Why does time advance? Richard Muller's new theory

A simple question from his wife – Does physics really allow people to travel back in time? – propelled physicist Richard Muller on a quest to resolve a fundamental problem that had puzzled him throughout his 45-year career: Why does the arrow of time flow inexorably toward the future, constantly creating new "nows"? Click here to learn more.

Provided by the University of California, Berkeley

Runtime: 3:33

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