The earliest definitions of time-interval quantities were based on observed astronomical phenomena. Today's definition of time uses a combination of atomic and astronomical time. However, their ...

A new definition of time suggests that what we once thought was a fundamental element of our physical reality could actually just be an illusion created by quantum entanglement. That's a very bold ...

In this episode, the Nobel Prize-winning physicist Frank Wilczek speaks with host Steven Strogatz about the many “arrows” of time and why most of them seem irreversible, the essence of what a clock is ...