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 #7, "Quantum Mechanics." Mostly it's about the double-slit experiment, and why the wave function isn't just a cheap tool for calculating probabilities. But then at the end I get into the weeds a bit talking about the sense in which quantum states form a vector space. 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