What is time, and why does it seem to flow in only one direction? This video explores modern physics’ take on time—from the Block Universe interpretation of relativity to the role of entropy in ...

Albert Einstein’s theory of general relativity is packed with weird insights about our reality, but perhaps the most mind-boggling is the fact that strong gravitational fields or incredibly high ...

Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom.