Although time may not materially exist, most of us still measure it out using clocks and calendars. From the creation of days to the atomic clock, this episode explores how the abstract concept of time became a countable “reality” — and why metric time worked its way to the heart of Western society. This episode in brief: 1. Mapping calendrical time | 03:15 The countable time we use in our everyday life is a social construction. This section takes a look at how different cultures divided the...