Signup for your FREE trial to The Great Courses Plus here: http://ow.ly/6ymM30rvhBa What do physicists mean when they talk about higher dimensional spaces, or space-times? How could we possibly not have noticed if space was not three-dimensional? In this first part, we will talk about the history of spaces with extra dimensions and how they became connected to dreams of unified theories, especially Kaluza-Klein theory, its achievements and its problems. Next week, we continue with the modern theories of additional dimensions of space. Part 2 is here: https://www.youtube.com/watch?v=UHZam0Zf1FQ You can support us on Patreon: https://www.patreon.com/Sabine #science #mathematics #physics 0:00 Intro 0:33 Higher Dimensional Geometry 4:37 Kaluza-Klein Theory 6:00 Predictions of Kaluza-Klein Theory 7:48 Problems with Kaluza-Klein Theory 8:42 Kaluza-Klein for all Forces 9:48 Sponsor Message