrxfgDEc2NxZJcWcrxH3jyjUUrJlnoyzX Blog posts for the series: http://www.preposterousuniverse.com/blog/category/biggest-ideas-in-the-universe/ Background image: https://www.pxfuel.com/en/free-photo-xhzcr #science #physics #ideas #universe #learning #cosmology #philosophy #entropy #information