The Biggest Ideas in the Universe | 5. Time

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 #5, "Time." We talk about what time is, whether it's "real," and about why it seems to move in just one direction. That gets us a bit into entropy, which is a teaser for a later video in the series. My web page: http://www.preposterousuniverse.com/ My YouTube channel:    / seancarroll   Mindscape podcast: http://www.preposterousuniverse.com/p... The Biggest Ideas playlist:    • The Biggest Ideas in the Universe: Introdu...   Blog posts for the series: http://www.preposterousuniverse.com/b... Background image: https://commons.wikimedia.org/wiki/Fi... #science #physics #ideas #universe #learning #cosmology #philosophy #math #time