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 the Q&A video associated with Idea #8, "Entanglement." Using spins as a model system, I try to explain why entanglement is much more subtle than classical correlations (as in gloves or socks). And I talk a bit more about Many Worlds and the origin of probability. 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://woowpaper.blogspot.com/2020/02/ultra-hd-3d-wallpaper-blue.html #science #physics #ideas #universe #learning #cosmology #philosophy #quantum