In everyday life, and in science, we assume that effect follows cause. But could this most basic of beliefs be mistaken? In the “block universe” postulated by theoretical physics, there is no before and after. Is the arrow of time an illusion and causality a fiction, or is the science simply wrong?

In this video, quantum physicist Lev Vaidman, cosmologist George Ellis, and philosopher of physics James Ladyman investigate causality.

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