The earliest time measurements were observations of cycles of the natural world, using patterns of changes from day to night and season to season to build calendars. More precise time-keeping eventually came along to put time in more convenient boxes. But what exactly are we measuring? Andrew Zimmerman Jones contemplates whether time is something that physically exists or is just in our heads. [TED-Ed Animation by Nice Shoes]. 

Andrew Zimmerman Jones: Does time exist?

Does time exist?

Einstein's theory of relativity unveiled time’s elasticity, showing it flows differently based on speed and gravity's pull.

The arrow of time, guided by the Second Law of Thermodynamics, propels us in one direction, from order to inevitable disorder.

Exploring time's essence, from ancient calendars to Einstein's relativity, questioning if time is fundamental or just perceived.